pkg/report: add tests for rcu stalls in kmem_cache_alloc

I though maybe we need special handling for them: stop at kmem_cache_alloc function. But now I am not sure. This can also be an infinite loop which calls kmalloc/kfree. Let's not change code for now, just fix things with tests (this is a good representative set).
author: Dmitry Vyukov <dvyukov@google.com> 2020-06-02 17:46:27 +0200
committer: Dmitry Vyukov <dvyukov@google.com> 2020-06-02 17:47:56 +0200
commit: 06417ff86899b45658b5c02e3a329ee747717498 (patch)
tree: 18a0338edf1a152a9c20a16126fe7d8ab096c4c1 /pkg
parent: c98aaf984a8f6f5af4dd2601ec735bf4d9df34b4 (diff)
9 files changed, 1454 insertions, 0 deletions
diff --git a/pkg/report/testdata/linux/report/487 b/pkg/report/testdata/linux/report/487
new file mode 100644
index 000000000..5dd962307
--- /dev/null
+++ b/pkg/report/testdata/linux/report/487
@@ -0,0 +1,79 @@
+TITLE: INFO: rcu detected stall in batadv_mcast_get_bridge
+TYPE: HANG
+
+[  463.512820][   T27] audit: type=1326 audit(1589206749.923:16): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=16576 comm="syz-executor.5" exe="/root/syz-executor.5" sig=9 arch=c000003e syscall=228 compat=0 ip=0x45f66a code=0x0
+[  568.528728][    C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
+[  568.535895][    C1] rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P282
+[  568.543518][    C1] 	(detected by 1, t=10503 jiffies, g=61629, q=41)
+[  568.550540][    C1] kworker/u4:6    R  running task    24784   282      2 0x80004000
+[  568.558788][    C1] Workqueue: bat_events batadv_mcast_mla_update
+[  568.565112][    C1] Call Trace:
+[  568.568513][    C1]  ? __schedule+0x937/0x1ff0
+[  568.573122][    C1]  ? __sched_text_start+0x8/0x8
+[  568.578018][    C1]  ? __this_cpu_preempt_check+0x28/0x190
+[  568.583702][    C1]  ? smp_apic_timer_interrupt+0x1b6/0x600
+[  568.589452][    C1]  ? preempt_schedule_thunk+0x16/0x18
+[  568.594819][    C1]  ? preempt_schedule_common+0x4a/0xc0
+[  568.600299][    C1]  ? preempt_schedule_thunk+0x16/0x18
+[  568.605777][    C1]  ? unwind_next_frame+0x1073/0x1df0
+[  568.611146][    C1]  ? stack_trace_save+0x8c/0xc0
+[  568.616003][    C1]  ? deref_stack_reg+0xe0/0xe0
+[  568.620810][    C1]  ? mark_lock+0x12b/0xf10
+[  568.625230][    C1]  ? profile_setup.cold+0xc1/0xc1
+[  568.630712][    C1]  ? arch_stack_walk+0x81/0xf0
+[  568.635521][    C1]  ? save_stack+0x1b/0x40
+[  568.639855][    C1]  ? stack_trace_save+0x8c/0xc0
+[  568.648620][    C1]  ? stack_trace_consume_entry+0x160/0x160
+[  568.654579][    C1]  ? print_usage_bug+0x240/0x240
+[  568.659531][    C1]  ? print_usage_bug+0x240/0x240
+[  568.664469][    C1]  ? save_stack+0x1b/0x40
+[  568.668810][    C1]  ? __lock_acquire+0xcbb/0x4c50
+[  568.673764][    C1]  ? mark_held_locks+0xe0/0xe0
+[  568.678526][    C1]  ? mark_held_locks+0xe0/0xe0
+[  568.683295][    C1]  ? mark_lock+0x12b/0xf10
+[  568.687722][    C1]  ? print_usage_bug+0x240/0x240
+[  568.692668][    C1]  ? lock_acquire+0x1f2/0x8f0
+[  568.697354][    C1]  ? kasan_unpoison_shadow+0x30/0x40
+[  568.702643][    C1]  ? __kasan_kmalloc.constprop.0+0xbf/0xd0
+[  568.708445][    C1]  ? kmem_cache_alloc_trace+0x295/0x7d0
+[  568.713993][    C1]  ? kmem_cache_alloc_trace+0x13d/0x7d0
+[  568.719639][    C1]  ? rcu_read_lock_held+0x9c/0xb0
+[  568.724665][    C1]  ? rcu_read_lock_held_common+0x130/0x130
+[  568.730484][    C1]  ? batadv_mcast_mla_update+0x1ce2/0x2d20
+[  568.736305][    C1]  ? lock_acquire+0x1f2/0x8f0
+[  568.741009][    C1]  ? batadv_mcast_get_bridge+0x200/0x200
+[  568.746660][    C1]  ? rcu_read_lock_sched_held+0x9c/0xd0
+[  568.752205][    C1]  ? rcu_read_lock_any_held.part.0+0x50/0x50
+[  568.758190][    C1]  ? _raw_spin_unlock_irq+0x1f/0x80
+[  568.763484][    C1]  ? process_one_work+0x965/0x16a0
+[  568.768607][    C1]  ? lock_release+0x800/0x800
+[  568.773327][    C1]  ? pwq_dec_nr_in_flight+0x310/0x310
+[  568.778699][    C1]  ? rwlock_bug.part.0+0x90/0x90
+[  568.783646][    C1]  ? worker_thread+0x96/0xe20
+[  568.788353][    C1]  ? process_one_work+0x16a0/0x16a0
+[  568.793621][    C1]  ? kthread+0x388/0x470
+[  568.797864][    C1]  ? kthread_mod_delayed_work+0x1a0/0x1a0
+[  568.803619][    C1]  ? ret_from_fork+0x24/0x30
+[  568.808239][    C1] rcu: rcu_preempt kthread starved for 10527 jiffies! g61629 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
+[  568.819430][    C1] rcu: RCU grace-period kthread stack dump:
+[  568.825314][    C1] rcu_preempt     R  running task    28440    10      2 0x80004000
+[  568.833214][    C1] Call Trace:
+[  568.836513][    C1]  ? __schedule+0x937/0x1ff0
+[  568.841112][    C1]  ? __sched_text_start+0x8/0x8
+[  568.846051][    C1]  ? _raw_spin_lock_irqsave+0x94/0xbf
+[  568.851416][    C1]  ? debug_smp_processor_id+0x2f/0x185
+[  568.856876][    C1]  ? schedule+0xd0/0x2a0
+[  568.861123][    C1]  ? schedule_timeout+0x35c/0x850
+[  568.866153][    C1]  ? usleep_range+0x160/0x160
+[  568.870831][    C1]  ? _raw_spin_unlock_irqrestore+0x62/0xe0
+[  568.876650][    C1]  ? __next_timer_interrupt+0x190/0x190
+[  568.882285][    C1]  ? prepare_to_swait_exclusive+0x110/0x110
+[  568.888191][    C1]  ? rcu_gp_kthread+0x9bf/0x1960
+[  568.893135][    C1]  ? rcu_barrier+0x4b0/0x4b0
+[  568.897729][    C1]  ? _raw_spin_unlock_irqrestore+0x62/0xe0
+[  568.903536][    C1]  ? lockdep_hardirqs_on+0x463/0x620
+[  568.908821][    C1]  ? __kthread_parkme+0x13f/0x1e0
+[  568.913841][    C1]  ? rcu_barrier+0x4b0/0x4b0
+[  568.918441][    C1]  ? kthread+0x388/0x470
+[  568.922701][    C1]  ? kthread_mod_delayed_work+0x1a0/0x1a0
+[  568.928441][    C1]  ? ret_from_fork+0x24/0x30
diff --git a/pkg/report/testdata/linux/report/488 b/pkg/report/testdata/linux/report/488
new file mode 100644
index 000000000..efcafc753
--- /dev/null
+++ b/pkg/report/testdata/linux/report/488
@@ -0,0 +1,142 @@
+TITLE: INFO: rcu detected stall in garp_join_timer_arm
+TYPE: HANG
+
+[ 1829.205943] rcu: INFO: rcu_preempt self-detected stall on CPU
+[ 1829.212313] rcu: 	1-...!: (1 GPs behind) idle=b46/1/0x4000000000000004 softirq=214004/214006 fqs=37 
+[ 1829.222342] rcu: 	 (t=10500 jiffies g=285169 q=488)
+[ 1829.227375] rcu: rcu_preempt kthread starved for 10424 jiffies! g285169 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
+[ 1829.237940] rcu: RCU grace-period kthread stack dump:
+[ 1829.243121] rcu_preempt     R  running task    29136    10      2 0x80000000
+[ 1829.250317] Call Trace:
+[ 1829.252918]  ? __schedule+0x866/0x1d80
+[ 1829.256808]  ? schedule_timeout+0x4c3/0xf20
+[ 1829.261133]  ? firmware_map_remove+0x19a/0x19a
+[ 1829.265718]  ? _raw_spin_unlock_irqrestore+0x67/0xe0
+[ 1829.270827]  schedule+0x8d/0x1b0
+[ 1829.274191]  schedule_timeout+0x4d1/0xf20
+[ 1829.278340]  ? usleep_range+0x160/0x160
+[ 1829.282318]  ? __next_timer_interrupt+0x190/0x190
+[ 1829.287174]  ? prepare_to_swait_exclusive+0x110/0x110
+[ 1829.292370]  rcu_gp_kthread+0xcee/0x2060
+[ 1829.296457]  ? rcu_blocking_is_gp+0x90/0x90
+[ 1829.300781]  ? _raw_spin_unlock_irqrestore+0x67/0xe0
+[ 1829.305883]  ? lockdep_hardirqs_on+0x40b/0x5d0
+[ 1829.310463]  ? _raw_spin_unlock_irqrestore+0xa0/0xe0
+[ 1829.315564]  ? __kthread_parkme+0xfd/0x1b0
+[ 1829.319796]  ? rcu_blocking_is_gp+0x90/0x90
+[ 1829.324120]  kthread+0x34a/0x420
+[ 1829.327486]  ? kthread_cancel_delayed_work_sync+0x20/0x20
+[ 1829.333134]  ret_from_fork+0x24/0x30
+[ 1829.336873] NMI backtrace for cpu 1
+[ 1829.340499] CPU: 1 PID: 23826 Comm: syz-executor.4 Not tainted 4.19.120-syzkaller #0
+[ 1829.348372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[ 1829.357723] Call Trace:
+[ 1829.360298]  <IRQ>
+[ 1829.362451]  dump_stack+0x188/0x20d
+[ 1829.366080]  nmi_cpu_backtrace.cold+0x63/0xa2
+[ 1829.370578]  ? lapic_can_unplug_cpu.cold+0x44/0x44
+[ 1829.375513]  nmi_trigger_cpumask_backtrace+0x1a6/0x1eb
+[ 1829.380784]  rcu_dump_cpu_stacks+0x170/0x1bb
+[ 1829.385177]  rcu_check_callbacks.cold+0x634/0xddc
+[ 1829.390004]  ? trace_hardirqs_off+0x50/0x200
+[ 1829.394397]  update_process_times+0x2a/0x70
+[ 1829.398716]  tick_sched_handle+0x9b/0x180
+[ 1829.402846]  tick_sched_timer+0x42/0x130
+[ 1829.406890]  __hrtimer_run_queues+0x2fc/0xd50
+[ 1829.411365]  ? tick_sched_do_timer+0x1a0/0x1a0
+[ 1829.415933]  ? hrtimer_fixup_activate+0x30/0x30
+[ 1829.420583]  ? kvm_clock_read+0x14/0x30
+[ 1829.424688]  ? ktime_get_update_offsets_now+0x2db/0x450
+[ 1829.430052]  hrtimer_interrupt+0x312/0x770
+[ 1829.434284]  smp_apic_timer_interrupt+0x10c/0x550
+[ 1829.439178]  apic_timer_interrupt+0xf/0x20
+[ 1829.443404] RIP: 0010:prandom_u32+0x0/0xb0
+[ 1829.447625] Code: fd ff ff 48 89 ef e8 0f fd ff ff 48 89 ef e8 07 fd ff ff 48 89 ef e8 ff fc ff ff 48 89 ef 5d e9 f6 fc ff ff 66 0f 1f 44 00 00 <41> 54 53 48 83 ec 08 e8 84 df 13 fe bf 01 00 00 00 e8 9a e0 f2 fd
+[ 1829.466508] RSP: 0018:ffff8880ae707d18 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
+[ 1829.474235] RAX: 0000000000000014 RBX: ffff8880941a1980 RCX: ffffffff8158014d
+[ 1829.481483] RDX: 0000000000000100 RSI: ffffffff81580176 RDI: 0000000000000005
+[ 1829.488739] RBP: 0000000000000014 R08: ffff888090e5a200 R09: 0000000000000000
+[ 1829.495988] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae707d70
+[ 1829.503237] R13: 1ffff11015ce0faa R14: 0000000000000000 R15: ffff8880a672d550
+[ 1829.510581]  ? apic_timer_interrupt+0xa/0x20
+[ 1829.514974]  ? __msecs_to_jiffies+0x1d/0x50
+[ 1829.519314]  ? __msecs_to_jiffies+0x46/0x50
+[ 1829.523620]  garp_join_timer_arm+0x21/0x80
+[ 1829.527838]  call_timer_fn+0x177/0x700
+[ 1829.531708]  ? garp_gid_event+0x60/0x60
+[ 1829.535674]  ? process_timeout+0x40/0x40
+[ 1829.539769]  ? _raw_spin_unlock_irq+0x24/0x80
+[ 1829.544267]  ? garp_gid_event+0x60/0x60
+[ 1829.548224]  ? garp_gid_event+0x60/0x60
+[ 1829.552203]  run_timer_softirq+0x5d0/0x1540
+[ 1829.556512]  ? add_timer+0xab0/0xab0
+[ 1829.560209]  ? __lock_is_held+0xad/0x140
+[ 1829.564258]  __do_softirq+0x26c/0x93c
+[ 1829.568136]  irq_exit+0x17b/0x1c0
+[ 1829.571574]  smp_apic_timer_interrupt+0x136/0x550
+[ 1829.576404]  apic_timer_interrupt+0xf/0x20
+[ 1829.580619]  </IRQ>
+[ 1829.582840] RIP: 0010:__sanitizer_cov_trace_pc+0x44/0x50
+[ 1829.588273] Code: 75 2b 8b 90 d8 12 00 00 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 <48> 89 11 c3 0f 1f 84 00 00 00 00 00 65 4c 8b 04 25 40 ee 01 00 65
+[ 1829.607179] RSP: 0018:ffff88806cd6f9b8 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13
+[ 1829.614917] RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc9000e2e8000
+[ 1829.622174] RDX: 0000000000000b36 RSI: ffffffff81723f4d RDI: 0000000000000001
+[ 1829.629432] RBP: 000000000045c829 R08: ffff888090e5a200 R09: ffffed1015ce4733
+[ 1829.636713] R10: ffffed1015ce4732 R11: ffff8880ae723993 R12: 0000000000000000
+[ 1829.643965] R13: 0000000000000000 R14: ffff888090e5a200 R15: ffff88809092473f
+[ 1829.651233]  ? is_bpf_text_address+0xdd/0x160
+[ 1829.655719]  is_bpf_text_address+0xdd/0x160
+[ 1829.660028]  kernel_text_address+0x6e/0xe0
+[ 1829.664252]  __kernel_text_address+0x9/0x30
+[ 1829.668559]  unwind_get_return_address+0x5a/0xa0
+[ 1829.673298]  __save_stack_trace+0x8a/0xf0
+[ 1829.677437]  save_stack+0x32/0xa0
+[ 1829.680925]  ? kasan_kmalloc+0xbf/0xe0
+[ 1829.684797]  ? kmem_cache_alloc_trace+0x14d/0x7a0
+[ 1829.689628]  ? sock_alloc_inode+0x5f/0x250
+[ 1829.693883]  ? alloc_inode+0x5d/0x180
+[ 1829.697699]  ? new_inode_pseudo+0x14/0xe0
+[ 1829.701833]  ? sock_alloc+0x3c/0x260
+[ 1829.705568]  ? __sock_create+0xba/0x740
+[ 1829.709551]  ? __sys_socket+0xef/0x200
+[ 1829.713424]  ? __x64_sys_socket+0x6f/0xb0
+[ 1829.717561]  ? do_syscall_64+0xf9/0x620
+[ 1829.721523]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 1829.726885]  ? mark_held_locks+0xf0/0xf0
+[ 1829.730935]  ? check_preemption_disabled+0x41/0x280
+[ 1829.735938]  ? perf_trace_lock_acquire+0xf5/0x530
+[ 1829.740765]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[ 1829.745507]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[ 1829.750251]  ? lockdep_hardirqs_on+0x40b/0x5d0
+[ 1829.754880]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[ 1829.759626]  ? retint_kernel+0x2d/0x2d
+[ 1829.763506]  ? kasan_unpoison_shadow+0x30/0x40
+[ 1829.768075]  kasan_kmalloc+0xbf/0xe0
+[ 1829.771780]  kmem_cache_alloc_trace+0x14d/0x7a0
+[ 1829.776441]  ? selinux_socket_create+0x277/0x580
+[ 1829.781215]  ? selinux_sctp_assoc_request+0x570/0x570
+[ 1829.786392]  ? sock_destroy_inode+0x60/0x60
+[ 1829.790709]  sock_alloc_inode+0x5f/0x250
+[ 1829.794792]  ? sock_destroy_inode+0x60/0x60
+[ 1829.799100]  alloc_inode+0x5d/0x180
+[ 1829.802720]  new_inode_pseudo+0x14/0xe0
+[ 1829.806684]  sock_alloc+0x3c/0x260
+[ 1829.810243]  __sock_create+0xba/0x740
+[ 1829.814033]  __sys_socket+0xef/0x200
+[ 1829.817834]  ? move_addr_to_kernel+0x70/0x70
+[ 1829.822238]  ? __x64_sys_clock_gettime+0x165/0x240
+[ 1829.827346]  ? __ia32_sys_clock_settime+0x260/0x260
+[ 1829.832360]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[ 1829.837109]  ? trace_hardirqs_off_caller+0x55/0x210
+[ 1829.842124]  __x64_sys_socket+0x6f/0xb0
+[ 1829.846166]  ? lockdep_hardirqs_on+0x40b/0x5d0
+[ 1829.850792]  do_syscall_64+0xf9/0x620
+[ 1829.854595]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 1829.859781] RIP: 0033:0x45c829
+[ 1829.863020] Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
+[ 1829.881950] RSP: 002b:00007ff811f67c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
+[ 1829.889648] RAX: ffffffffffffffda RBX: 0000000000506760 RCX: 000000000045c829
+[ 1829.896904] RDX: 0000000000000000 RSI: 0000000000000803 RDI: 0000000000000001
+[ 1829.904162] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
+[ 1829.911546] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
+[ 1829.918865] R13: 0000000000000b6e R14: 00000000004cda30 R15: 00007ff811f686d4
diff --git a/pkg/report/testdata/linux/report/489 b/pkg/report/testdata/linux/report/489
new file mode 100644
index 000000000..d535afb4c
--- /dev/null
+++ b/pkg/report/testdata/linux/report/489
@@ -0,0 +1,66 @@
+TITLE: INFO: rcu detected stall in perf_event_mmap
+TYPE: HANG
+
+[  943.341024] INFO: rcu_preempt self-detected stall on CPU
+[  943.346749] 	0-...: (3 ticks this GP) idle=6fd/140000000000001/0 softirq=67682/67682 fqs=1 
+[  943.355256] 	 (t=18319 jiffies g=30395 c=30394 q=31)
+[  943.360542] rcu_preempt kthread starved for 15615 jiffies! g30395 c30394 f0x0 s3 ->state=0x0
+[  943.369144] Task dump for CPU 0:
+[  943.372531] blkid           R  running task    29216   513  10808 0x10000008
+[  943.380070]  ffff8801db407c18 9bcf3f0caf1cd16c ffff8801db407c50 ffffffff813d2223
+[  943.388247]  1ffff1003b683de8 0000000000000000 ffff8801db41e600 0000000000000000
+[  943.396431]  dffffc0000000000 ffffffff840fbe80 ffff8801db407c60 ffffffff813d223f
+[  943.404607] Call Trace:
+[  943.407212]  <IRQ>  [<ffffffff813d2223>] _sched_show_task+0x31f/0x32b
+[  943.414088]  [<ffffffff813d223f>] sched_show_task+0x10/0x12
+[  943.419849]  [<ffffffff813d22d5>] dump_cpu_task+0x7f/0x84
+[  943.425419]  [<ffffffff813d4c0b>] rcu_dump_cpu_stacks+0x151/0x165
+[  943.431747]  [<ffffffff812b12c0>] rcu_check_callbacks+0x6cf/0x144f
+[  943.438118]  [<ffffffff812bdccb>] update_process_times+0x36/0x66
+[  943.444369]  [<ffffffff812df1fd>] tick_sched_handle+0xf4/0x105
+[  943.450809]  [<ffffffff812df7ef>] tick_sched_timer+0x45/0xd8
+[  943.456914]  [<ffffffff812c09f7>] __hrtimer_run_queues+0x5d2/0x924
+[  943.463330]  [<ffffffff81274f55>] ? trace_event_get_offsets_lock.isra.0+0x67/0x67
+[  943.470982]  [<ffffffff812df7aa>] ? tick_sched_do_timer+0x8e/0x8e
+[  943.477248]  [<ffffffff812c0425>] ? hrtimer_start_expires+0x7b/0x7b
+[  943.483697]  [<ffffffff81274f55>] ? trace_event_get_offsets_lock.isra.0+0x67/0x67
+[  943.491362]  [<ffffffff812c135b>] hrtimer_interrupt+0x15c/0x348
+[  943.497511]  [<ffffffff81166053>] local_apic_timer_interrupt+0x9c/0xa3
+[  943.504293]  [<ffffffff8333bb72>] smp_trace_apic_timer_interrupt+0x23f/0x43b
+[  943.511515]  [<ffffffff83339b68>] trace_apic_timer_interrupt+0xa8/0xb0
+[  943.518203]  <EOI>  [<ffffffff81274f55>] ? trace_event_get_offsets_lock.isra.0+0x67/0x67
+[  943.526685]  [<ffffffff8146902d>] ? arch_local_irq_restore+0x2/0x8
+[  943.533035]  [<ffffffff8146be5f>] ? __slab_alloc.isra.0.constprop.0+0x6f/0x7c
+[  943.540338]  [<ffffffff813c993d>] ? perf_event_mmap+0x2b6/0x7ee
+[  943.546430]  [<ffffffff8146c10f>] kmem_cache_alloc_trace+0x81/0x139
+[  943.552861]  [<ffffffff813c993d>] ? perf_event_mmap+0x2b6/0x7ee
+[  943.558954]  [<ffffffff813c993d>] perf_event_mmap+0x2b6/0x7ee
+[  943.564868]  [<ffffffff8127d854>] ? lock_release+0x819/0x828
+[  943.570716]  [<ffffffff813c9687>] ? perf_event_comm+0x17a/0x17a
+[  943.576890]  [<ffffffff8143bd59>] ? vm_start_gap+0x73/0x7b
+[  943.582573]  [<ffffffff8143eaf7>] ? vma_link+0x10e/0x11b
+[  943.588070]  [<ffffffff814441c1>] mmap_region+0x8e7/0xb6c
+[  943.593653]  [<ffffffff814438da>] ? vm_brk+0x104/0x104
+[  943.599042]  [<ffffffff81274f55>] ? trace_event_get_offsets_lock.isra.0+0x67/0x67
+[  943.606769]  [<ffffffff81887cfd>] ? cap_mmap_addr+0xea/0xf2
+[  943.612515]  [<ffffffff8188ff0d>] ? security_mmap_addr+0x8c/0x97
+[  943.618712]  [<ffffffff8143d465>] ? get_unmapped_area+0x283/0x293
+[  943.624995]  [<ffffffff81444b6d>] do_mmap+0x727/0x7a2
+[  943.630241]  [<ffffffff81411fc9>] vm_mmap_pgoff+0x13e/0x1be
+[  943.635992]  [<ffffffff81411e8b>] ? vma_is_stack_for_task+0x97/0x97
+[  943.642442]  [<ffffffff812733e5>] ? up_write+0x1f/0x5d
+[  943.647756]  [<ffffffff814120bf>] vm_mmap+0x76/0x8f
+[  943.652969]  [<ffffffff81546256>] elf_map+0x1d3/0x1ed
+[  943.658201]  [<ffffffff81547731>] load_elf_binary+0xf79/0x3a88
+[  943.664254]  [<ffffffff815467b8>] ? writenote+0x241/0x241
+[  943.669830]  [<ffffffff8128351c>] ? do_raw_read_unlock+0x5/0x55
+[  943.675966]  [<ffffffff81498b8f>] search_binary_handler+0x17b/0x646
+[  943.682412]  [<ffffffff8149cd18>] do_execveat_common.isra.0+0x10a0/0x175e
+[  943.689390]  [<ffffffff814afa00>] ? putname+0x65/0xf9
+[  943.694618]  [<ffffffff8149bc78>] ? prepare_bprm_creds+0xfc/0xfc
+[  943.700840]  [<ffffffff81a247a8>] ? strncpy_from_user+0x1e4/0x1f6
+[  943.707124]  [<ffffffff814a205a>] ? audit_dummy_context+0x89/0x94
+[  943.713402]  [<ffffffff8149d411>] do_execve+0x3b/0x41
+[  943.718631]  [<ffffffff8149dc09>] SyS_execve+0x37/0x3b
+[  943.723967]  [<ffffffff83338e75>] stub_execve+0x5/0x5
+[  943.729207]  [<ffffffff83338cb5>] ? tracesys_phase2+0xa3/0xa8
diff --git a/pkg/report/testdata/linux/report/490 b/pkg/report/testdata/linux/report/490
new file mode 100644
index 000000000..7c37bbf33
--- /dev/null
+++ b/pkg/report/testdata/linux/report/490
@@ -0,0 +1,110 @@
+TITLE: INFO: rcu detected stall in neigh_timer_handler
+TYPE: HANG
+
+[  366.785711] INFO: rcu_preempt self-detected stall on CPU
+[  366.791254] 	0: (126 ticks this GP) idle=831/140000000000002/0 softirq=31611/31611 fqs=0 
+[  366.799538] 	 (t=10556 jiffies g=10195 c=10194 q=1)
+[  366.804657] rcu_preempt kthread starved for 10556 jiffies!
+[  366.810292] Task dump for CPU 0:
+[  366.813652] syz-executor.7  R  running task    26288 16095   1691 0x0000000c
+[  366.821062]  000000000000069b 000000004e28d452 ffffffff82a3b540 ffffffff8111527a
+[  366.829059]  ffffffff811150bb 000000004e28d452 0000000000000086 0000000000000000
+[  366.837057]  ffffffff82a9a750 0000000000000000 1ffffffff05534ea ffffffff82a9a728
+[  366.845047] Call Trace:
+[  366.847600]  <IRQ>  [<ffffffff8111527a>] sched_show_task+0x2da/0x4a0
+[  366.854190]  [<ffffffff811150bb>] ? sched_show_task+0x11b/0x4a0
+[  366.860218]  [<ffffffff81117100>] dump_cpu_task+0x20/0x30
+[  366.865729]  [<ffffffff81160a5c>] rcu_dump_cpu_stacks+0x18c/0x290
+[  366.871932]  [<ffffffff8116a6c6>] rcu_check_callbacks+0xa16/0x1eb0
+[  366.878221]  [<ffffffff81182d60>] ? timekeeping_inject_sleeptime64+0xa0/0xa0
+[  366.885379]  [<ffffffff817d82b3>] ? __this_cpu_preempt_check+0x13/0x20
+[  366.892017]  [<ffffffff81118c05>] ? account_system_time+0x1a5/0x4f0
+[  366.898393]  [<ffffffff811710a3>] update_process_times+0x33/0x60
+[  366.904510]  [<ffffffff81193fdd>] tick_sched_handle.isra.8+0x3d/0xd0
+[  366.910986]  [<ffffffff8119408a>] ? tick_sched_timer+0x1a/0xe0
+[  366.916939]  [<ffffffff811940d7>] tick_sched_timer+0x67/0xe0
+[  366.922708]  [<ffffffff81194070>] ? tick_sched_handle.isra.8+0xd0/0xd0
+[  366.929346]  [<ffffffff81172d92>] __run_hrtimer.isra.7+0xb2/0x210
+[  366.935549]  [<ffffffff811732b4>] hrtimer_interrupt+0x164/0x3d0
+[  366.941579]  [<ffffffff8107f325>] smp_trace_apic_timer_interrupt+0x95/0xe0
+[  366.948574]  [<ffffffff8107f379>] smp_apic_timer_interrupt+0x9/0x10
+[  366.954954]  [<ffffffff822fbb31>] apic_timer_interrupt+0x71/0x80
+[  366.961081]  [<ffffffff81131a9f>] ? mark_held_locks+0xcf/0x140
+[  366.967027]  [<ffffffff81299c24>] ? __slab_alloc.isra.25.constprop.27+0x584/0x5a0
+[  366.974619]  [<ffffffff81ebd306>] ? __alloc_skb+0xd6/0x5d0
+[  366.980225]  [<ffffffff81132680>] ? debug_check_no_locks_freed+0x2a0/0x2a0
+[  366.987208]  [<ffffffff81ebd306>] ? __alloc_skb+0xd6/0x5d0
+[  366.992819]  [<ffffffff81299d1e>] kmem_cache_alloc+0xde/0x110
+[  366.998676]  [<ffffffff81ebd306>] __alloc_skb+0xd6/0x5d0
+[  367.004099]  [<ffffffff81ebd230>] ? __kmalloc_reserve.isra.7+0xb0/0xb0
+[  367.010738]  [<ffffffff82164b4d>] ? ipv6_get_lladdr+0x27d/0x3f0
+[  367.016774]  [<ffffffff810bbf27>] ? __local_bh_enable_ip+0x67/0xe0
+[  367.023064]  [<ffffffff821944b8>] ndisc_alloc_skb+0x128/0x4f0
+[  367.028932]  [<ffffffff821988b6>] ndisc_send_ns+0x346/0x710
+[  367.034616]  [<ffffffff82198570>] ? ndisc_netdev_event+0x310/0x310
+[  367.040905]  [<ffffffff81299cda>] ? kmem_cache_alloc+0x9a/0x110
+[  367.046944]  [<ffffffff82198f28>] ndisc_solicit+0x2a8/0x640
+[  367.052625]  [<ffffffff81ebd230>] ? __kmalloc_reserve.isra.7+0xb0/0xb0
+[  367.059264]  [<ffffffff822fa265>] ? _raw_spin_unlock_irqrestore+0x45/0x80
+[  367.066164]  [<ffffffff82198c80>] ? ndisc_send_ns+0x710/0x710
+[  367.072023]  [<ffffffff81f113a7>] neigh_probe+0xa7/0xe0
+[  367.077361]  [<ffffffff81f21662>] neigh_timer_handler+0x402/0xbd0
+[  367.083564]  [<ffffffff81f21260>] ? neightbl_dump_info+0xa10/0xa10
+[  367.089874]  [<ffffffff8116e928>] call_timer_fn+0x128/0x1e0
+[  367.095567]  [<ffffffff8116e8dc>] ? call_timer_fn+0xdc/0x1e0
+[  367.101339]  [<ffffffff8116e800>] ? process_timeout+0x10/0x10
+[  367.107211]  [<ffffffff822fa2cb>] ? _raw_spin_unlock_irq+0x2b/0x60
+[  367.113500]  [<ffffffff81131caa>] ? trace_hardirqs_on_caller+0x19a/0x5a0
+[  367.120313]  [<ffffffff811706cf>] run_timer_softirq+0x55f/0x850
+[  367.126343]  [<ffffffff817b36c8>] ? trace_hardirqs_on_thunk+0x17/0x19
+[  367.132894]  [<ffffffff81f21260>] ? neightbl_dump_info+0xa10/0xa10
+[  367.139194]  [<ffffffff81170170>] ? cascade+0x2d0/0x2d0
+[  367.144528]  [<ffffffff810bc4f1>] __do_softirq+0x281/0x560
+[  367.150124]  [<ffffffff810bca58>] irq_exit+0x118/0x160
+[  367.155371]  [<ffffffff8107f32a>] smp_trace_apic_timer_interrupt+0x9a/0xe0
+[  367.162368]  [<ffffffff8107f379>] smp_apic_timer_interrupt+0x9/0x10
+[  367.168747]  [<ffffffff822fbb31>] apic_timer_interrupt+0x71/0x80
+[  367.174870]  <EOI>  [<ffffffff81299c24>] ? __slab_alloc.isra.25.constprop.27+0x584/0x5a0
+[  367.183200]  [<ffffffff81228942>] ? shrink_slab.part.6.constprop.15+0x3d2/0x540
+[  367.190622]  [<ffffffff81317e53>] ? __bdi_start_writeback+0x53/0x190
+[  367.197087]  [<ffffffff81132680>] ? debug_check_no_locks_freed+0x2a0/0x2a0
+[  367.204069]  [<ffffffff81131f1d>] ? trace_hardirqs_on_caller+0x40d/0x5a0
+[  367.210885]  [<ffffffff81317e53>] ? __bdi_start_writeback+0x53/0x190
+[  367.217352]  [<ffffffff81299d1e>] kmem_cache_alloc+0xde/0x110
+[  367.223208]  [<ffffffff81317e53>] __bdi_start_writeback+0x53/0x190
+[  367.229499]  [<ffffffff8131d41f>] wakeup_flusher_threads+0x15f/0x2f0
+[  367.235972]  [<ffffffff8131d348>] ? wakeup_flusher_threads+0x88/0x2f0
+[  367.242525]  [<ffffffff8131d2c0>] ? bdi_writeback_workfn+0x930/0x930
+[  367.248988]  [<ffffffff812150c4>] ? free_pcppages_bulk+0x8d4/0xcd0
+[  367.255277]  [<ffffffff817da846>] ? debug_object_free+0x1e6/0x380
+[  367.261482]  [<ffffffff8122fcbb>] try_to_free_pages+0x66b/0xde0
+[  367.267527]  [<ffffffff8122f650>] ? shrink_zone+0x680/0x680
+[  367.273221]  [<ffffffff812193ee>] __alloc_pages_nodemask+0x86e/0xf60
+[  367.279686]  [<ffffffff822fa2dc>] ? _raw_spin_unlock_irq+0x3c/0x60
+[  367.285976]  [<ffffffff81218b80>] ? __alloc_pages_direct_compact+0x240/0x240
+[  367.293148]  [<ffffffff822fb951>] ? retint_kernel+0x2c/0x2c
+[  367.298828]  [<ffffffff822fb951>] ? retint_kernel+0x2c/0x2c
+[  367.304619]  [<ffffffff812805d8>] __vmalloc_node_range+0x228/0x640
+[  367.310912]  [<ffffffff82227f5f>] ? packet_set_ring+0x6ff/0x1910
+[  367.317028]  [<ffffffff81280d5f>] vzalloc+0x4f/0x60
+[  367.322018]  [<ffffffff82227f5f>] ? packet_set_ring+0x6ff/0x1910
+[  367.328132]  [<ffffffff81219af8>] ? __get_free_pages+0x18/0x60
+[  367.334076]  [<ffffffff82227f5f>] packet_set_ring+0x6ff/0x1910
+[  367.340033]  [<ffffffff82227860>] ? tpacket_destruct_skb+0x5d0/0x5d0
+[  367.346509]  [<ffffffff81258ea9>] ? might_fault+0xc9/0x170
+[  367.352106]  [<ffffffff8110cdae>] ? __might_sleep+0x8e/0x1a0
+[  367.357887]  [<ffffffff8222a207>] packet_setsockopt+0x7c7/0x20d0
+[  367.364003]  [<ffffffff82229a40>] ? packet_release+0x8d0/0x8d0
+[  367.369945]  [<ffffffff8110d510>] ? preempt_count_add+0xf0/0x180
+[  367.376063]  [<ffffffff812f93ad>] ? __fget+0x3d/0x330
+[  367.381225]  [<ffffffff812f9738>] ? __fget_light+0x78/0x1f0
+[  367.386909]  [<ffffffff81258ea9>] ? might_fault+0xc9/0x170
+[  367.392505]  [<ffffffff812f98be>] ? __fdget+0xe/0x10
+[  367.397593]  [<ffffffff81e9dd4c>] ? sockfd_lookup_light+0x1c/0x160
+[  367.403913]  [<ffffffff81ea3c77>] SyS_setsockopt+0x147/0x230
+[  367.409812]  [<ffffffff81ea3b30>] ? SyS_recv+0x20/0x20
+[  367.415090]  [<ffffffff8117904d>] ? SyS_clock_gettime+0x14d/0x1a0
+[  367.421307]  [<ffffffff81178f00>] ? SyS_clock_settime+0x1f0/0x1f0
+[  367.427516]  [<ffffffff812fb263>] ? __fd_install+0xf3/0x1a0
+[  367.433198]  [<ffffffff817b36f5>] ? lockdep_sys_exit_thunk+0x12/0x14
+[  367.439667]  [<ffffffff822fad6b>] system_call_fastpath+0x12/0x76
diff --git a/pkg/report/testdata/linux/report/491 b/pkg/report/testdata/linux/report/491
new file mode 100644
index 000000000..bb724f590
--- /dev/null
+++ b/pkg/report/testdata/linux/report/491
@@ -0,0 +1,99 @@
+TITLE: INFO: rcu detected stall in kernfs_fop_open
+TYPE: HANG
+
+[  163.636748][    C0] rcu: INFO: rcu_preempt self-detected stall on CPU
+[  163.643596][    C0] rcu: 	0-...!: (10499 ticks this GP) idle=bea/1/0x4000000000000002 softirq=10739/10739 fqs=41 
+[  163.654339][    C0] 	(t=10500 jiffies g=6073 q=50)
+[  163.659278][    C0] rcu: rcu_preempt kthread starved for 10418 jiffies! g6073 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
+[  163.670361][    C0] rcu: RCU grace-period kthread stack dump:
+[  163.676237][    C0] rcu_preempt     R  running task    29032    10      2 0x80004000
+[  163.684146][    C0] Call Trace:
+[  163.687438][    C0]  __schedule+0x9a0/0xcc0
+[  163.691764][    C0]  schedule+0x181/0x210
+[  163.695906][    C0]  schedule_timeout+0x14f/0x240
+[  163.700744][    C0]  ? run_local_timers+0x120/0x120
+[  163.705760][    C0]  rcu_gp_kthread+0xed8/0x1770
+[  163.710521][    C0]  kthread+0x332/0x350
+[  163.714571][    C0]  ? rcu_report_qs_rsp+0x140/0x140
+[  163.719666][    C0]  ? kthread_blkcg+0xe0/0xe0
+[  163.724244][    C0]  ret_from_fork+0x24/0x30
+[  163.728659][    C0] NMI backtrace for cpu 0
+[  163.732977][    C0] CPU: 0 PID: 8154 Comm: udevd Not tainted 5.4.0-syzkaller #0
+[  163.740409][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  163.750445][    C0] Call Trace:
+[  163.753716][    C0]  <IRQ>
+[  163.756552][    C0]  dump_stack+0x1fb/0x318
+[  163.760871][    C0]  nmi_cpu_backtrace+0xaf/0x1a0
+[  163.765703][    C0]  ? nmi_trigger_cpumask_backtrace+0x16d/0x290
+[  163.771842][    C0]  ? arch_trigger_cpumask_backtrace+0x20/0x20
+[  163.777894][    C0]  nmi_trigger_cpumask_backtrace+0x174/0x290
+[  163.783862][    C0]  arch_trigger_cpumask_backtrace+0x10/0x20
+[  163.789736][    C0]  rcu_dump_cpu_stacks+0x15a/0x220
+[  163.795099][    C0]  rcu_sched_clock_irq+0xe25/0x1ad0
+[  163.800286][    C0]  ? trace_hardirqs_off+0x74/0x80
+[  163.805305][    C0]  update_process_times+0x12d/0x180
+[  163.810492][    C0]  tick_sched_timer+0x263/0x420
+[  163.815325][    C0]  ? tick_setup_sched_timer+0x3d0/0x3d0
+[  163.820858][    C0]  __hrtimer_run_queues+0x403/0x840
+[  163.826057][    C0]  hrtimer_interrupt+0x38c/0xda0
+[  163.830994][    C0]  ? debug_smp_processor_id+0x9/0x20
+[  163.836266][    C0]  smp_apic_timer_interrupt+0x109/0x280
+[  163.841798][    C0]  apic_timer_interrupt+0xf/0x20
+[  163.846746][    C0]  </IRQ>
+[  163.849695][    C0] RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50
+[  163.855844][    C0] Code: 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e f7 c2 00 01 1f 00 75 2c 8b 91 80 13 00 00 <83> fa 02 75 21 48 8b 91 88 13 00 00 48 8b 32 48 8d 7e 01 8b 89 84
+[  163.875558][    C0] RSP: 0018:ffffc90001e27420 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
+[  163.883971][    C0] RAX: ffffffff81487326 RBX: ffffea000245ed00 RCX: ffff888098f940c0
+[  163.891944][    C0] RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea000245ed00
+[  163.899920][    C0] RBP: ffffc90001e27448 R08: 000000000003a768 R09: ffffed10145822e7
+[  163.907888][    C0] R10: ffffed10145822e7 R11: 0000000000000000 R12: ffff88808cebdf20
+[  163.915856][    C0] R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff8880a2c11728
+[  163.923848][    C0]  ? mod_memcg_page_state+0x16/0x190
+[  163.929153][    C0]  ? mod_memcg_page_state+0x16/0x190
+[  163.934446][    C0]  free_thread_stack+0x168/0x590
+[  163.939475][    C0]  put_task_stack+0xa3/0x130
+[  163.944333][    C0]  finish_task_switch+0x3f1/0x550
+[  163.949364][    C0]  __schedule+0x9a8/0xcc0
+[  163.953710][    C0]  preempt_schedule_irq+0xc1/0x140
+[  163.958819][    C0]  retint_kernel+0x1b/0x2b
+[  163.963224][    C0] RIP: 0010:qlink_free+0x91/0xb0
+[  163.968256][    C0] Code: 58 07 00 74 35 4c 89 f7 57 9d 0f 1f 44 00 00 e8 15 1b ca ff eb 19 e8 ae 18 ca ff 48 83 3d 0e 7a 58 07 00 74 17 4c 89 f7 57 9d <0f> 1f 44 00 00 5b 41 5e 41 5f 5d c3 0f 0b 0f 0b 0f 0b 0f 0b 90 66
+[  163.987862][    C0] RSP: 0018:ffffc90001e276a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
+[  163.996355][    C0] RAX: ffff888098f94954 RBX: ffff888091e2d000 RCX: ffffffff815c0597
+[  164.004319][    C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286
+[  164.012324][    C0] RBP: ffffc90001e276c0 R08: ffff888098f94918 R09: fffffbfff13c8d2f
+[  164.020307][    C0] R10: fffffbfff13c8d2f R11: 0000000000000000 R12: ffff888091e2d000
+[  164.028263][    C0] R13: 0000000000000200 R14: 0000000000000286 R15: ffff8880aa812a80
+[  164.036244][    C0]  ? mark_lock+0x107/0x1650
+[  164.040744][    C0]  quarantine_reduce+0x15e/0x1d0
+[  164.045668][    C0]  __kasan_kmalloc+0x46/0x1b0
+[  164.050340][    C0]  ? rcu_read_lock_sched_held+0x10b/0x170
+[  164.056064][    C0]  ? trace_mm_page_alloc+0x18c/0x1f0
+[  164.061363][    C0]  ? __kasan_check_read+0x11/0x20
+[  164.066380][    C0]  ? mark_lock+0x107/0x1650
+[  164.070884][    C0]  ? do_raw_spin_unlock+0x136/0x260
+[  164.076083][    C0]  ? _raw_spin_unlock+0x27/0x40
+[  164.080931][    C0]  ? cache_grow_end+0x143/0x170
+[  164.085776][    C0]  ? lockdep_hardirqs_on+0x3c5/0x7d0
+[  164.091053][    C0]  ? kmem_cache_alloc_trace+0x199/0x2f0
+[  164.096591][    C0]  kasan_slab_alloc+0xf/0x20
+[  164.101168][    C0]  kmem_cache_alloc_trace+0x1fa/0x2f0
+[  164.106529][    C0]  ? kernfs_fop_open+0x3a9/0xc20
+[  164.111455][    C0]  kernfs_fop_open+0x3a9/0xc20
+[  164.116212][    C0]  ? kernfs_fop_mmap+0x4f0/0x4f0
+[  164.121171][    C0]  do_dentry_open+0x740/0x10c0
+[  164.125930][    C0]  vfs_open+0x73/0x80
+[  164.129901][    C0]  path_openat+0x1397/0x44a0
+[  164.134516][    C0]  do_filp_open+0x192/0x3d0
+[  164.139026][    C0]  do_sys_open+0x29f/0x560
+[  164.143433][    C0]  __x64_sys_open+0x87/0x90
+[  164.147924][    C0]  do_syscall_64+0xf7/0x1c0
+[  164.152417][    C0]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[  164.158294][    C0] RIP: 0033:0x7f2260db5120
+[  164.162702][    C0] Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
+[  164.182288][    C0] RSP: 002b:00007ffd6e7b1a68 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
+[  164.190685][    C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2260db5120
+[  164.198638][    C0] RDX: 0000000000000124 RSI: 0000000000080000 RDI: 00007ffd6e7b1b10
+[  164.206679][    C0] RBP: 0000000000f8c744 R08: 0000000000f8c744 R09: 00007f2260e0ac20
+[  164.214632][    C0] R10: 7269762f73656369 R11: 0000000000000246 R12: 0000000000f83e60
+[  164.222588][    C0] R13: 0000000000f83f50 R14: 0000000000f72250 R15: 0000000000f77e10
diff --git a/pkg/report/testdata/linux/report/492 b/pkg/report/testdata/linux/report/492
new file mode 100644
index 000000000..336afc940
--- /dev/null
+++ b/pkg/report/testdata/linux/report/492
@@ -0,0 +1,350 @@
+# TODO: this should be "in hsr_announce".
+TITLE: INFO: rcu detected stall in drm_ioctl
+TYPE: HANG
+
+[ 3239.542037][    C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
+[ 3239.549968][    C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[ 3239.556878][    C1] rcu: 	0-...!: (1 GPs behind) idle=a3e/1/0x4000000000000002 softirq=387990/387991 fqs=1 
+[ 3239.566893][    C0] Call Trace:
+[ 3239.576747][    C1] 	(detected by 1, t=10586 jiffies, g=559657, q=0)
+[ 3239.579996][    C0]  <IRQ>
+[ 3239.586683][    C1] Sending NMI from CPU 1 to CPUs 0:
+[ 3239.589505][    C0]  dump_stack+0x172/0x1f0
+[ 3239.596674][    C1] NMI backtrace for cpu 0
+[ 3239.596680][    C1] CPU: 0 PID: 28547 Comm: syz-executor.1 Not tainted 5.3.0-rc6 #120
+[ 3239.596686][    C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[ 3239.596690][    C1] RIP: 0010:__sanitizer_cov_trace_switch+0x49/0x80
+[ 3239.596700][    C1] Code: 74 46 48 83 f8 10 75 27 bf 03 00 00 00 4d 8b 2c 24 31 db 4d 85 ed 74 17 49 8b 74 dc 10 48 83 c3 01 48 8b 4d 08 e8 47 fe ff ff <49> 39 dd 75 e9 5b 41 5c 41 5d 5d c3 48 83 f8 40 bf 07 00 00 00 74
+[ 3239.596704][    C1] RSP: 0018:ffff8880ae808fc0 EFLAGS: 00000006
+[ 3239.596711][    C1] RAX: 0000000000000103 RBX: 0000000000000006 RCX: ffffffff873a3ef9
+[ 3239.596716][    C1] RDX: 000000000000000f RSI: 0000000000000005 RDI: 0000000000000001
+[ 3239.596721][    C1] RBP: ffff8880ae808fd8 R08: ffff888017270080 R09: ffffed1015d0124a
+[ 3239.596726][    C1] R10: ffffed1015d01249 R11: ffff8880ae80924d R12: ffffffff88474c00
+[ 3239.596730][    C1] R13: 0000000000000008 R14: 000000000000000f R15: ffff8880ae809098
+[ 3239.596735][    C1] FS:  00007f0bb4900700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
+[ 3239.596740][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+[ 3239.596744][    C1] CR2: 000000000045984f CR3: 000000003ebb6000 CR4: 00000000001426f0
+[ 3239.596749][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
+[ 3239.596754][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
+[ 3239.596756][    C1] Call Trace:
+[ 3239.596758][    C1]  <IRQ>
+[ 3239.596761][    C1]  vsnprintf+0x1a9/0x19a0
+[ 3239.596764][    C1]  ? pointer+0x750/0x750
+[ 3239.596767][    C1]  ? pointer+0x750/0x750
+[ 3239.596771][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.596774][    C1]  snprintf+0xbb/0xf0
+[ 3239.596777][    C1]  ? vsprintf+0x40/0x40
+[ 3239.596780][    C1]  ? scnprintf+0x140/0x140
+[ 3239.596784][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.596787][    C1]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3239.596791][    C1]  msg_print_text+0x1a2/0x5c0
+[ 3239.596794][    C1]  ? mark_held_locks+0xf0/0xf0
+[ 3239.596797][    C1]  ? msg_print_ext_body+0x450/0x450
+[ 3239.596800][    C1]  ? __kasan_check_write+0x14/0x20
+[ 3239.596804][    C1]  ? do_raw_spin_lock+0x143/0x2e0
+[ 3239.596807][    C1]  ? console_unlock+0x1c5/0xf10
+[ 3239.596810][    C1]  console_unlock+0x38d/0xf10
+[ 3239.596813][    C1]  vprintk_emit+0x2a0/0x700
+[ 3239.596817][    C1]  vprintk_default+0x28/0x30
+[ 3239.596820][    C1]  vprintk_func+0x7e/0x189
+[ 3239.596823][    C1]  ? lock_downgrade+0x920/0x920
+[ 3239.596825][    C1]  printk+0xba/0xed
+[ 3239.596829][    C1]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
+[ 3239.596832][    C1]  ? is_bpf_text_address+0xd3/0x170
+[ 3239.596835][    C1]  ? dump_stack+0x172/0x1f0
+[ 3239.596839][    C1]  show_trace_log_lvl+0x23a/0x28c
+[ 3239.596842][    C1]  ? dump_stack+0x172/0x1f0
+[ 3239.596845][    C1]  ? dump_stack+0x172/0x1f0
+[ 3239.596848][    C1]  show_stack+0x39/0x3b
+[ 3239.596852][    C1]  dump_stack+0x172/0x1f0
+[ 3239.596855][    C1]  warn_alloc.cold+0x87/0x17f
+[ 3239.596858][    C1]  ? zone_watermark_ok_safe+0x260/0x260
+[ 3239.596862][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.596865][    C1]  ? wakeup_kswapd+0x66/0x6a0
+[ 3239.596869][    C1]  ? __isolate_free_page+0x4c0/0x4c0
+[ 3239.596872][    C1]  ? wake_all_kswapds+0x14d/0x300
+[ 3239.596875][    C1]  __alloc_pages_slowpath+0x1f2e/0x2520
+[ 3239.596879][    C1]  ? __zone_watermark_ok+0x208/0x360
+[ 3239.596882][    C1]  ? warn_alloc+0x110/0x110
+[ 3239.596886][    C1]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3239.596889][    C1]  ? should_fail+0x1de/0x852
+[ 3239.596892][    C1]  ? __isolate_free_page+0x4c0/0x4c0
+[ 3239.596896][    C1]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3239.596900][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.596903][    C1]  __alloc_pages_nodemask+0x630/0x900
+[ 3239.596906][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.596910][    C1]  ? __alloc_pages_slowpath+0x2520/0x2520
+[ 3239.596913][    C1]  ? lock_downgrade+0x920/0x920
+[ 3239.596917][    C1]  cache_grow_begin+0x90/0xd20
+[ 3239.596921][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.596924][    C1]  ? mempolicy_slab_node+0x139/0x390
+[ 3239.596928][    C1]  fallback_alloc+0x1fd/0x2d0
+[ 3239.596931][    C1]  ____cache_alloc_node+0x1bc/0x1d0
+[ 3239.596935][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.596938][    C1]  kmem_cache_alloc+0x1ef/0x710
+[ 3239.596941][    C1]  ? mod_timer+0x50c/0xc10
+[ 3239.596945][    C1]  ? __netdev_alloc_skb+0x38a/0x440
+[ 3239.596948][    C1]  __build_skb+0x26/0x70
+[ 3239.596951][    C1]  __netdev_alloc_skb+0x255/0x440
+[ 3239.596955][    C1]  send_hsr_supervision_frame+0x110/0xf20
+[ 3239.596958][    C1]  ? lock_acquire+0x190/0x410
+[ 3239.596961][    C1]  ? hsr_dev_open+0x380/0x380
+[ 3239.596965][    C1]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
+[ 3239.596967][    C1]  hsr_announce+0x12f/0x3b0
+[ 3239.596975][    C1]  call_timer_fn+0x1ac/0x780
+[ 3239.596978][    C1]  ? hsr_dev_open+0x380/0x380
+[ 3239.596982][    C1]  ? msleep_interruptible+0x150/0x150
+[ 3239.596985][    C1]  ? trace_hardirqs_on+0x67/0x240
+[ 3239.596989][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.596992][    C1]  ? hsr_dev_open+0x380/0x380
+[ 3239.596995][    C1]  ? hsr_dev_open+0x380/0x380
+[ 3239.596998][    C1]  run_timer_softirq+0x697/0x17a0
+[ 3239.597001][    C1]  ? add_timer+0x930/0x930
+[ 3239.597004][    C1]  ? kvm_clock_read+0x18/0x30
+[ 3239.597008][    C1]  ? sched_clock+0x2e/0x50
+[ 3239.597011][    C1]  ? sched_clock_cpu+0x1b/0x1b0
+[ 3239.597015][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.597019][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.597022][    C1]  __do_softirq+0x262/0x98c
+[ 3239.597025][    C1]  ? sched_clock_cpu+0x1b/0x1b0
+[ 3239.597028][    C1]  irq_exit+0x19b/0x1e0
+[ 3239.597032][    C1]  smp_apic_timer_interrupt+0x1a3/0x610
+[ 3239.597035][    C1]  apic_timer_interrupt+0xf/0x20
+[ 3239.597037][    C1]  </IRQ>
+[ 3239.597041][    C1] RIP: 0010:console_unlock+0xdab/0xf10
+[ 3239.597051][    C1] Code: 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 30 48 83 3d d2 2f 77 07 00 74 1f e8 5b af 16 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 64 fa ff ff e8 56 be 50 00 e9 0e f5 ff ff e8 3c
+[ 3239.597055][    C1] RSP: 0018:ffff88819f797238 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
+[ 3239.597063][    C1] RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc9000ebe7000
+[ 3239.597068][    C1] RDX: 0000000000040000 RSI: ffffffff815bc485 RDI: 0000000000000246
+[ 3239.597072][    C1] RBP: ffff88819f7972c0 R08: ffff888017270080 R09: fffffbfff134af88
+[ 3239.597077][    C1] R10: fffffbfff134af87 R11: ffffffff89a57c3f R12: 0000000000000001
+[ 3239.597082][    C1] R13: ffffffff84335bb0 R14: dffffc0000000000 R15: ffffffff893ca450
+[ 3239.597085][    C1]  ? netconsole_netdev_event+0x2a0/0x2a0
+[ 3239.597089][    C1]  ? console_unlock+0xda5/0xf10
+[ 3239.597092][    C1]  vprintk_emit+0x2a0/0x700
+[ 3239.597095][    C1]  vprintk_default+0x28/0x30
+[ 3239.597098][    C1]  vprintk_func+0x7e/0x189
+[ 3239.597101][    C1]  printk+0xba/0xed
+[ 3239.597104][    C1]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
+[ 3239.597108][    C1]  ? _raw_spin_unlock_irq+0x5e/0x90
+[ 3239.597112][    C1]  dump_unreclaimable_slab.cold+0xde/0xe8
+[ 3239.597115][    C1]  dump_header+0x3f3/0x82d
+[ 3239.597118][    C1]  oom_kill_process.cold+0x10/0x15
+[ 3239.597121][    C1]  out_of_memory+0x79a/0x12c0
+[ 3239.597125][    C1]  ? oom_killer_disable+0x280/0x280
+[ 3239.597128][    C1]  ? mutex_trylock+0x252/0x2d0
+[ 3239.597131][    C1]  ? __alloc_pages_slowpath+0xb69/0x2520
+[ 3239.597135][    C1]  __alloc_pages_slowpath+0x1dde/0x2520
+[ 3239.597138][    C1]  ? __zone_watermark_ok+0x208/0x360
+[ 3239.597141][    C1]  ? warn_alloc+0x110/0x110
+[ 3239.597145][    C1]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3239.597148][    C1]  ? should_fail+0x1de/0x852
+[ 3239.597152][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.597155][    C1]  __alloc_pages_nodemask+0x630/0x900
+[ 3239.597159][    C1]  ? __alloc_pages_slowpath+0x2520/0x2520
+[ 3239.597162][    C1]  ? retint_kernel+0x2b/0x2b
+[ 3239.597166][    C1]  ? __sanitizer_cov_trace_const_cmp2+0x18/0x20
+[ 3239.597169][    C1]  alloc_pages_current+0x107/0x210
+[ 3239.597172][    C1]  ? ___might_sleep+0x163/0x280
+[ 3239.597175][    C1]  __vmalloc_node_range+0x4a9/0x7d0
+[ 3239.597179][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.597183][    C1]  ? drm_property_create_blob.part.0+0x32/0x320
+[ 3239.597187][    C1]  __vmalloc_node_flags_caller+0x71/0x90
+[ 3239.597191][    C1]  ? drm_property_create_blob.part.0+0x32/0x320
+[ 3239.597194][    C1]  kvmalloc_node+0xdc/0x100
+[ 3239.597198][    C1]  drm_property_create_blob.part.0+0x32/0x320
+[ 3239.597201][    C1]  ? drm_dev_exit+0x60/0x60
+[ 3239.597204][    C1]  drm_mode_createblob_ioctl+0x138/0x480
+[ 3239.597207][    C1]  drm_ioctl_kernel+0x244/0x300
+[ 3239.597211][    C1]  ? drm_mode_getblob_ioctl+0x2d0/0x2d0
+[ 3239.597215][    C1]  ? drm_setversion+0x8a0/0x8a0
+[ 3239.597218][    C1]  ? copy_user_enhanced_fast_string+0xe/0x20
+[ 3239.597222][    C1]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3239.597225][    C1]  ? _copy_from_user+0x12c/0x1a0
+[ 3239.597228][    C1]  drm_ioctl+0x54e/0xa55
+[ 3239.597232][    C1]  ? drm_mode_getblob_ioctl+0x2d0/0x2d0
+[ 3239.597235][    C1]  ? drm_version+0x3d0/0x3d0
+[ 3239.597239][    C1]  ? tomoyo_execute_permission+0x4a0/0x4a0
+[ 3239.597242][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.597245][    C1]  ? ___might_sleep+0x163/0x280
+[ 3239.597249][    C1]  ? drm_version+0x3d0/0x3d0
+[ 3239.597252][    C1]  do_vfs_ioctl+0xdb6/0x13e0
+[ 3239.597255][    C1]  ? ioctl_preallocate+0x210/0x210
+[ 3239.597258][    C1]  ? selinux_file_mprotect+0x620/0x620
+[ 3239.597261][    C1]  ? __fget+0x384/0x560
+[ 3239.597264][    C1]  ? ksys_dup3+0x3e0/0x3e0
+[ 3239.597268][    C1]  ? nsecs_to_jiffies+0x30/0x30
+[ 3239.597271][    C1]  ? tomoyo_file_ioctl+0x23/0x30
+[ 3239.597275][    C1]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.597278][    C1]  ? security_file_ioctl+0x8d/0xc0
+[ 3239.597281][    C1]  ksys_ioctl+0xab/0xd0
+[ 3239.597284][    C1]  __x64_sys_ioctl+0x73/0xb0
+[ 3239.597287][    C1]  do_syscall_64+0xfd/0x6a0
+[ 3239.597291][    C1]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3239.597293][    C1] RIP: 0033:0x459879
+[ 3239.597296][    C1] Code: Bad RIP value.
+[ 3239.597300][    C1] RSP: 002b:00007f0bb48ffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
+[ 3239.597308][    C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
+[ 3239.597313][    C1] RDX: 0000000020000080 RSI: ffffffffffffffbd RDI: 0000000000000003
+[ 3239.597317][    C1] RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
+[ 3239.597322][    C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0bb49006d4
+[ 3239.597327][    C1] R13: 00000000004c0ca1 R14: 00000000004d3dd8 R15: 00000000ffffffff
+[ 3239.597342][    C1] rcu: rcu_preempt kthread starved for 10555 jiffies! g559657 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
+[ 3239.600615][    C0]  warn_alloc.cold+0x87/0x17f
+[ 3239.604902][    C1] rcu: RCU grace-period kthread stack dump:
+[ 3239.612852][    C0]  ? zone_watermark_ok_safe+0x260/0x260
+[ 3239.622867][    C1] rcu_preempt     R  running task    29160    10      2 0x80004000
+[ 3239.629338][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.648905][    C1] Call Trace:
+[ 3239.654940][    C0]  ? wakeup_kswapd+0x66/0x6a0
+[ 3239.662911][    C1]  __schedule+0x755/0x1580
+[ 3239.670858][    C0]  ? __isolate_free_page+0x4c0/0x4c0
+[ 3239.678796][    C1]  ? __sched_text_start+0x8/0x8
+[ 3239.686732][    C0]  ? wake_all_kswapds+0x14d/0x300
+[ 3239.694672][    C1]  schedule+0xd9/0x260
+[ 3239.703567][    C0]  __alloc_pages_slowpath+0x1f2e/0x2520
+[ 3239.710127][    C1]  schedule_timeout+0x486/0xc50
+[ 3239.718073][    C0]  ? __zone_watermark_ok+0x208/0x360
+[ 3239.726021][    C1]  ? rwlock_bug.part.0+0x90/0x90
+[ 3239.733965][    C0]  ? warn_alloc+0x110/0x110
+[ 3239.737216][    C1]  ? usleep_range+0x170/0x170
+[ 3239.740035][    C0]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3239.744327][    C1]  ? trace_hardirqs_on+0x67/0x240
+[ 3239.748542][    C0]  ? should_fail+0x1de/0x852
+[ 3239.752767][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.758974][    C0]  ? __isolate_free_page+0x4c0/0x4c0
+[ 3239.762940][    C1]  ? __next_timer_interrupt+0x1a0/0x1a0
+[ 3239.767082][    C0]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3239.771461][    C1]  ? swake_up_one+0x60/0x60
+[ 3239.777688][    C0]  ? __kasan_check_read+0x11/0x20
+[ 3239.783897][    C1]  rcu_gp_kthread+0x9b2/0x18c0
+[ 3239.788550][    C0]  __alloc_pages_nodemask+0x630/0x900
+[ 3239.793285][    C1]  ? rcu_barrier+0x310/0x310
+[ 3239.798459][    C0]  ? __kasan_check_read+0x11/0x20
+[ 3239.803530][    C1]  ? trace_hardirqs_on+0x67/0x240
+[ 3239.808524][    C0]  ? __alloc_pages_slowpath+0x2520/0x2520
+[ 3239.813335][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.817978][    C0]  ? lock_downgrade+0x920/0x920
+[ 3239.822452][    C1]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3239.827012][    C0]  cache_grow_begin+0x90/0xd20
+[ 3239.831399][    C1]  ? __kthread_parkme+0x108/0x1c0
+[ 3239.836223][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.839999][    C1]  ? __kasan_check_read+0x11/0x20
+[ 3239.845427][    C0]  ? mempolicy_slab_node+0x139/0x390
+[ 3239.850585][    C1]  kthread+0x361/0x430
+[ 3239.855053][    C0]  fallback_alloc+0x1fd/0x2d0
+[ 3239.860041][    C1]  ? rcu_barrier+0x310/0x310
+[ 3239.864515][    C0]  ____cache_alloc_node+0x1bc/0x1d0
+[ 3239.868987][    C1]  ? kthread_cancel_delayed_work_sync+0x20/0x20
+[ 3239.873105][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3239.877396][    C1]  ret_from_fork+0x24/0x30
+[ 3239.882058][    C0]  kmem_cache_alloc+0x1ef/0x710
+[ 3239.887621][    C1] aoe: skb alloc failure
+[ 3239.893776][    C0]  ? mod_timer+0x50c/0xc10
+[ 3239.898444][    C1] kworker/u4:4: page allocation failure: order:0, mode:0x40a20(GFP_ATOMIC|__GFP_COMP), nodemask=(null),cpuset=/,mems_allowed=0-1
+[ 3239.903665][    C0]  ? __netdev_alloc_skb+0x38a/0x440
+[ 3240.886309][    C0]  __build_skb+0x26/0x70
+[ 3240.890552][    C0]  __netdev_alloc_skb+0x255/0x440
+[ 3240.895572][    C0]  send_hsr_supervision_frame+0x110/0xf20
+[ 3240.901296][    C0]  ? lock_acquire+0x190/0x410
+[ 3240.905961][    C0]  ? hsr_dev_open+0x380/0x380
+[ 3240.910622][    C0]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
+[ 3240.916344][    C0]  hsr_announce+0x12f/0x3b0
+[ 3240.920835][    C0]  call_timer_fn+0x1ac/0x780
+[ 3240.925416][    C0]  ? hsr_dev_open+0x380/0x380
+[ 3240.930072][    C0]  ? msleep_interruptible+0x150/0x150
+[ 3240.935431][    C0]  ? trace_hardirqs_on+0x67/0x240
+[ 3240.940441][    C0]  ? __kasan_check_read+0x11/0x20
+[ 3240.945454][    C0]  ? hsr_dev_open+0x380/0x380
+[ 3240.950105][    C0]  ? hsr_dev_open+0x380/0x380
+[ 3240.954761][    C0]  run_timer_softirq+0x697/0x17a0
+[ 3240.959785][    C0]  ? add_timer+0x930/0x930
+[ 3240.964180][    C0]  ? kvm_clock_read+0x18/0x30
+[ 3240.968860][    C0]  ? sched_clock+0x2e/0x50
+[ 3240.973267][    C0]  ? sched_clock_cpu+0x1b/0x1b0
+[ 3240.978100][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3240.984321][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3240.990553][    C0]  __do_softirq+0x262/0x98c
+[ 3240.995036][    C0]  ? sched_clock_cpu+0x1b/0x1b0
+[ 3240.999871][    C0]  irq_exit+0x19b/0x1e0
+[ 3241.004006][    C0]  smp_apic_timer_interrupt+0x1a3/0x610
+[ 3241.010037][    C0]  apic_timer_interrupt+0xf/0x20
+[ 3241.014959][    C0]  </IRQ>
+[ 3241.017882][    C0] RIP: 0010:console_unlock+0xdab/0xf10
+[ 3241.023359][    C0] Code: 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 30 48 83 3d d2 2f 77 07 00 74 1f e8 5b af 16 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 64 fa ff ff e8 56 be 50 00 e9 0e f5 ff ff e8 3c
+[ 3241.042939][    C0] RSP: 0018:ffff88819f797238 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
+[ 3241.051325][    C0] RAX: 0000000000040000 RBX: 0000000000000200 RCX: ffffc9000ebe7000
+[ 3241.059272][    C0] RDX: 0000000000040000 RSI: ffffffff815bc485 RDI: 0000000000000246
+[ 3241.067222][    C0] RBP: ffff88819f7972c0 R08: ffff888017270080 R09: fffffbfff134af88
+[ 3241.075171][    C0] R10: fffffbfff134af87 R11: ffffffff89a57c3f R12: 0000000000000001
+[ 3241.083115][    C0] R13: ffffffff84335bb0 R14: dffffc0000000000 R15: ffffffff893ca450
+[ 3241.091069][    C0]  ? netconsole_netdev_event+0x2a0/0x2a0
+[ 3241.096681][    C0]  ? console_unlock+0xda5/0xf10
+[ 3241.101517][    C0]  vprintk_emit+0x2a0/0x700
+[ 3241.106011][    C0]  vprintk_default+0x28/0x30
+[ 3241.110576][    C0]  vprintk_func+0x7e/0x189
+[ 3241.114975][    C0]  printk+0xba/0xed
+[ 3241.118766][    C0]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
+[ 3241.124209][    C0]  ? _raw_spin_unlock_irq+0x5e/0x90
+[ 3241.129393][    C0]  dump_unreclaimable_slab.cold+0xde/0xe8
+[ 3241.135094][    C0]  dump_header+0x3f3/0x82d
+[ 3241.139497][    C0]  oom_kill_process.cold+0x10/0x15
+[ 3241.144585][    C0]  out_of_memory+0x79a/0x12c0
+[ 3241.149245][    C0]  ? oom_killer_disable+0x280/0x280
+[ 3241.154420][    C0]  ? mutex_trylock+0x252/0x2d0
+[ 3241.159160][    C0]  ? __alloc_pages_slowpath+0xb69/0x2520
+[ 3241.164770][    C0]  __alloc_pages_slowpath+0x1dde/0x2520
+[ 3241.170301][    C0]  ? __zone_watermark_ok+0x208/0x360
+[ 3241.175743][    C0]  ? warn_alloc+0x110/0x110
+[ 3241.180283][    C0]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3241.186517][    C0]  ? should_fail+0x1de/0x852
+[ 3241.191115][    C0]  ? __kasan_check_read+0x11/0x20
+[ 3241.196118][    C0]  __alloc_pages_nodemask+0x630/0x900
+[ 3241.201465][    C0]  ? __alloc_pages_slowpath+0x2520/0x2520
+[ 3241.207158][    C0]  ? retint_kernel+0x2b/0x2b
+[ 3241.211731][    C0]  ? __sanitizer_cov_trace_const_cmp2+0x18/0x20
+[ 3241.217947][    C0]  alloc_pages_current+0x107/0x210
+[ 3241.223033][    C0]  ? ___might_sleep+0x163/0x280
+[ 3241.227860][    C0]  __vmalloc_node_range+0x4a9/0x7d0
+[ 3241.233052][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3241.239275][    C0]  ? drm_property_create_blob.part.0+0x32/0x320
+[ 3241.245510][    C0]  __vmalloc_node_flags_caller+0x71/0x90
+[ 3241.251119][    C0]  ? drm_property_create_blob.part.0+0x32/0x320
+[ 3241.257350][    C0]  kvmalloc_node+0xdc/0x100
+[ 3241.261836][    C0]  drm_property_create_blob.part.0+0x32/0x320
+[ 3241.267896][    C0]  ? drm_dev_exit+0x60/0x60
+[ 3241.272375][    C0]  drm_mode_createblob_ioctl+0x138/0x480
+[ 3241.277985][    C0]  drm_ioctl_kernel+0x244/0x300
+[ 3241.282813][    C0]  ? drm_mode_getblob_ioctl+0x2d0/0x2d0
+[ 3241.288337][    C0]  ? drm_setversion+0x8a0/0x8a0
+[ 3241.293165][    C0]  ? copy_user_enhanced_fast_string+0xe/0x20
+[ 3241.299118][    C0]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3241.305346][    C0]  ? _copy_from_user+0x12c/0x1a0
+[ 3241.310261][    C0]  drm_ioctl+0x54e/0xa55
+[ 3241.314494][    C0]  ? drm_mode_getblob_ioctl+0x2d0/0x2d0
+[ 3241.320017][    C0]  ? drm_version+0x3d0/0x3d0
+[ 3241.324586][    C0]  ? tomoyo_execute_permission+0x4a0/0x4a0
+[ 3241.330382][    C0]  ? __kasan_check_read+0x11/0x20
+[ 3241.335385][    C0]  ? ___might_sleep+0x163/0x280
+[ 3241.340213][    C0]  ? drm_version+0x3d0/0x3d0
+[ 3241.344777][    C0]  do_vfs_ioctl+0xdb6/0x13e0
+[ 3241.349368][    C0]  ? ioctl_preallocate+0x210/0x210
+[ 3241.354456][    C0]  ? selinux_file_mprotect+0x620/0x620
+[ 3241.359886][    C0]  ? __fget+0x384/0x560
+[ 3241.364990][    C0]  ? ksys_dup3+0x3e0/0x3e0
+[ 3241.369397][    C0]  ? nsecs_to_jiffies+0x30/0x30
+[ 3241.374226][    C0]  ? tomoyo_file_ioctl+0x23/0x30
+[ 3241.379147][    C0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3241.385373][    C0]  ? security_file_ioctl+0x8d/0xc0
+[ 3241.390459][    C0]  ksys_ioctl+0xab/0xd0
+[ 3241.394603][    C0]  __x64_sys_ioctl+0x73/0xb0
+[ 3241.399172][    C0]  do_syscall_64+0xfd/0x6a0
+[ 3241.403670][    C0]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3241.409533][    C0] RIP: 0033:0x459879
+[ 3241.413420][    C0] Code: Bad RIP value.
+[ 3241.417459][    C0] RSP: 002b:00007f0bb48ffc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
+[ 3241.425846][    C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
+[ 3241.433790][    C0] RDX: 0000000020000080 RSI: ffffffffffffffbd RDI: 0000000000000003
+[ 3241.441757][    C0] RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
+[ 3241.449702][    C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0bb49006d4
+[ 3241.457656][    C0] R13: 00000000004c0ca1 R14: 00000000004d3dd8 R15: 00000000ffffffff
diff --git a/pkg/report/testdata/linux/report/493 b/pkg/report/testdata/linux/report/493
new file mode 100644
index 000000000..f05d3763d
--- /dev/null
+++ b/pkg/report/testdata/linux/report/493
@@ -0,0 +1,390 @@
+TITLE: INFO: rcu detected stall in kmem_cache_alloc
+TYPE: HANG
+
+[ 3024.981314] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
+[ 3024.981320] rcu: 	(detected by 1, t=10546 jiffies, g=301501, q=390)
+[ 3024.981335] rcu: All QSes seen, last rcu_preempt kthread activity 10546 (4295239645-4295229099), jiffies_till_next_fqs=1, root ->qsmask 0x0
+[ 3024.981341] syz-executor.1  R  running task    26208 22874  19650 0x8000000e
+[ 3024.984452]  ____cache_alloc_node+0x1be/0x1e0
+[ 3024.988394] Call Trace:
+[ 3024.990705]  kmem_cache_alloc_node+0xe3/0x710
+[ 3025.018694]  <IRQ>
+[ 3025.022497]  __alloc_skb+0xd5/0x5f0
+[ 3025.035320]  sched_show_task.cold+0x292/0x30b
+[ 3025.049517]  ? skb_scrub_packet+0x490/0x490
+[ 3025.060935]  ? set_rq_offline.part.0+0x140/0x140
+[ 3025.076433]  ? check_preemption_disabled+0x48/0x290
+[ 3025.085246]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
+[ 3025.093884]  ? lock_acquire+0x16f/0x3f0
+[ 3025.102697]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3025.111250]  new_skb+0x28/0x1d0
+[ 3025.115027]  rcu_check_callbacks.cold+0xaa1/0xd93
+[ 3025.118454]  aoecmd_cfg+0x1b5/0x640
+[ 3025.123817]  update_process_times+0x32/0x80
+[ 3025.126802]  ? aoecmd_ata_rsp+0x13a0/0x13a0
+[ 3025.129797]  tick_sched_handle+0xa2/0x190
+[ 3025.132885]  ? mod_timer_pending+0x10a0/0x10a0
+[ 3025.136834]  tick_sched_timer+0x47/0x130
+[ 3025.140274]  discover_timer+0x4e/0x60
+[ 3025.143614]  __hrtimer_run_queues+0x33b/0xdd0
+[ 3025.150986]  call_timer_fn+0x18d/0x720
+[ 3025.157372]  ? tick_sched_do_timer+0x1b0/0x1b0
+[ 3025.170003]  ? aoedev_by_aoeaddr.cold+0x83/0x83
+[ 3025.177167]  ? hrtimer_start_range_ns+0xc70/0xc70
+[ 3025.181638]  ? process_timeout+0x40/0x40
+[ 3025.184203]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
+[ 3025.188672]  ? run_timer_softirq+0x647/0x1700
+[ 3025.190800]  ? ktime_get_update_offsets_now+0x2d3/0x440
+[ 3025.194404]  ? trace_hardirqs_on+0x67/0x220
+[ 3025.198879]  hrtimer_interrupt+0x314/0x770
+[ 3025.203172]  ? kasan_check_read+0x11/0x20
+[ 3025.207920]  smp_apic_timer_interrupt+0x111/0x550
+[ 3025.212904]  ? aoedev_by_aoeaddr.cold+0x83/0x83
+[ 3025.217897]  apic_timer_interrupt+0xf/0x20
+[ 3025.221846]  run_timer_softirq+0x652/0x1700
+[ 3025.227362] RIP: 0010:kmem_cache_alloc+0x287/0x700
+[ 3025.230622]  ? add_timer+0xbe0/0xbe0
+[ 3025.235441] Code: 7e 0f 85 db fe ff ff e8 08 35 5f ff e9 d1 fe ff ff e8 3d 1c cf ff 48 83 3d 2d 07 d1 06 00 0f 84 27 03 00 00 48 8b 7d d0 57 9d <0f> 1f 44 00 00 e9 64 fe ff ff 31 d2 be a6 01 00 00 48 c7 c7 02 d6
+[ 3025.239047]  ? __lock_is_held+0xb6/0x140
+[ 3025.243352] RSP: 0018:ffff8880ae907b70 EFLAGS: 00000282
+[ 3025.247666]  __do_softirq+0x25c/0x921
+[ 3025.251870]  ORIG_RAX: ffffffffffffff13
+[ 3025.256434]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3025.260467] RAX: 0000000000000007 RBX: 0000000000480020 RCX: 1ffff11014219d19
+[ 3025.264251]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3025.268717] RDX: 0000000000000000 RSI: ffff8880a10ce8d0 RDI: 0000000000000282
+[ 3025.272589]  irq_exit+0x180/0x1d0
+[ 3025.277137] RBP: ffff8880ae907bd8 R08: ffff8880a10ce000 R09: ffff8880a10ce8c8
+[ 3025.281787]  smp_apic_timer_interrupt+0x13b/0x550
+[ 3025.286599] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
+[ 3025.290640]  apic_timer_interrupt+0xf/0x20
+[ 3025.295630] R13: ffff88821bab2840 R14: 0000000000480020 R15: ffff88821bab2840
+[ 3025.300100]  </IRQ>
+[ 3025.305450]  ? apic_timer_interrupt+0xa/0x20
+[ 3025.309750] RIP: 0010:console_unlock+0xf1b/0x10b0
+[ 3025.313973]  ? mark_held_locks+0xb1/0x100
+[ 3025.318088] Code: fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 ce 00 00 00 48 83 3d 5e e5 1c 07 00 0f 84 b9 00 00 00 e8 ab c5 15 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 35 f9 ff ff 48 8b 7d b0 e8 72 36 4c 00 e9 bc f3
+[ 3025.322921]  ? __netdev_alloc_skb+0x370/0x470
+[ 3025.327561] RSP: 0000:ffff888086a5f188 EFLAGS: 00000293
+[ 3025.331780]  __build_skb+0x3e/0x310
+[ 3025.336068]  ORIG_RAX: ffffffffffffff13
+[ 3025.340991]  __netdev_alloc_skb+0x2ba/0x470
+[ 3025.344678] RAX: ffff888090982540 RBX: 0000000000000200 RCX: 1ffff110121305c1
+[ 3025.363576]  send_hsr_supervision_frame+0x110/0xf30
+[ 3025.367607] RDX: 0000000000000000 RSI: ffffffff815553b5 RDI: 0000000000000293
+[ 3025.372954]  ? lock_acquire+0x16f/0x3f0
+[ 3025.376727] RBP: ffff888086a5f210 R08: ffff888090982540 R09: ffff888090982e08
+[ 3025.380697]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
+[ 3025.386209] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
+[ 3025.393463]  hsr_announce+0x12f/0x3b0
+[ 3025.398974] R13: ffffffff840f8080 R14: 0000000000000015 R15: ffffffff88d6fab0
+[ 3025.406229]  call_timer_fn+0x18d/0x720
+[ 3025.409660]  ? netconsole_netdev_event+0x280/0x280
+[ 3025.416909]  ? send_hsr_supervision_frame+0xf30/0xf30
+[ 3025.421731]  ? console_unlock+0xf15/0x10b0
+[ 3025.429156]  ? process_timeout+0x40/0x40
+[ 3025.433385]  vprintk_emit+0x238/0x690
+[ 3025.440623]  ? run_timer_softirq+0x647/0x1700
+[ 3025.442846]  vprintk_default+0x28/0x30
+[ 3025.447230]  ? trace_hardirqs_on+0x67/0x220
+[ 3025.452049]  vprintk_func+0x7e/0x189
+[ 3025.456174]  ? kasan_check_read+0x11/0x20
+[ 3025.475056]  printk+0xba/0xed
+[ 3025.479617]  ? send_hsr_supervision_frame+0xf30/0xf30
+[ 3025.484957]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
+[ 3025.488563]  run_timer_softirq+0x652/0x1700
+[ 3025.492519]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
+[ 3025.496819]  ? add_timer+0xbe0/0xbe0
+[ 3025.504072]  show_mem+0x16c/0x17b
+[ 3025.509063]  ? __lock_is_held+0xb6/0x140
+[ 3025.516318]  dump_header+0x1ce/0x929
+[ 3025.520295]  __do_softirq+0x25c/0x921
+[ 3025.527549]  ? _raw_spin_unlock_irqrestore+0xa4/0xe0
+[ 3025.532551]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3025.539799]  ? ___ratelimit+0x60/0x595
+[ 3025.539813]  ? do_raw_spin_unlock+0x57/0x270
+[ 3025.543594]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3025.550856]  oom_kill_process.cold+0x10/0x6ef
+[ 3025.554726]  irq_exit+0x180/0x1d0
+[ 3025.559634]  ? lock_downgrade+0x810/0x810
+[ 3025.564851]  smp_apic_timer_interrupt+0x13b/0x550
+[ 3025.569063]  ? kasan_check_read+0x11/0x20
+[ 3025.573117]  apic_timer_interrupt+0xf/0x20
+[ 3025.576896]  out_of_memory+0x936/0x12d0
+[ 3025.581359]  </IRQ>
+[ 3025.585234]  ? oom_killer_disable+0x280/0x280
+[ 3025.589528] RIP: 0010:kmem_cache_alloc+0x287/0x700
+[ 3025.593301]  ? mutex_trylock+0x18e/0x1e0
+[ 3025.597425] Code: 7e 0f 85 db fe ff ff e8 08 35 5f ff e9 d1 fe ff ff e8 3d 1c cf ff 48 83 3d 2d 07 d1 06 00 0f 84 27 03 00 00 48 8b 7d d0 57 9d <0f> 1f 44 00 00 e9 64 fe ff ff 31 d2 be a6 01 00 00 48 c7 c7 02 d6
+[ 3025.600506]  ? __alloc_pages_slowpath+0xcc2/0x2870
+[ 3025.605662] RSP: 0018:ffff888081bbf920 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
+[ 3025.610410]  __alloc_pages_slowpath+0x20b6/0x2870
+[ 3025.614704] RAX: 0000000000000007 RBX: 0000000000480020 RCX: 0000000000000000
+[ 3025.619715]  ? warn_alloc+0x110/0x110
+[ 3025.623402] RDX: 0000000000000000 RSI: ffff8880a10ce880 RDI: 0000000000000282
+[ 3025.623413] RBP: ffff888081bbf988 R08: ffff8880a10ce000 R09: 0000000000000000
+[ 3025.626851]  ? __lock_is_held+0xb6/0x140
+[ 3025.630892] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
+[ 3025.634590]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3025.638361] R13: ffff88821bab2840 R14: 0000000000480020 R15: ffff88821bab2840
+[ 3025.643448]  ? should_fail+0x14d/0x85c
+[ 3025.648971]  ? rcu_read_lock_sched_held+0x110/0x130
+[ 3025.652828]  ? ___might_sleep+0x163/0x280
+[ 3025.657221]  skb_clone+0x156/0x3e0
+[ 3025.662731]  ? __might_sleep+0x95/0x190
+[ 3025.667207]  bpf_clone_redirect+0xb2/0x480
+[ 3025.670637]  __alloc_pages_nodemask+0x621/0x760
+[ 3025.674766]  bpf_prog_3aea14b1f6cd0d8b+0xbdd/0x1000
+[ 3025.679588]  ? __alloc_pages_slowpath+0x2870/0x2870
+[ 3025.683720]  ? mark_held_locks+0x100/0x100
+[ 3025.687926]  ? mark_held_locks+0xb1/0x100
+[ 3025.691880]  ? __schedule+0x815/0x1c70
+[ 3025.694093]  ? cache_grow_begin+0x594/0x8b0
+[ 3025.698568]  ? retint_kernel+0x2d/0x2d
+[ 3025.703479]  ? lockdep_hardirqs_on+0x415/0x5d0
+[ 3025.707531]  ? bpf_test_run+0x146/0x430
+[ 3025.726411]  ? trace_hardirqs_on+0x67/0x220
+[ 3025.731316]  ? find_held_lock+0x35/0x130
+[ 3025.738998]  cache_grow_begin+0x9c/0x8b0
+[ 3025.743818]  ? bpf_test_run+0x146/0x430
+[ 3025.751073]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3025.754850]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3025.762096]  ? __cpuset_node_allowed+0x136/0x540
+[ 3025.769351]  ? check_preemption_disabled+0x48/0x290
+[ 3025.773384]  fallback_alloc+0x1fd/0x2d0
+[ 3025.780638]  ? lock_acquire+0x16f/0x3f0
+[ 3025.786153]  ____cache_alloc_node+0x1be/0x1e0
+[ 3025.793402]  ? kasan_check_read+0x11/0x20
+[ 3025.797293]  kmem_cache_alloc_trace+0x215/0x760
+[ 3025.802285]  ? rcu_dynticks_curr_cpu_in_eqs+0x51/0xb0
+[ 3025.806410]  ? _raw_spin_unlock_irqrestore+0xa4/0xe0
+[ 3025.809942]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3025.813896]  do_syslog+0x9e7/0x1690
+[ 3025.818104]  bpf_test_run+0x10d/0x430
+[ 3025.822767]  ? log_buf_vmcoreinfo_setup+0x120/0x120
+[ 3025.827774]  bpf_prog_test_run_skb+0x64b/0xb20
+[ 3025.832749]  ? try_to_wake_up+0xcc/0xf50
+[ 3025.832762]  ? finish_wait+0x260/0x260
+[ 3025.836998]  ? bpf_test_finish.isra.0+0x1d0/0x1d0
+[ 3025.841126]  ? kmsg_poll+0xb0/0xb0
+[ 3025.845001]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3025.849299]  kmsg_read+0x8f/0xc0
+[ 3025.853163]  ? fput+0x128/0x1a0
+[ 3025.857720]  proc_reg_read+0x1f8/0x2b0
+[ 3025.861676]  ? __bpf_prog_get+0x97/0x290
+[ 3025.865973]  ? proc_reg_unlocked_ioctl+0x2a0/0x2a0
+[ 3025.870013]  ? bpf_test_finish.isra.0+0x1d0/0x1d0
+[ 3025.874053]  __vfs_read+0x114/0x800
+[ 3025.878000]  bpf_prog_test_run+0x129/0x1a0
+[ 3025.883513]  ? proc_reg_unlocked_ioctl+0x2a0/0x2a0
+[ 3025.889035]  __x64_sys_bpf+0x397/0x4c0
+[ 3025.893769]  ? vfs_copy_file_range+0xba0/0xba0
+[ 3025.898768]  ? bpf_prog_get+0x20/0x20
+[ 3025.902719]  ? __inode_security_revalidate+0xda/0x120
+[ 3025.906674]  ? do_syscall_64+0x26/0x620
+[ 3025.911141]  ? avc_policy_seqno+0xd/0x70
+[ 3025.915270]  ? lockdep_hardirqs_on+0x415/0x5d0
+[ 3025.919914]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
+[ 3025.925081]  ? trace_hardirqs_on+0x67/0x220
+[ 3025.930162]  ? security_file_permission+0x89/0x230
+[ 3025.936835]  do_syscall_64+0xfd/0x620
+[ 3025.945913]  ? rw_verify_area+0x118/0x360
+[ 3025.949694]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3025.954686]  vfs_read+0x194/0x3d0
+[ 3025.959244] RIP: 0033:0x459829
+[ 3025.963291]  ksys_read+0x14f/0x2d0
+[ 3025.967241] Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
+[ 3025.972061]  ? kernel_write+0x120/0x120
+[ 3025.975575] RSP: 002b:00007fc6b80edc78 EFLAGS: 00000246
+[ 3025.982607]  ? do_syscall_64+0x26/0x620
+[ 3025.985941]  ORIG_RAX: 0000000000000141
+[ 3025.989210]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3025.993327] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
+[ 3025.997374]  ? do_syscall_64+0x26/0x620
+[ 3025.997394]  __x64_sys_read+0x73/0xb0
+[ 3026.002414] RDX: 000000000000005e RSI: 0000000020000140 RDI: 000000000000000a
+[ 3026.007239]  do_syscall_64+0xfd/0x620
+[ 3026.010839] RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
+[ 3026.015054]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3026.019954] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc6b80ee6d4
+[ 3026.023820] RIP: 0033:0x7fe668eec1fd
+[ 3026.028372] R13: 00000000004bfb92 R14: 00000000004d15b8 R15: 00000000ffffffff
+[ 3026.032160] Code: Bad RIP value.
+[ 3026.037422] rcu: rcu_preempt kthread starved for 10546 jiffies! g301501 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
+[ 3026.041358] RSP: 002b:00007fe66648be30 EFLAGS: 00000293
+[ 3026.045394] rcu: RCU grace-period kthread stack dump:
+[ 3026.049950]  ORIG_RAX: 0000000000000000
+[ 3026.054944] rcu_preempt     R
+[ 3026.059241] RAX: ffffffffffffffda RBX: 00000000023c0650 RCX: 00007fe668eec1fd
+[ 3026.059251] RDX: 0000000000000fff RSI: 00007fe667cc05a0 RDI: 0000000000000004
+[ 3026.064150]   running task    
+[ 3026.067929] RBP: 0000000000000000 R08: 00000000023ab260 R09: 0000000000000000
+[ 3026.072062] 29104    10      2 0x80000000
+[ 3026.077305] R10: 6b205d3437373530 R11: 0000000000000293 R12: 000000000065e420
+[ 3026.077315] R13: 00007fe66648c9c0 R14: 00007fe669531040 R15: 0000000000000003
+[ 3026.080741] Call Trace:
+[ 3026.083982] aoe: skb alloc failure
+[ 3026.087440]  __schedule+0x80d/0x1c70
+[ 3026.106360] rsyslogd: page allocation failure: order:0, mode:0x484020(GFP_ATOMIC|__GFP_COMP), nodemask=(null)
+[ 3026.110278]  ? pci_mmcfg_check_reserved+0x170/0x170
+[ 3026.115619] rsyslogd cpuset=
+[ 3026.119580]  ? _raw_spin_unlock_irqrestore+0x6b/0xe0
+[ 3026.123519] /
+[ 3026.128871]  ? lockdep_hardirqs_on+0x415/0x5d0
+[ 3026.136111]  mems_allowed=0-1
+[ 3026.140074]  ? trace_hardirqs_on+0x67/0x220
+[ 3026.143849] CPU: 0 PID: 7437 Comm: rsyslogd Not tainted 4.19.60 #33
+[ 3026.151201]  schedule+0x92/0x1c0
+[ 3026.154973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[ 3026.162226]  schedule_timeout+0x4db/0xfc0
+[ 3026.167475] Call Trace:
+[ 3026.174737]  ? usleep_range+0x170/0x170
+[ 3026.178415]  <IRQ>
+[ 3026.185670]  ? trace_hardirqs_on+0x67/0x220
+[ 3026.189012]  dump_stack+0x172/0x1f0
+[ 3026.199561]  ? kasan_check_read+0x11/0x20
+[ 3026.204904]  warn_alloc.cold+0x7b/0x173
+[ 3026.210072]  ? __next_timer_interrupt+0x1a0/0x1a0
+[ 3026.214020]  ? zone_watermark_ok_safe+0x260/0x260
+[ 3026.217104]  ? prepare_to_swait_exclusive+0x120/0x120
+[ 3026.224353]  ? wakeup_kcompactd+0x21f/0x550
+[ 3026.231953]  rcu_gp_kthread+0xd5c/0x2190
+[ 3026.235124]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3026.242397]  ? rcu_blocking_is_gp+0x90/0x90
+[ 3026.246506]  ? __cpuset_node_allowed+0x136/0x540
+[ 3026.253756]  ? trace_hardirqs_on+0x67/0x220
+[ 3026.261009]  ? __isolate_free_page+0x4c0/0x4c0
+[ 3026.263566]  ? kasan_check_read+0x11/0x20
+[ 3026.267084]  ? wake_all_kswapds+0x14d/0x300
+[ 3026.270774]  ? _raw_spin_unlock_irqrestore+0xa4/0xe0
+[ 3026.280804]  __alloc_pages_slowpath+0x2215/0x2870
+[ 3026.285797]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3026.288806]  ? warn_alloc+0x110/0x110
+[ 3026.293872]  ? __kthread_parkme+0xfb/0x1b0
+[ 3026.295568]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3026.300130]  kthread+0x354/0x420
+[ 3026.303221]  ? should_fail+0x14d/0x85c
+[ 3026.307516]  ? rcu_blocking_is_gp+0x90/0x90
+[ 3026.313897]  ? __isolate_free_page+0x4c0/0x4c0
+[ 3026.317264]  ? kthread_cancel_delayed_work_sync+0x20/0x20
+[ 3026.326605]  __alloc_pages_nodemask+0x621/0x760
+[ 3026.330730]  ret_from_fork+0x24/0x30
+[ 3026.333297]  ? __alloc_pages_slowpath+0x2870/0x2870
+[ 3026.337417] syz-executor.1: page allocation failure: order:0, mode:0x484020(GFP_ATOMIC|__GFP_COMP), nodemask=(null)
+[ 3026.339402]  cache_grow_begin+0x9c/0x8b0
+[ 3026.343685] syz-executor.1 cpuset=
+[ 3026.347298]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3026.351411] syz1
+[ 3026.355370]  ? __cpuset_node_allowed+0x136/0x540
+[ 3026.360186]  mems_allowed=0-1
+[ 3026.365269]  fallback_alloc+0x1fd/0x2d0
+[ 3026.511827]  ____cache_alloc_node+0x1be/0x1e0
+[ 3026.516322]  kmem_cache_alloc_node+0xe3/0x710
+[ 3026.520821]  __alloc_skb+0xd5/0x5f0
+[ 3026.524444]  ? skb_scrub_packet+0x490/0x490
+[ 3026.528764]  ? check_preemption_disabled+0x48/0x290
+[ 3026.533771]  ? lock_acquire+0x16f/0x3f0
+[ 3026.537743]  new_skb+0x28/0x1d0
+[ 3026.541020]  aoecmd_cfg+0x1b5/0x640
+[ 3026.544643]  ? aoecmd_ata_rsp+0x13a0/0x13a0
+[ 3026.548980]  ? mod_timer_pending+0x10a0/0x10a0
+[ 3026.553564]  discover_timer+0x4e/0x60
+[ 3026.557357]  call_timer_fn+0x18d/0x720
+[ 3026.561250]  ? aoedev_by_aoeaddr.cold+0x83/0x83
+[ 3026.565912]  ? process_timeout+0x40/0x40
+[ 3026.569963]  ? run_timer_softirq+0x647/0x1700
+[ 3026.574457]  ? trace_hardirqs_on+0x67/0x220
+[ 3026.578772]  ? kasan_check_read+0x11/0x20
+[ 3026.582926]  ? aoedev_by_aoeaddr.cold+0x83/0x83
+[ 3026.587587]  run_timer_softirq+0x652/0x1700
+[ 3026.591910]  ? add_timer+0xbe0/0xbe0
+[ 3026.595706]  ? __lock_is_held+0xb6/0x140
+[ 3026.599773]  __do_softirq+0x25c/0x921
+[ 3026.603568]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3026.609103]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
+[ 3026.614646]  irq_exit+0x180/0x1d0
+[ 3026.618095]  smp_apic_timer_interrupt+0x13b/0x550
+[ 3026.622937]  apic_timer_interrupt+0xf/0x20
+[ 3026.627161]  </IRQ>
+[ 3026.629396] RIP: 0010:console_unlock+0xf1b/0x10b0
+[ 3026.634233] Code: fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 ce 00 00 00 48 83 3d 5e e5 1c 07 00 0f 84 b9 00 00 00 e8 ab c5 15 00 48 8b 7d 98 57 9d <0f> 1f 44 00 00 e9 35 f9 ff ff 48 8b 7d b0 e8 72 36 4c 00 e9 bc f3
+[ 3026.653234] RSP: 0000:ffff888086a5f188 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
+[ 3026.660937] RAX: ffff888090982540 RBX: 0000000000000200 RCX: 1ffff110121305c1
+[ 3026.668203] RDX: 0000000000000000 RSI: ffffffff815553b5 RDI: 0000000000000293
+[ 3026.675472] RBP: ffff888086a5f210 R08: ffff888090982540 R09: ffff888090982e08
+[ 3026.683015] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
+[ 3026.690278] R13: ffffffff840f8080 R14: 0000000000000015 R15: ffffffff88d6fab0
+[ 3026.697557]  ? netconsole_netdev_event+0x280/0x280
+[ 3026.702486]  ? console_unlock+0xf15/0x10b0
+[ 3026.706738]  vprintk_emit+0x238/0x690
+[ 3026.710541]  vprintk_default+0x28/0x30
+[ 3026.714421]  vprintk_func+0x7e/0x189
+[ 3026.718133]  printk+0xba/0xed
+[ 3026.721234]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
+[ 3026.726001]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
+[ 3026.731025]  show_mem+0x16c/0x17b
+[ 3026.734480]  dump_header+0x1ce/0x929
+[ 3026.738193]  ? _raw_spin_unlock_irqrestore+0xa4/0xe0
+[ 3026.743293]  ? ___ratelimit+0x60/0x595
+[ 3026.747172]  ? do_raw_spin_unlock+0x57/0x270
+[ 3026.752015]  oom_kill_process.cold+0x10/0x6ef
+[ 3026.756506]  ? lock_downgrade+0x810/0x810
+[ 3026.760655]  ? kasan_check_read+0x11/0x20
+[ 3026.764800]  out_of_memory+0x936/0x12d0
+[ 3026.768775]  ? oom_killer_disable+0x280/0x280
+[ 3026.773267]  ? mutex_trylock+0x18e/0x1e0
+[ 3026.777323]  ? __alloc_pages_slowpath+0xcc2/0x2870
+[ 3026.782255]  __alloc_pages_slowpath+0x20b6/0x2870
+[ 3026.787111]  ? warn_alloc+0x110/0x110
+[ 3026.790904]  ? __lock_is_held+0xb6/0x140
+[ 3026.795051]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
+[ 3026.800593]  ? should_fail+0x14d/0x85c
+[ 3026.804494]  ? ___might_sleep+0x163/0x280
+[ 3026.808647]  ? __might_sleep+0x95/0x190
+[ 3026.812617]  __alloc_pages_nodemask+0x621/0x760
+[ 3026.817286]  ? __alloc_pages_slowpath+0x2870/0x2870
+[ 3026.822298]  ? mark_held_locks+0xb1/0x100
+[ 3026.826444]  ? cache_grow_begin+0x594/0x8b0
+[ 3026.830759]  ? lockdep_hardirqs_on+0x415/0x5d0
+[ 3026.835340]  ? trace_hardirqs_on+0x67/0x220
+[ 3026.839658]  cache_grow_begin+0x9c/0x8b0
+[ 3026.843717]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
+[ 3026.849250]  ? __cpuset_node_allowed+0x136/0x540
+[ 3026.854007]  fallback_alloc+0x1fd/0x2d0
+[ 3026.857990]  ____cache_alloc_node+0x1be/0x1e0
+[ 3026.862482]  kmem_cache_alloc_trace+0x215/0x760
+[ 3026.867146]  ? _raw_spin_unlock_irqrestore+0xa4/0xe0
+[ 3026.872259]  do_syslog+0x9e7/0x1690
+[ 3026.875888]  ? log_buf_vmcoreinfo_setup+0x120/0x120
+[ 3026.880904]  ? try_to_wake_up+0xcc/0xf50
+[ 3026.884959]  ? finish_wait+0x260/0x260
+[ 3026.888853]  ? kmsg_poll+0xb0/0xb0
+[ 3026.892420]  kmsg_read+0x8f/0xc0
+[ 3026.895788]  proc_reg_read+0x1f8/0x2b0
+[ 3026.899674]  ? proc_reg_unlocked_ioctl+0x2a0/0x2a0
+[ 3026.904606]  __vfs_read+0x114/0x800
+[ 3026.908229]  ? proc_reg_unlocked_ioctl+0x2a0/0x2a0
+[ 3026.913154]  ? vfs_copy_file_range+0xba0/0xba0
+[ 3026.917738]  ? __inode_security_revalidate+0xda/0x120
+[ 3026.922921]  ? avc_policy_seqno+0xd/0x70
+[ 3026.926975]  ? __sanitizer_cov_trace_cmp4+0x16/0x20
+[ 3026.931994]  ? security_file_permission+0x89/0x230
+[ 3026.936921]  ? rw_verify_area+0x118/0x360
+[ 3026.941068]  vfs_read+0x194/0x3d0
+[ 3026.944540]  ksys_read+0x14f/0x2d0
+[ 3026.948077]  ? kernel_write+0x120/0x120
+[ 3026.952047]  ? do_syscall_64+0x26/0x620
+[ 3026.956024]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3026.961384]  ? do_syscall_64+0x26/0x620
+[ 3026.965358]  __x64_sys_read+0x73/0xb0
+[ 3026.969157]  do_syscall_64+0xfd/0x620
+[ 3026.972954]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
+[ 3026.978139] RIP: 0033:0x7fe668eec1fd
+[ 3026.982612] Code: Bad RIP value.
+[ 3026.985969] RSP: 002b:00007fe66648be30 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
+[ 3026.993671] RAX: ffffffffffffffda RBX: 00000000023c0650 RCX: 00007fe668eec1fd
+[ 3027.000934] RDX: 0000000000000fff RSI: 00007fe667cc05a0 RDI: 0000000000000004
+[ 3027.008454] RBP: 0000000000000000 R08: 00000000023ab260 R09: 0000000000000000
+[ 3027.015718] R10: 6b205d3437373530 R11: 0000000000000293 R12: 000000000065e420
+[ 3027.023001] R13: 00007fe66648c9c0 R14: 00007fe669531040 R15: 0000000000000003
+[ 3027.030282] warn_alloc_show_mem: 1 callbacks suppressed
diff --git a/pkg/report/testdata/linux/report/494 b/pkg/report/testdata/linux/report/494
new file mode 100644
index 000000000..e47b79aec
--- /dev/null
+++ b/pkg/report/testdata/linux/report/494
@@ -0,0 +1,157 @@
+TITLE: INFO: rcu detected stall in br_handle_frame
+TYPE: HANG
+
+[  421.679143] INFO: rcu_sched self-detected stall on CPU
+[  421.684601] 	0-...: (10496 ticks this GP) idle=af1/140000000000001/0 softirq=11112/11144 fqs=2387 
+[  421.693677] 	 (t=10500 jiffies g=3533 c=3532 q=77)
+[  421.698806] Task dump for CPU 0:
+[  421.702163] syz-executor2   R  running task    27992  3917   3903 0x0000000a
+[  421.709658]  ffff8801c8f48000 ffff8801db606830 ffffffff813ebb96 1ffff1003b6c3ebf
+[  421.717726]  ffff8801db61ecc0 0000000000000000 dffffc0000000000 ffffffff832dce80
+[  421.725797]  ffffffff832dcf04 ffff8801db606840 ffffffff813ebbb2 ffff8801db606860
+[  421.733874] Call Trace:
+[  421.736446]  <IRQ>  [<ffffffff813ebb96>] _sched_show_task+0x2d0/0x2dc
+[  421.743205]  [<ffffffff813ebbb2>] sched_show_task+0x10/0x12
+[  421.748904]  [<ffffffff813ebced>] dump_cpu_task+0x7e/0x83
+[  421.754436]  [<ffffffff813f1918>] rcu_dump_cpu_stacks+0x155/0x169
+[  421.760756]  [<ffffffff813f22ff>] rcu_check_callbacks.cold.83+0x5f5/0xc05
+[  421.767673]  [<ffffffff8125d53f>] update_process_times+0x3f/0x70
+[  421.773809]  [<ffffffff8128743a>] tick_sched_handle.isra.17+0x5a/0xf0
+[  421.780381]  [<ffffffff81287c57>] tick_sched_timer+0x77/0x130
+[  421.786259]  [<ffffffff81287be0>] ? tick_sched_do_timer+0xa0/0xa0
+[  421.792486]  [<ffffffff812606cc>] __hrtimer_run_queues+0x36c/0xda0
+[  421.798811]  [<ffffffff81260360>] ? retrigger_next_event+0x180/0x180
+[  421.805296]  [<ffffffff810ac255>] ? kvm_clock_read+0x25/0x30
+[  421.811106]  [<ffffffff810ac269>] ? kvm_clock_get_cycles+0x9/0x10
+[  421.817328]  [<ffffffff81261a88>] ? hrtimer_interrupt+0x108/0x3f0
+[  421.823551]  [<ffffffff81261b0b>] hrtimer_interrupt+0x18b/0x3f0
+[  421.829610]  [<ffffffff8297ade8>] ? br_nf_dev_queue_xmit+0x328/0x1460
+[  421.836179]  [<ffffffff810911aa>] local_apic_timer_interrupt+0x7a/0xa0
+[  421.842845]  [<ffffffff82a61701>] smp_apic_timer_interrupt+0x81/0xb0
+[  421.849350]  [<ffffffff82a5fb00>] apic_timer_interrupt+0xa0/0xb0
+[  421.855486]  [<ffffffff8297ade8>] ? br_nf_dev_queue_xmit+0x328/0x1460
+[  421.862060]  [<ffffffff82a5e216>] ? _raw_spin_unlock_irqrestore+0x56/0x60
+[  421.868975]  [<ffffffff814e8e69>] __slab_free+0x129/0x270
+[  421.874506]  [<ffffffff814e97e5>] ? kfree+0xd5/0x2d0
+[  421.879619]  [<ffffffff8297ade8>] ? br_nf_dev_queue_xmit+0x328/0x1460
+[  421.886198]  [<ffffffff8297ade8>] ? br_nf_dev_queue_xmit+0x328/0x1460
+[  421.892767]  [<ffffffff814e9962>] kfree+0x252/0x2d0
+[  421.897777]  [<ffffffff8297ade8>] br_nf_dev_queue_xmit+0x328/0x1460
+[  421.904192]  [<ffffffff8297c943>] br_nf_post_routing+0xa23/0xda0
+[  421.910328]  [<ffffffff828e000a>] ? _decode_session6+0xc3a/0x1190
+[  421.916551]  [<ffffffff8297bf20>] ? br_nf_dev_queue_xmit+0x1460/0x1460
+[  421.923216]  [<ffffffff81012f43>] ? print_context_stack+0x63/0x130
+[  421.929525]  [<ffffffff8298ea2a>] ? ebt_nat_in+0x6a/0x80
+[  421.934966]  [<ffffffff823e3907>] nf_iterate+0x187/0x210
+[  421.940411]  [<ffffffff823e3b45>] nf_hook_slow+0x1b5/0x330
+[  421.946024]  [<ffffffff823e3995>] ? nf_hook_slow+0x5/0x330
+[  421.951648]  [<ffffffff823e3990>] ? nf_iterate+0x210/0x210
+[  421.957287]  [<ffffffff823e3b78>] ? nf_hook_slow+0x1e8/0x330
+[  421.963077]  [<ffffffff82949ce7>] br_forward_finish+0x167/0x1b0
+[  421.969124]  [<ffffffff82949b80>] ? br_multicast_flood+0x490/0x490
+[  421.975433]  [<ffffffff82948e50>] ? deliver_clone+0xc0/0xc0
+[  421.981174]  [<ffffffff829769fc>] br_nf_forward_finish+0x2cc/0x780
+[  421.987517]  [<ffffffff82976730>] ? brnf_get_logical_dev.isra.23+0x1e0/0x1e0
+[  421.994693]  [<ffffffff82949b80>] ? br_multicast_flood+0x490/0x490
+[  422.001010]  [<ffffffff8123f0b9>] ? rcu_read_lock_held+0xa9/0xc0
+[  422.007146]  [<ffffffff82977842>] br_nf_forward_ip+0x482/0x10a0
+[  422.013204]  [<ffffffff829773c0>] ? br_nf_push_frag_xmit+0x510/0x510
+[  422.019690]  [<ffffffff82976730>] ? brnf_get_logical_dev.isra.23+0x1e0/0x1e0
+[  422.026867]  [<ffffffff823e3907>] nf_iterate+0x187/0x210
+[  422.032306]  [<ffffffff823e3b45>] nf_hook_slow+0x1b5/0x330
+[  422.037921]  [<ffffffff823e3995>] ? nf_hook_slow+0x5/0x330
+[  422.043535]  [<ffffffff823e3990>] ? nf_iterate+0x210/0x210
+[  422.049170]  [<ffffffff81203f67>] ? mark_held_locks+0xc7/0x130
+[  422.055152]  [<ffffffff8294a04d>] __br_forward+0x31d/0x400
+[  422.060777]  [<ffffffff82949d30>] ? br_forward_finish+0x1b0/0x1b0
+[  422.066997]  [<ffffffff822678f0>] ? __copy_skb_header+0x2b0/0x370
+[  422.073218]  [<ffffffff82949b80>] ? br_multicast_flood+0x490/0x490
+[  422.079528]  [<ffffffff82949d30>] ? br_forward_finish+0x1b0/0x1b0
+[  422.085758]  [<ffffffff82948df4>] deliver_clone+0x64/0xc0
+[  422.091311]  [<ffffffff82949d30>] ? br_forward_finish+0x1b0/0x1b0
+[  422.097544]  [<ffffffff829494bd>] maybe_deliver+0xfd/0x140
+[  422.103179]  [<ffffffff8294960f>] br_flood+0x10f/0x1f0
+[  422.108454]  [<ffffffff82949d30>] ? br_forward_finish+0x1b0/0x1b0
+[  422.114682]  [<ffffffff8294a69a>] br_flood_forward+0x3a/0x50
+[  422.120473]  [<ffffffff8294d728>] br_handle_frame_finish+0xb38/0x1b50
+[  422.127051]  [<ffffffff8294cbf0>] ? br_handle_local_finish+0x200/0x200
+[  422.133718]  [<ffffffff823e3ba1>] ? nf_hook_slow+0x211/0x330
+[  422.139504]  [<ffffffff823e3995>] ? nf_hook_slow+0x5/0x330
+[  422.145118]  [<ffffffff823e3990>] ? nf_iterate+0x210/0x210
+[  422.150734]  [<ffffffff811fee02>] ? __lock_is_held+0xa2/0xf0
+[  422.156523]  [<ffffffff8297e957>] br_nf_pre_routing_finish_ipv6+0x6a7/0xec0
+[  422.163619]  [<ffffffff8297e2b0>] ? br_nf_pre_routing+0x1040/0x1040
+[  422.170041]  [<ffffffff8294cbf0>] ? br_handle_local_finish+0x200/0x200
+[  422.176695]  [<ffffffff8297d057>] ? setup_pre_routing+0x207/0x420
+[  422.182921]  [<ffffffff829801f7>] br_nf_pre_routing_ipv6+0x397/0x520
+[  422.189412]  [<ffffffff8297fe60>] ? br_validate_ipv6+0xcf0/0xcf0
+[  422.195720]  [<ffffffff8297e2b0>] ? br_nf_pre_routing+0x1040/0x1040
+[  422.202120]  [<ffffffff822672d6>] ? skb_pull_rcsum+0x136/0x2c0
+[  422.208086]  [<ffffffff8297db32>] br_nf_pre_routing+0x8c2/0x1040
+[  422.214226]  [<ffffffff8297d270>] ? setup_pre_routing+0x420/0x420
+[  422.220453]  [<ffffffff82263690>] ? kfree_skbmem+0xf0/0x110
+[  422.226157]  [<ffffffff823e3907>] nf_iterate+0x187/0x210
+[  422.231629]  [<ffffffff823e3b45>] nf_hook_slow+0x1b5/0x330
+[  422.237244]  [<ffffffff823e3995>] ? nf_hook_slow+0x5/0x330
+[  422.242862]  [<ffffffff823e3990>] ? nf_iterate+0x210/0x210
+[  422.248485]  [<ffffffff8298e590>] ? broute_net_init+0x80/0x80
+[  422.254361]  [<ffffffff8294ee72>] br_handle_frame+0x732/0xca0
+[  422.260237]  [<ffffffff8294e740>] ? br_handle_frame_finish+0x1b50/0x1b50
+[  422.267082]  [<ffffffff8294cbf0>] ? br_handle_local_finish+0x200/0x200
+[  422.273748]  [<ffffffff8294e740>] ? br_handle_frame_finish+0x1b50/0x1b50
+[  422.280583]  [<ffffffff822ac6a4>] __netif_receive_skb_core+0x7b4/0x27e0
+[  422.287334]  [<ffffffff822abef0>] ? dev_cpu_callback+0x670/0x670
+[  422.293474]  [<ffffffff81203f67>] ? mark_held_locks+0xc7/0x130
+[  422.299438]  [<ffffffff822ae730>] __netif_receive_skb+0x60/0x1c0
+[  422.305573]  [<ffffffff822b2a3d>] process_backlog+0x21d/0x6a0
+[  422.311448]  [<ffffffff822b29d7>] ? process_backlog+0x1b7/0x6a0
+[  422.317497]  [<ffffffff822af9f9>] net_rx_action+0x2d9/0xc50
+[  422.323213]  [<ffffffff82a5e1ac>] ? _raw_spin_unlock_irq+0x2c/0x40
+[  422.329530]  [<ffffffff822af720>] ? napi_complete_done+0x200/0x200
+[  422.335852]  [<ffffffff811fee02>] ? __lock_is_held+0xa2/0xf0
+[  422.341643]  [<ffffffff82a61f21>] __do_softirq+0x231/0x9f2
+[  422.347265]  [<ffffffff82402586>] ? nf_ct_iterate_cleanup+0xe6/0x520
+[  422.353748]  [<ffffffff82a6097c>] do_softirq_own_stack+0x1c/0x30
+[  422.359880]  <EOI>  [<ffffffff8111a3f9>] do_softirq.part.17+0x59/0x60
+[  422.366593]  [<ffffffff8111a4b9>] __local_bh_enable_ip+0xb9/0xc0
+[  422.372739]  [<ffffffff824025ad>] nf_ct_iterate_cleanup+0x10d/0x520
+[  422.379140]  [<ffffffff8278cc10>] ? help+0x630/0x630
+[  422.384240]  [<ffffffff825c3507>] ? ip_vs_dst_event+0x1a7/0x650
+[  422.390289]  [<ffffffff8278ce1d>] masq_device_event+0xad/0xe0
+[  422.396165]  [<ffffffff81171dce>] notifier_call_chain+0xbe/0x1f0
+[  422.402306]  [<ffffffff81171f82>] raw_notifier_call_chain+0x32/0x40
+[  422.408707]  [<ffffffff82299f9a>] call_netdevice_notifiers_info+0x5a/0x70
+[  422.415629]  [<ffffffff8229aa8f>] dev_close_many+0x24f/0x360
+[  422.421418]  [<ffffffff8229a840>] ? __dev_close_many+0x260/0x260
+[  422.427554]  [<ffffffff81158384>] ? __queue_work+0x414/0xe00
+[  422.433345]  [<ffffffff822a03f4>] rollback_registered_many+0x264/0x750
+[  422.440006]  [<ffffffff82a5e101>] ? _raw_spin_unlock+0x1/0x40
+[  422.445880]  [<ffffffff822a0190>] ? netdev_rx_handler_unregister+0x90/0x90
+[  422.452885]  [<ffffffff81203f67>] ? mark_held_locks+0xc7/0x130
+[  422.458857]  [<ffffffff8115a826>] ? queue_delayed_work_on+0xa6/0xc0
+[  422.465253]  [<ffffffff822a095e>] rollback_registered+0x7e/0xa0
+[  422.471301]  [<ffffffff822a08e0>] ? rollback_registered_many+0x750/0x750
+[  422.478133]  [<ffffffff822f4c68>] ? linkwatch_schedule_work+0x108/0x130
+[  422.484876]  [<ffffffff822f50f1>] ? linkwatch_fire_event+0x91/0x110
+[  422.491276]  [<ffffffff822a35c6>] unregister_netdevice_queue+0x86/0x120
+[  422.498019]  [<ffffffff8208ca49>] __tun_detach+0x839/0xa20
+[  422.503647]  [<ffffffff8208cc30>] ? __tun_detach+0xa20/0xa20
+[  422.509469]  [<ffffffff8208cc79>] tun_chr_close+0x49/0x60
+[  422.515021]  [<ffffffff8153628d>] __fput+0x23d/0x780
+[  422.520117]  [<ffffffff8153685a>] ____fput+0x1a/0x20
+[  422.525215]  [<ffffffff81169754>] task_work_run+0x114/0x190
+[  422.530915]  [<ffffffff81115f42>] do_exit+0x9f2/0x26e0
+[  422.536190]  [<ffffffff81204570>] ? trace_hardirqs_on+0x10/0x10
+[  422.542242]  [<ffffffff81115550>] ? mm_update_next_owner+0x660/0x660
+[  422.548725]  [<ffffffff81130408>] ? recalc_sigpending+0x78/0xa0
+[  422.554785]  [<ffffffff81117db6>] do_group_exit+0x116/0x340
+[  422.560499]  [<ffffffff8113a8f1>] get_signal+0x4f1/0x1460
+[  422.566033]  [<ffffffff8100b5a2>] do_signal+0x92/0x18f0
+[  422.571394]  [<ffffffff8100b510>] ? setup_sigcontext+0x780/0x780
+[  422.577531]  [<ffffffff81204570>] ? trace_hardirqs_on+0x10/0x10
+[  422.583579]  [<ffffffff812930da>] ? SyS_futex+0x26a/0x360
+[  422.589122]  [<ffffffff81292e70>] ? do_futex+0x1830/0x1830
+[  422.594743]  [<ffffffff81002a03>] ? exit_to_usermode_loop+0x93/0x140
+[  422.601227]  [<ffffffff81002a34>] exit_to_usermode_loop+0xc4/0x140
+[  422.607536]  [<ffffffff8100545e>] syscall_return_slowpath+0x1be/0x1f0
+[  422.614108]  [<ffffffff82a5ed79>] int_ret_from_sys_call+0x25/0xa3
diff --git a/pkg/report/testdata/linux/report/495 b/pkg/report/testdata/linux/report/495
new file mode 100644
index 000000000..2cd97b624
--- /dev/null
+++ b/pkg/report/testdata/linux/report/495
@@ -0,0 +1,61 @@
+TITLE: INFO: rcu detected stall in kvm_mux_dev_ioctl
+TYPE: HANG
+
+[  785.972629] rcu: INFO: rcu_sched self-detected stall on CPU
+[  785.978598] rcu: 	0-....: (10499 ticks this GP) idle=ad6/1/0x4000000000000002 softirq=74488/74499 fqs=5208 
+[  785.988667] rcu: 	 (t=10501 jiffies g=83477 q=2399)
+[  785.993688] NMI backtrace for cpu 0
+[  785.997313] CPU: 0 PID: 24585 Comm: syz-executor.5 Not tainted 4.15.0-syzkaller #0
+[  786.005023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  786.014453] Call Trace:
+[  786.017030]  <IRQ>
+[  786.019176]  [<ffffffff84528ac6>] dump_stack+0xe1/0x15b
+[  786.024529]  [<ffffffff81388601>] ? lapic_can_unplug_cpu.cold+0x19/0x38
+[  786.031288]  [<ffffffff8453554a>] nmi_cpu_backtrace.cold+0x18/0xb3
+[  786.037593]  [<ffffffff81388620>] ? lapic_can_unplug_cpu.cold+0x38/0x38
+[  786.044330]  [<ffffffff84535506>] nmi_trigger_cpumask_backtrace+0x1a6/0x1d2
+[  786.051415]  [<ffffffff81388724>] arch_trigger_cpumask_backtrace+0x14/0x20
+[  786.058428]  [<ffffffff8162e11d>] rcu_dump_cpu_stacks+0x183/0x1cf
+[  786.064642]  [<ffffffff82229277>] ? find_next_bit+0x107/0x130
+[  786.070509]  [<ffffffff8162f191>] rcu_sched_clock_irq.cold+0x4d7/0x8a8
+[  786.077173]  [<ffffffff8142b293>] ? raise_softirq+0x183/0x240
+[  786.085233]  [<ffffffff8164dda2>] update_process_times+0x32/0x80
+[  786.091377]  [<ffffffff8167fd70>] tick_sched_handle+0xa0/0x180
+[  786.097339]  [<ffffffff81680364>] tick_sched_timer+0x44/0x130
+[  786.103384]  [<ffffffff816519eb>] __hrtimer_run_queues+0x33b/0xd10
+[  786.109687]  [<ffffffff81680320>] ? tick_sched_do_timer+0x110/0x110
+[  786.116077]  [<ffffffff816516b0>] ? hrtimer_fixup_activate+0x30/0x30
+[  786.123527]  [<ffffffff816533fa>] hrtimer_interrupt+0x2ea/0x730
+[  786.129592]  [<ffffffff84604a69>] smp_apic_timer_interrupt+0x159/0x580
+[  786.136239]  [<ffffffff846019a3>] apic_timer_interrupt+0x93/0xa0
+[  786.142379]  </IRQ>
+[  786.144599] RIP: 0010:qlist_free_all+0x4e/0x100
+[  786.149244] RSP: 0018:ffff88017c477bd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12
+[  786.156975] RAX: 0000000000000000 RBX: 0000000000000282 RCX: ffffea000615195f
+[  786.164228] RDX: 0000000000000000 RSI: ffff8801854668c0 RDI: 0000000000000007
+[  786.171477] RBP: ffff88017c477c08 R08: ffff8801d7b52240 R09: 0000000000000000
+[  786.178998] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880185466e00
+[  786.186335] R13: 0000000000000000 R14: ffff880185466380 R15: ffff8801d91e38c0
+[  786.193615]  [<ffffffff81ad6427>] quarantine_reduce+0x167/0x1a0
+[  786.199656]  [<ffffffff81ad4ae0>] kasan_kmalloc+0xa0/0xf0
+[  786.205190]  [<ffffffff81ad4f4f>] kasan_slab_alloc+0xf/0x20
+[  786.210882]  [<ffffffff81acf498>] kmem_cache_alloc_trace+0x678/0x7a0
+[  786.217358]  [<ffffffff81feb2d5>] ? __debugfs_create_file+0x2f5/0x3e0
+[  786.223924]  [<ffffffff810974dc>] kvm_dev_ioctl+0x8cc/0x1980
+[  786.229875]  [<ffffffff81016e30>] ? trace_hardirqs_on_thunk+0x1a/0x1c
+[  786.236443]  [<ffffffff81096c10>] ? kvm_unregister_device_ops+0x60/0x60
+[  786.243181]  [<ffffffff81cb20ab>] ? compat_SyS_ioctl+0x9b/0x3260
+[  786.249309]  [<ffffffff81075526>] kvm_mux_dev_ioctl+0x26/0x30
+[  786.255261]  [<ffffffff81075500>] ? kvm_mux_dev_open+0x160/0x160
+[  786.261387]  [<ffffffff81cb214a>] compat_SyS_ioctl+0x13a/0x3260
+[  786.267440]  [<ffffffff81cb2010>] ? do_ioctl+0x70/0x70
+[  786.272697]  [<ffffffff8101cf74>] do_fast_syscall_32+0x354/0xcfd
+[  786.278819]  [<ffffffff81016e4c>] ? trace_hardirqs_off_thunk+0x1a/0x1c
+[  786.285477]  [<ffffffff846017f0>] entry_SYSENTER_compat+0x70/0x7f
+[  786.291686] RIP: 0023:0xf7fb4c59
+[  786.295045] RSP: 002b:00000000f5db00cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036
+[  786.302907] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000000ae01
+[  786.310172] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
+[  786.317422] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
+[  786.324689] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
+[  786.331938] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
author	Dmitry Vyukov <dvyukov@google.com>	2020-06-02 17:46:27 +0200
committer	Dmitry Vyukov <dvyukov@google.com>	2020-06-02 17:47:56 +0200
commit	06417ff86899b45658b5c02e3a329ee747717498 (patch)
tree	18a0338edf1a152a9c20a16126fe7d8ab096c4c1 /pkg
parent	c98aaf984a8f6f5af4dd2601ec735bf4d9df34b4 (diff)