pkg/report: improve corrupted report detection

Detect informational kernel reports that are not bugs in itself,
but contain stack traces. If we see them in the middle of another
report, we know stacks are intermixed and the report is potentially
corrupted.

4 files changed, 662 insertions, 1 deletions

diff --git a/pkg/report/testdata/linux/report/115 b/pkg/report/testdata/linux/report/115
index 32110e1bd..8ebd9beda 100644
--- a/pkg/report/testdata/linux/report/115
+++ b/pkg/report/testdata/linux/report/115
@@ -1,4 +1,5 @@
-TITLE: BUG: bad unlock balance in ipmr_mfc_seq_stop
+TITLE: BUG: bad unlock balance detected! ]
+CORRUPTED: Y
 
 [   76.640408] binder: undelivered TRANSACTION_ERROR: 29189
 [   76.649866] [ BUG: bad unlock balance detected! ]
diff --git a/pkg/report/testdata/linux/report/206 b/pkg/report/testdata/linux/report/206
new file mode 100644
index 000000000..d969c4fc4
--- /dev/null
+++ b/pkg/report/testdata/linux/report/206
@@ -0,0 +1,322 @@
+TITLE: WARNING: suspicious RCU usage
+CORRUPTED: Y
+
+[  104.476079] =============================
+[  104.480269] WARNING: suspicious RCU usage
+[  104.484445] 4.15.0+ #222 Not tainted
+[  104.487764] syz-executor5: vmalloc: allocation failure: 17178296320 bytes, mode:0x14080c0(GFP_KERNEL|__GFP_ZERO), nodemask=(null)
+[  104.488198] -----------------------------
+[  104.500048] syz-executor5 cpuset=
+[  104.504201] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section!
+[  104.504384] /
+[  104.507648] 
+[  104.507648] other info that might help us debug this:
+[  104.507648] 
+[  104.516991]  mems_allowed=0
+[  104.518662] 
+[  104.518662] rcu_scheduler_active = 2, debug_locks = 1
+[  104.518672] 1 lock held by syz-executor4/5953:
+[  104.526809] CPU: 0 PID: 5955 Comm: syz-executor5 Not tainted 4.15.0+ #222
+[  104.529714]  #0: 
+[  104.536340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  104.536344] Call Trace:
+[  104.536358]  dump_stack+0x194/0x257
+[  104.536373]  ? arch_local_irq_restore+0x53/0x53
+[  104.540927]  (
+[  104.547817]  ? idr_get_free+0xfd0/0xfd0
+[  104.547846]  warn_alloc+0x19a/0x2b0
+[  104.549880] rcu_read_lock
+[  104.559209]  ? zone_watermark_ok_safe+0x400/0x400
+[  104.559237]  ? save_stack+0x43/0xd0
+[  104.561785] ){....}
+[  104.565373]  ? kasan_kmalloc+0xad/0xe0
+[  104.565381]  ? __kmalloc_node+0x47/0x70
+[  104.565391]  ? kvmalloc_node+0x64/0xd0
+[  104.570046] , at: [<0000000072a5383e>] __rds_conn_create+0xe46/0x1b50
+[  104.571808]  ? xt_alloc_table_info+0x63/0xe0
+[  104.571832]  __vmalloc_node_range+0x4f0/0x650
+[  104.575775] 
+[  104.575775] stack backtrace:
+[  104.579368]  ? lock_release+0xa40/0xa40
+[  104.579386]  ? xt_alloc_entry_offsets+0x21/0x30
+[  104.632860]  __vmalloc_node_flags_caller+0x50/0x60
+[  104.637777]  ? xt_alloc_entry_offsets+0x21/0x30
+[  104.642434]  kvmalloc_node+0x82/0xd0
+[  104.646136]  xt_alloc_entry_offsets+0x21/0x30
+[  104.650614]  translate_table+0x235/0x1690
+[  104.654750]  ? lock_release+0xa40/0xa40
+[  104.658708]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[  104.664604]  ? __check_object_size+0x8b/0x530
+[  104.669099]  ? __might_sleep+0x95/0x190
+[  104.673060]  ? alloc_counters.isra.10+0x7e0/0x7e0
+[  104.677889]  ? kasan_check_write+0x14/0x20
+[  104.682108]  ? _copy_from_user+0x99/0x110
+[  104.686242]  do_ip6t_set_ctl+0x370/0x5f0
+[  104.690289]  ? translate_compat_table+0x1c50/0x1c50
+[  104.695312]  ? mutex_unlock+0xd/0x10
+[  104.699008]  ? nf_sockopt_find.constprop.0+0x1a7/0x220
+[  104.704272]  nf_setsockopt+0x67/0xc0
+[  104.707972]  ipv6_setsockopt+0x10b/0x130
+[  104.712024]  tcp_setsockopt+0x82/0xd0
+[  104.715817]  sock_common_setsockopt+0x95/0xd0
+[  104.720300]  SyS_setsockopt+0x189/0x360
+[  104.724264]  ? SyS_recv+0x40/0x40
+[  104.727706]  ? move_addr_to_kernel+0x60/0x60
+[  104.732101]  ? do_syscall_64+0xb7/0x940
+[  104.736062]  ? SyS_recv+0x40/0x40
+[  104.739501]  do_syscall_64+0x282/0x940
+[  104.743369]  ? __do_page_fault+0xc90/0xc90
+[  104.747584]  ? finish_task_switch+0x1e2/0x890
+[  104.752060]  ? finish_task_switch+0x1b9/0x890
+[  104.756538]  ? syscall_return_slowpath+0x550/0x550
+[  104.761454]  ? syscall_return_slowpath+0x2ac/0x550
+[  104.766369]  ? prepare_exit_to_usermode+0x350/0x350
+[  104.771371]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
+[  104.776726]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[  104.781559]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
+[  104.786727] RIP: 0033:0x453a59
+[  104.789896] RSP: 002b:00007fd7139c7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
+[  104.797587] RAX: ffffffffffffffda RBX: 00007fd7139c86d4 RCX: 0000000000453a59
+[  104.804840] RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013
+[  104.812088] RBP: 000000000071bea0 R08: 0000000000000004 R09: 0000000000000000
+[  104.819341] R10: 0000000020001fde R11: 0000000000000246 R12: 00000000ffffffff
+[  104.826591] R13: 0000000000000508 R14: 00000000006f7960 R15: 0000000000000000
+[  104.833874] CPU: 1 PID: 5953 Comm: syz-executor4 Not tainted 4.15.0+ #222
+[  104.834422] Mem-Info:
+[  104.840788] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  104.840793] Call Trace:
+[  104.840807]  dump_stack+0x194/0x257
+[  104.840823]  ? arch_local_irq_restore+0x53/0x53
+[  104.843234] active_anon:59060 inactive_anon:63 isolated_anon:0
+[  104.843234]  active_file:3450 inactive_file:8420 isolated_file:0
+[  104.843234]  unevictable:0 dirty:6311 writeback:0 unstable:0
+[  104.843234]  slab_reclaimable:6999 slab_unreclaimable:92283
+[  104.843234]  mapped:24231 shmem:70 pagetables:731 bounce:0
+[  104.843234]  free:1433937 free_pcp:321 free_cma:0
+[  104.852560]  lockdep_rcu_suspicious+0x123/0x170
+[  104.855135] Node 0 active_anon:236240kB inactive_anon:252kB active_file:13800kB inactive_file:33680kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:96924kB dirty:25244kB writeback:0kB shmem:280kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 110592kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
+[  104.858724]  ___might_sleep+0x385/0x470
+[  104.858737]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[  104.863389] Node 0 
+[  104.896666]  ? __debug_object_init+0x235/0x1040
+[  104.896680]  ? debug_mutex_init+0x1c/0x60
+[  104.896697]  __might_sleep+0x95/0x190
+[  104.901355] DMA free:15908kB min:164kB low:204kB high:244kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15908kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
+[  104.929504]  kmem_cache_alloc_trace+0x299/0x740
+[  104.929517]  ? lock_acquire+0x1d5/0x580
+[  104.933470] lowmem_reserve[]:
+[  104.939316]  ? lock_acquire+0x1d5/0x580
+[  104.939327]  ? __rds_conn_create+0xe46/0x1b50
+[  104.939344]  rds_loop_conn_alloc+0xc8/0x380
+[  104.941554]  0
+[  104.946188]  ? rds_loop_conn_free+0x290/0x290
+[  104.946200]  ? __init_waitqueue_head+0x97/0x140
+[  104.946217]  ? rcutorture_record_progress+0x10/0x10
+[  104.950337]  2868
+[  104.954103]  ? __lockdep_init_map+0xe4/0x650
+[  104.954122]  __rds_conn_create+0x112f/0x1b50
+[  104.979601]  6378
+[  104.984272]  ? rds_conn_drop+0xb0/0xb0
+[  104.988212]  6378
+[  104.991280]  ? __kmalloc+0x4f1/0x760
+[  104.991291]  ? lock_downgrade+0x980/0x980
+[  104.991307]  ? lock_release+0xa40/0xa40
+[  104.999710]  ? __raw_spin_lock_init+0x1c/0x100
+[  104.999724]  ? trace_hardirqs_on_caller+0x421/0x5c0
+[  104.999744]  ? __lockdep_init_map+0xe4/0x650
+[  105.004037] Node 0 
+[  105.005807]  ? lockdep_init_map+0x9/0x10
+[  105.005815]  ? __init_waitqueue_head+0x97/0x140
+[  105.005827]  ? init_wait_entry+0x1b0/0x1b0
+[  105.010318] DMA32 free:2939236kB min:30316kB low:37892kB high:45468kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129292kB managed:2939944kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:708kB local_pcp:708kB free_cma:0kB
+[  105.014942]  ? lockdep_init_map+0x9/0x10
+[  105.014958]  ? rds_message_alloc+0x28c/0x330
+[  105.019953] lowmem_reserve[]:
+[  105.021980]  ? rds_message_next_extension+0x210/0x210
+[  105.021988]  ? trace_hardirqs_on+0xd/0x10
+[  105.022005]  ? _raw_spin_unlock_bh+0x30/0x40
+[  105.026391]  0
+[  105.030769]  ? __release_sock+0x360/0x360
+[  105.030776]  ? lock_sock_nested+0x91/0x110
+[  105.030793]  rds_conn_create_outgoing+0x3f/0x50
+[  105.032832]  0
+[  105.036689]  rds_sendmsg+0xda3/0x2390
+[  105.036698]  ? avc_has_perm+0x43e/0x680
+[  105.036733]  ? rds_send_drop_to+0x19d0/0x19d0
+[  105.038755]  3510
+[  105.042429]  ? iterate_fd+0x3f0/0x3f0
+[  105.042441]  ? trace_hardirqs_on_caller+0x421/0x5c0
+[  105.042458]  ? find_held_lock+0x35/0x1d0
+[  105.046579]  3510
+[  105.050535]  ? sock_has_perm+0x2a4/0x420
+[  105.060077]  ? selinux_secmark_relabel_packet+0xc0/0xc0
+[  105.060085]  ? lock_release+0xa02/0xa40
+[  105.060095]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[  105.064484] Node 0 
+[  105.066683]  ? __check_object_size+0x8b/0x530
+[  105.066706]  ? __might_sleep+0x95/0x190
+[  105.070761] Normal free:2780604kB min:37100kB low:46372kB high:55644kB active_anon:236240kB inactive_anon:252kB active_file:13800kB inactive_file:33680kB unevictable:0kB writepending:25244kB present:4718592kB managed:3594328kB mlocked:0kB kernel_stack:4384kB pagetables:2924kB bounce:0kB free_pcp:576kB local_pcp:340kB free_cma:0kB
+[  105.075384]  ? selinux_socket_sendmsg+0x36/0x40
+[  105.075396]  ? security_socket_sendmsg+0x89/0xb0
+[  105.079610] lowmem_reserve[]:
+[  105.106636]  ? rds_send_drop_to+0x19d0/0x19d0
+[  105.106650]  sock_sendmsg+0xca/0x110
+[  105.106665]  SYSC_sendto+0x361/0x5c0
+[  105.110704]  0
+[  105.115080]  ? SYSC_connect+0x4a0/0x4a0
+[  105.115114]  ? schedule+0xf5/0x430
+[  105.118266]  0
+[  105.123418]  ? SYSC_bind+0x290/0x410
+[  105.123460]  ? SyS_futex+0x269/0x390
+[  105.127570]  0
+[  105.131948]  ? do_futex+0x22a0/0x22a0
+[  105.131960]  ? exit_to_usermode_loop+0x198/0x2f0
+[  105.133743]  0
+[  105.137859]  ? trace_event_raw_event_sys_exit+0x260/0x260
+[  105.137877]  SyS_sendto+0x40/0x50
+[  105.146719]  ? SyS_getpeername+0x30/0x30
+[  105.146732]  do_syscall_64+0x282/0x940
+[  105.146742]  ? __do_page_fault+0xc90/0xc90
+[  105.148530] Node 0 
+[  105.152291]  ? finish_task_switch+0x1e2/0x890
+[  105.152299]  ? finish_task_switch+0x1b9/0x890
+[  105.152311]  ? syscall_return_slowpath+0x550/0x550
+[  105.156263] DMA: 
+[  105.160722]  ? syscall_return_slowpath+0x2ac/0x550
+[  105.160734]  ? prepare_exit_to_usermode+0x350/0x350
+[  105.160747]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
+[  105.162794] 1*4kB 
+[  105.166561]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[  105.166583]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
+[  105.171571] (U) 
+[  105.175588] RIP: 0033:0x453a59
+[  105.175593] RSP: 002b:00007f8067f6ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
+[  105.175602] RAX: ffffffffffffffda RBX: 00007f8067f6f6d4 RCX: 0000000000453a59
+[  105.175609] RDX: 0000000000000000 RSI: 0000000020ea8000 RDI: 0000000000000013
+[  105.177658] 0*8kB 
+[  105.181673] RBP: 000000000071bea0 R08: 0000000020dfcff0 R09: 0000000000000010
+[  105.181678] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
+[  105.181684] R13: 00000000000004b9 R14: 00000000006f71f8 R15: 0000000000000000
+[  105.182788] BUG: sleeping function called from invalid context at mm/slab.h:420
+[  105.187052] 0*16kB 
+[  105.191026] in_atomic(): 1, irqs_disabled(): 0, pid: 5953, name: syz-executor4
+[  105.191033] 1 lock held by syz-executor4/5953:
+[  105.196904] 1*32kB 
+[  105.199123]  #0:  (
+[  105.203610] (U) 
+[  105.207569] rcu_read_lock){....}
+[  105.236969] 2*64kB (U) 1*128kB (U) 1*256kB (U) 
+[  105.241653] , at: [<0000000072a5383e>] __rds_conn_create+0xe46/0x1b50
+[  105.241662] CPU: 1 PID: 5953 Comm: syz-executor4 Not tainted 4.15.0+ #222
+[  105.246399] 0*512kB 
+[  105.249463] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  105.249467] Call Trace:
+[  105.249481]  dump_stack+0x194/0x257
+[  105.249496]  ? arch_local_irq_restore+0x53/0x53
+[  105.253967] 1*1024kB 
+[  105.257643]  ? print_lock+0x9f/0xa2
+[  105.257653]  ? lockdep_print_held_locks+0xc4/0x130
+[  105.257674]  ___might_sleep+0x2b2/0x470
+[  105.261357] (U) 
+[  105.263123]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[  105.263132]  ? __debug_object_init+0x235/0x1040
+[  105.263145]  ? debug_mutex_init+0x1c/0x60
+[  105.267098] 1*2048kB 
+[  105.270609]  __might_sleep+0x95/0x190
+[  105.270628]  kmem_cache_alloc_trace+0x299/0x740
+[  105.272404] (M) 
+[  105.276089]  ? lock_acquire+0x1d5/0x580
+[  105.276096]  ? lock_acquire+0x1d5/0x580
+[  105.276109]  ? __rds_conn_create+0xe46/0x1b50
+[  105.279802] 3*4096kB 
+[  105.281575]  rds_loop_conn_alloc+0xc8/0x380
+[  105.281588]  ? rds_loop_conn_free+0x290/0x290
+[  105.285368] (M) 
+[  105.290086]  ? __init_waitqueue_head+0x97/0x140
+[  105.290102]  ? rcutorture_record_progress+0x10/0x10
+[  105.291886] = 15908kB
+[  105.297385]  ? __lockdep_init_map+0xe4/0x650
+[  105.297404]  __rds_conn_create+0x112f/0x1b50
+[  105.300839] Node 0 
+[  105.304895]  ? rds_conn_drop+0xb0/0xb0
+[  105.308761] DMA32: 
+[  105.312955]  ? __kmalloc+0x4f1/0x760
+[  105.312967]  ? lock_downgrade+0x980/0x980
+[  105.312983]  ? lock_release+0xa40/0xa40
+[  105.315200] 5*4kB 
+[  105.319652]  ? __raw_spin_lock_init+0x1c/0x100
+[  105.319666]  ? trace_hardirqs_on_caller+0x421/0x5c0
+[  105.319685]  ? __lockdep_init_map+0xe4/0x650
+[  105.324153] (M) 
+[  105.329053]  ? lockdep_init_map+0x9/0x10
+[  105.329061]  ? __init_waitqueue_head+0x97/0x140
+[  105.329073]  ? init_wait_entry+0x1b0/0x1b0
+[  105.331119] 4*8kB 
+[  105.336019]  ? lockdep_init_map+0x9/0x10
+[  105.336036]  ? rds_message_alloc+0x28c/0x330
+[  105.341029] (M) 
+[  105.346357]  ? rds_message_next_extension+0x210/0x210
+[  105.346365]  ? trace_hardirqs_on+0xd/0x10
+[  105.346382]  ? _raw_spin_unlock_bh+0x30/0x40
+[  105.348513] 3*16kB 
+[  105.353327]  ? __release_sock+0x360/0x360
+[  105.353336]  ? lock_sock_nested+0x91/0x110
+[  105.358507] (M) 
+[  105.360453]  rds_conn_create_outgoing+0x3f/0x50
+[  105.360470]  rds_sendmsg+0xda3/0x2390
+[  105.363640] 4*32kB 
+[  105.371309]  ? avc_has_perm+0x43e/0x680
+[  105.371345]  ? rds_send_drop_to+0x19d0/0x19d0
+[  105.378607] (M) 
+[  105.385824]  ? iterate_fd+0x3f0/0x3f0
+[  105.385837]  ? trace_hardirqs_on_caller+0x421/0x5c0
+[  105.385854]  ? find_held_lock+0x35/0x1d0
+[  105.387984] 2*64kB 
+[  105.395233]  ? sock_has_perm+0x2a4/0x420
+[  105.395248]  ? selinux_secmark_relabel_packet+0xc0/0xc0
+[  105.402496] (M) 
+[  105.409730]  ? lock_release+0xa02/0xa40
+[  105.409741]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[  105.409752]  ? __check_object_size+0x8b/0x530
+[  105.409773]  ? __might_sleep+0x95/0x190
+[  105.417193] 2*128kB 
+[  105.419400]  ? selinux_socket_sendmsg+0x36/0x40
+[  105.419412]  ? security_socket_sendmsg+0x89/0xb0
+[  105.426754] (M) 
+[  105.431298]  ? rds_send_drop_to+0x19d0/0x19d0
+[  105.431311]  sock_sendmsg+0xca/0x110
+[  105.431326]  SYSC_sendto+0x361/0x5c0
+[  105.433540] 1*256kB 
+[  105.435750]  ? SYSC_connect+0x4a0/0x4a0
+[  105.435782]  ? schedule+0xf5/0x430
+[  105.437723] (M) 
+[  105.441049]  ? SYSC_bind+0x290/0x410
+[  105.441092]  ? SyS_futex+0x269/0x390
+[  105.445728] 3*512kB 
+[  105.452275]  ? do_futex+0x22a0/0x22a0
+[  105.452287]  ? exit_to_usermode_loop+0x198/0x2f0
+[  105.459193] (M) 
+[  105.461487]  ? trace_event_raw_event_sys_exit+0x260/0x260
+[  105.461505]  SyS_sendto+0x40/0x50
+[  105.470841] 2*1024kB 
+[  105.473387]  ? SyS_getpeername+0x30/0x30
+[  105.473399]  do_syscall_64+0x282/0x940
+[  105.473411]  ? __do_page_fault+0xc90/0xc90
+[  105.477028] (M) 
+[  105.481647]  ? finish_task_switch+0x1e2/0x890
+[  105.481655]  ? finish_task_switch+0x1b9/0x890
+[  105.481667]  ? syscall_return_slowpath+0x550/0x550
+[  105.484061] 1*2048kB 
+2018/02/12 06:12:01 executing program 3:
+mmap(&(0x7f0000000000/0xfff000)=nil, 0xfff000, 0x3, 0x32, 0xffffffffffffffff, 0x0)
+r0 = socket$nfc_llcp(0x27, 0x3, 0x1)
+[  105.487650]  ? syscall_return_slowpath+0x2ac/0x550
+[  105.487661]  ? prepare_exit_to_usermode+0x350/0x350
+[  105.487674]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
+[  105.493069] (M) 
+[  105.497004]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[  105.497028]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
+[  105.498983] 716*4096kB 
+[  105.504827] RIP: 0033:0x453a59
+[  105.504833] RSP: 002b:00007f8067f6ec68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
+[  105.504842] RAX: ffffffffffffffda RBX: 00007f8067f6f6d4 RCX: 0000000000453a59
diff --git a/pkg/report/testdata/linux/report/207 b/pkg/report/testdata/linux/report/207
new file mode 100644
index 000000000..055c28d04
--- /dev/null
+++ b/pkg/report/testdata/linux/report/207
@@ -0,0 +1,43 @@
+TITLE: INFO: rcu detected stall in free_percpu
+
+isob2 login: [  709.689951] INFO: rcu_sched detected stalls on CPUs/tasks:
+[  709.695737] 	(detected by 0, t=125002 jiffies, g=6134, c=6133, q=11)
+[  709.702334] All QSes seen, last rcu_sched kthread activity 124990 (4295372585-4295247595), jiffies_till_next_fqs=3, root ->qsmask 0x0
+[  709.714440] kworker/0:0     R running task on cpu   0     0     4      2 0x00000008 584683503973
+[  709.723606] Workqueue: events bpf_map_free_deferred
+[  709.728724]  0000000000000000 ffff8801daa07c80 ffffffff813a0886 ffffffff813a0691
+[  709.736752]  000000000001e83e 0000000100062f29 00000001000446eb ffff8801daa20540
+[  709.744756]  ffffffff839bef80 0000000100062f29 ffff8801daa07c90 ffffffff813becd0
+[  709.752766] Call Trace:
+[  709.755323]  <IRQ>  [<ffffffff813a0886>] _sched_show_task+0x2a6/0x4f0
+[  709.762012]  [<ffffffff813a0691>] ? _sched_show_task+0xb1/0x4f0
+[  709.768049]  [<ffffffff813becd0>] sched_show_task+0x10/0x20
+[  709.773742]  [<ffffffff8148081c>] rcu_check_callbacks+0x1b7c/0x1da0
+[  709.780127]  [<ffffffff81494c5f>] update_process_times+0x3f/0x70
+[  709.786251]  [<ffffffff814bd59a>] tick_sched_handle.isra.17+0x5a/0x100
+[  709.792896]  [<ffffffff814bee0a>] tick_sched_timer+0x7a/0x130
+[  709.798758]  [<ffffffff81497169>] __hrtimer_run_queues+0x369/0xc10
+[  709.805052]  [<ffffffff814bed90>] ? tick_sched_do_timer+0xa0/0xa0
+[  709.811259]  [<ffffffff81496e00>] ? retrigger_next_event+0x170/0x170
+[  709.817730]  [<ffffffff81498f0c>] ? hrtimer_interrupt+0x10c/0x410
+[  709.823940]  [<ffffffff81498f84>] hrtimer_interrupt+0x184/0x410
+[  709.829975]  [<ffffffff812852b0>] local_apic_timer_interrupt+0x70/0xb0
+[  709.836617]  [<ffffffff81012895>] smp_apic_timer_interrupt+0xc5/0x100
+[  709.843176]  [<ffffffff81011752>] smp_apic_timer_interrupt_entry_after_kaiser_bti+0x20/0x2e
+[  709.851638]  <EOI>  [<ffffffff81010d64>] ? _raw_spin_unlock_irqrestore+0x64/0x80
+[  709.859295]  [<ffffffff81718c49>] free_percpu+0x1c9/0x360
+[  709.864815]  [<ffffffff81718a80>] ? pcpu_free_area+0x610/0x610
+[  709.870770]  [<ffffffff8163038a>] array_map_free+0xca/0x130
+[  709.876463]  [<ffffffff81332f3b>] ? free_uid+0xcb/0x290
+[  709.881810]  [<ffffffff8160eed1>] bpf_map_free_deferred+0xb1/0xe0
+executing program
+[  709.888018]  [<ffffffff81363350>] process_one_work+0x8c0/0x15a0
+[  709.894051]  [<ffffffff81363286>] ? process_one_work+0x7f6/0x15a0
+[  709.900265]  [<ffffffff81362a90>] ? pwq_dec_nr_in_flight+0x280/0x280
+[  709.906732]  [<ffffffff81364111>] worker_thread+0xe1/0xf70
+[  709.912338]  [<ffffffff81379281>] kthread+0x231/0x2c0
+[  709.917503]  [<ffffffff81364030>] ? process_one_work+0x15a0/0x15a0
+[  709.923801]  [<ffffffff81379050>] ? kthread_create_on_node+0x460/0x460
+[  709.930449]  [<ffffffff81379050>] ? kthread_create_on_node+0x460/0x460
+[  709.937100]  [<ffffffff82e25bac>] ret_from_fork+0x5c/0x90
+[  709.942620]  [<ffffffff81379050>] ? kthread_create_on_node+0x460/0x460
diff --git a/pkg/report/testdata/linux/report/208 b/pkg/report/testdata/linux/report/208
new file mode 100644
index 000000000..14071497f
--- /dev/null
+++ b/pkg/report/testdata/linux/report/208
@@ -0,0 +1,295 @@
+TITLE: WARNING: suspicious RCU usage
+CORRUPTED: Y
+
+[   63.724722] =============================
+[   63.728898] WARNING: suspicious RCU usage
+[   63.733060] 4.15.0+ #222 Not tainted
+[   63.733438] FAULT_INJECTION: forcing a failure.
+[   63.733438] name failslab, interval 1, probability 0, space 0, times 0
+[   63.736798] -----------------------------
+[   63.736809] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section!
+[   63.736812] 
+[   63.736812] other info that might help us debug this:
+[   63.736812] 
+[   63.736818] 
+[   63.736818] rcu_scheduler_active = 2, debug_locks = 1
+[   63.736824] 1 lock held by syz-executor7/10704:
+[   63.736829]  #0:  (rcu_read_lock){....}, at: [<00000000db78fcdc>] __rds_conn_create+0xe46/0x1b50
+[   63.736861] 
+[   63.736861] stack backtrace:
+[   63.748075] CPU: 1 PID: 10708 Comm: syz-executor2 Not tainted 4.15.0+ #222
+[   63.801181] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   63.810519] Call Trace:
+[   63.813099]  dump_stack+0x194/0x257
+[   63.816714]  ? arch_local_irq_restore+0x53/0x53
+[   63.821368]  ? __is_insn_slot_addr+0x1fc/0x330
+[   63.825946]  should_fail+0x8c0/0xa40
+[   63.829642]  ? check_noncircular+0x20/0x20
+[   63.833865]  ? fault_create_debugfs_attr+0x1f0/0x1f0
+[   63.838979]  ? find_held_lock+0x35/0x1d0
+[   63.843033]  ? __lock_is_held+0xb6/0x140
+[   63.847099]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   63.852966]  ? crypto_mod_get+0x4e/0x70
+[   63.856926]  ? rcu_note_context_switch+0x710/0x710
+[   63.861851]  should_failslab+0xec/0x120
+[   63.865814]  __kmalloc+0x63/0x760
+[   63.869254]  ? crypto_larval_alloc+0x1d0/0x1d0
+[   63.873824]  ? save_stack+0x43/0xd0
+[   63.877431]  ? kasan_kmalloc+0xad/0xe0
+[   63.881299]  ? __kmalloc+0x162/0x760
+[   63.884992]  ? crypto_create_tfm+0x82/0x2e0
+[   63.889310]  crypto_create_tfm+0x82/0x2e0
+[   63.893445]  crypto_alloc_tfm+0x114/0x2b0
+[   63.897578]  ? crypto_larval_alloc+0x1d0/0x1d0
+[   63.902147]  crypto_alloc_skcipher+0x2c/0x40
+[   63.906541]  cryptd_alloc_skcipher+0x124/0x250
+[   63.911108]  ? cryptd_hash_exit_tfm+0x40/0x40
+[   63.915602]  ? __lock_is_held+0xb6/0x140
+[   63.919663]  ? rcu_read_lock_sched_held+0x108/0x120
+[   63.924671]  simd_skcipher_init+0x66/0x150
+[   63.928886]  ? simd_skcipher_exit+0x40/0x40
+[   63.933190]  crypto_skcipher_init_tfm+0x29a/0x8c0
+[   63.938024]  crypto_create_tfm+0xdf/0x2e0
+[   63.942160]  crypto_alloc_tfm+0x114/0x2b0
+[   63.946293]  ? crypto_larval_alloc+0x1d0/0x1d0
+[   63.950864]  crypto_alloc_skcipher+0x2c/0x40
+[   63.955264]  drbg_init_sym_kernel+0x225/0x777
+[   63.959744]  ? drbg_init_hash_kernel+0x330/0x330
+[   63.964485]  ? find_held_lock+0x35/0x1d0
+[   63.968533]  ? check_noncircular+0x20/0x20
+[   63.972754]  ? check_noncircular+0x20/0x20
+[   63.976972]  ? check_noncircular+0x20/0x20
+[   63.981200]  ? drbg_init_hash_kernel+0x330/0x330
+[   63.985940]  drbg_kcapi_seed+0x4ea/0x1270
+[   63.990069]  ? find_held_lock+0x35/0x1d0
+[   63.994118]  ? drbg_kcapi_random+0x850/0x850
+[   63.998510]  ? __might_fault+0x110/0x1d0
+[   64.002554]  ? lock_downgrade+0x980/0x980
+[   64.006690]  ? lock_release+0xa40/0xa40
+[   64.010645]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   64.016511]  ? __check_object_size+0x8b/0x530
+[   64.021002]  ? __might_sleep+0x95/0x190
+[   64.024971]  crypto_rng_reset+0x7c/0x110
+[   64.029025]  rng_setkey+0x25/0x30
+[   64.032460]  ? rng_sock_destruct+0x90/0x90
+[   64.036676]  alg_setsockopt+0x2a1/0x350
+[   64.040641]  SyS_setsockopt+0x189/0x360
+[   64.044606]  ? SyS_recv+0x40/0x40
+[   64.048042]  ? SyS_write+0x184/0x220
+[   64.051743]  ? SyS_read+0x220/0x220
+[   64.055357]  ? do_syscall_64+0xb7/0x940
+[   64.059321]  ? SyS_recv+0x40/0x40
+[   64.062759]  do_syscall_64+0x282/0x940
+[   64.066630]  ? __do_page_fault+0xc90/0xc90
+[   64.070847]  ? finish_task_switch+0x1e2/0x890
+[   64.075322]  ? finish_task_switch+0x1b9/0x890
+[   64.079803]  ? syscall_return_slowpath+0x550/0x550
+[   64.084716]  ? syscall_return_slowpath+0x2ac/0x550
+[   64.089630]  ? prepare_exit_to_usermode+0x350/0x350
+[   64.094633]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
+[   64.099989]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[   64.104825]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
+[   64.109998] RIP: 0033:0x453a59
+[   64.113172] RSP: 002b:00007ff3775c5c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
+[   64.120864] RAX: ffffffffffffffda RBX: 00007ff3775c66d4 RCX: 0000000000453a59
+[   64.128115] RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000013
+[   64.135364] RBP: 000000000071bea0 R08: 0000000000000017 R09: 0000000000000000
+[   64.142614] R10: 0000000020e03000 R11: 0000000000000246 R12: 0000000000000014
+[   64.149868] R13: 00000000000004d2 R14: 00000000006f7450 R15: 0000000000000003
+[   64.157152] CPU: 0 PID: 10704 Comm: syz-executor7 Not tainted 4.15.0+ #222
+[   64.157778] DRBG: could not allocate CTR cipher TFM handle: ctr(aes)
+[   64.164151] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   64.164154] Call Trace:
+[   64.164168]  dump_stack+0x194/0x257
+[   64.164183]  ? arch_local_irq_restore+0x53/0x53
+[   64.164213]  lockdep_rcu_suspicious+0x123/0x170
+[   64.192382] ipt_CLUSTERIP: Please specify destination IP
+[   64.195494]  ___might_sleep+0x385/0x470
+[   64.195508]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   64.195516]  ? __debug_object_init+0x235/0x1040
+[   64.195526]  ? lock_acquire+0x1d5/0x580
+[   64.195538]  ? debug_mutex_init+0x1c/0x60
+[   64.195556]  __might_sleep+0x95/0x190
+[   64.195575]  kmem_cache_alloc_trace+0x299/0x740
+[   64.195588]  ? lock_acquire+0x1d5/0x580
+[   64.236054]  ? lock_acquire+0x1d5/0x580
+[   64.240035]  ? __rds_conn_create+0xe46/0x1b50
+[   64.244539]  rds_loop_conn_alloc+0xc8/0x380
+[   64.248863]  ? rds_loop_conn_free+0x290/0x290
+[   64.253357]  ? __init_waitqueue_head+0x97/0x140
+[   64.258032]  ? rcutorture_record_progress+0x10/0x10
+[   64.260721] FAULT_INJECTION: forcing a failure.
+[   64.260721] name failslab, interval 1, probability 0, space 0, times 0
+[   64.263053]  ? __lockdep_init_map+0xe4/0x650
+[   64.263075]  __rds_conn_create+0x112f/0x1b50
+[   64.263121]  ? rds_conn_drop+0xb0/0xb0
+[   64.263150]  ? __raw_spin_lock_init+0x1c/0x100
+[   64.263168]  ? trace_hardirqs_on_caller+0x421/0x5c0
+[   64.296521]  ? __lockdep_init_map+0xe4/0x650
+[   64.300921]  ? lockdep_init_map+0x9/0x10
+[   64.304965]  ? __init_waitqueue_head+0x97/0x140
+[   64.309622]  ? init_wait_entry+0x1b0/0x1b0
+[   64.313850]  ? lockdep_init_map+0x9/0x10
+[   64.317903]  ? rds_message_alloc+0x28c/0x330
+[   64.322300]  ? rds_message_next_extension+0x210/0x210
+[   64.327471]  ? trace_hardirqs_on+0xd/0x10
+[   64.331612]  ? _raw_spin_unlock_bh+0x30/0x40
+[   64.336016]  ? __release_sock+0x360/0x360
+[   64.340149]  ? lock_sock_nested+0x91/0x110
+[   64.344376]  rds_conn_create_outgoing+0x3f/0x50
+[   64.349036]  rds_sendmsg+0xda3/0x2390
+[   64.352849]  ? rds_send_drop_to+0x19d0/0x19d0
+[   64.357328]  ? __might_fault+0x110/0x1d0
+[   64.361386]  ? lock_release+0xa40/0xa40
+[   64.365344]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   64.371219]  ? find_held_lock+0x35/0x1d0
+[   64.375274]  ? sock_has_perm+0x2a4/0x420
+[   64.379323]  ? selinux_secmark_relabel_packet+0xc0/0xc0
+[   64.384674]  ? lock_downgrade+0x980/0x980
+[   64.388810]  ? dup_iter+0x1a2/0x260
+[   64.392425]  ? lock_release+0xa40/0xa40
+[   64.396406]  ? selinux_socket_sendmsg+0x36/0x40
+[   64.401060]  ? security_socket_sendmsg+0x89/0xb0
+[   64.405802]  ? rds_send_drop_to+0x19d0/0x19d0
+[   64.410285]  sock_sendmsg+0xca/0x110
+[   64.413991]  ___sys_sendmsg+0x320/0x8b0
+[   64.417961]  ? copy_msghdr_from_user+0x590/0x590
+[   64.422718]  ? exit_robust_list+0x240/0x240
+[   64.427029]  ? release_sock+0x1d4/0x2a0
+[   64.430985]  ? trace_hardirqs_on+0xd/0x10
+[   64.435119]  ? __local_bh_enable_ip+0x121/0x230
+[   64.439782]  ? __fget_light+0x2b2/0x3c0
+[   64.443742]  ? fget_raw+0x20/0x20
+[   64.447186]  ? rds_trans_get_preferred+0xfb/0x130
+[   64.452022]  ? rds_bind+0x3bd/0xc00
+[   64.455651]  ? __fdget+0x18/0x20
+[   64.459010]  __sys_sendmmsg+0x1ee/0x620
+[   64.462969]  ? __sys_sendmmsg+0x1ee/0x620
+[   64.467116]  ? SyS_sendmsg+0x50/0x50
+[   64.470816]  ? security_socket_bind+0x89/0xb0
+[   64.475301]  ? fput+0xd2/0x140
+[   64.478478]  ? SYSC_bind+0x290/0x410
+[   64.482182]  ? move_addr_to_kernel.part.18+0x100/0x100
+[   64.487467]  ? SyS_futex+0x269/0x390
+[   64.491165]  ? fd_install+0x4d/0x60
+[   64.494783]  ? do_futex+0x22a0/0x22a0
+[   64.498566]  ? SyS_socket+0x12d/0x1d0
+[   64.502357]  ? move_addr_to_kernel+0x60/0x60
+[   64.506758]  SyS_sendmmsg+0x35/0x60
+[   64.510371]  ? __sys_sendmmsg+0x620/0x620
+[   64.514505]  do_syscall_64+0x282/0x940
+[   64.518380]  ? __do_page_fault+0xc90/0xc90
+[   64.522601]  ? finish_task_switch+0x1e2/0x890
+[   64.527078]  ? finish_task_switch+0x1b9/0x890
+[   64.531558]  ? syscall_return_slowpath+0x550/0x550
+[   64.536471]  ? syscall_return_slowpath+0x2ac/0x550
+[   64.541386]  ? prepare_exit_to_usermode+0x350/0x350
+[   64.546388]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
+[   64.551746]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[   64.556582]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
+[   64.561753] RIP: 0033:0x453a59
+[   64.564926] RSP: 002b:00007f820036ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
+[   64.572618] RAX: ffffffffffffffda RBX: 00007f820036b6d4 RCX: 0000000000453a59
+[   64.579870] RDX: 0000000000000001 RSI: 0000000020573000 RDI: 0000000000000014
+[   64.587119] RBP: 000000000071bea0 R08: 0000000000000000 R09: 0000000000000000
+[   64.594370] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
+[   64.601619] R13: 00000000000004a1 R14: 00000000006f6fb8 R15: 0000000000000000
+[   64.608902] CPU: 1 PID: 10720 Comm: syz-executor2 Not tainted 4.15.0+ #222
+[   64.609526] BUG: sleeping function called from invalid context at mm/slab.h:420
+[   64.615901] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   64.615905] Call Trace:
+[   64.615918]  dump_stack+0x194/0x257
+[   64.615933]  ? arch_local_irq_restore+0x53/0x53
+[   64.623359] in_atomic(): 1, irqs_disabled(): 0, pid: 10704, name: syz-executor7
+[   64.632701]  should_fail+0x8c0/0xa40
+[   64.635267] 1 lock held by syz-executor7/10704:
+[   64.639378]  ? fault_create_debugfs_attr+0x1f0/0x1f0
+[   64.639405]  ? check_noncircular+0x20/0x20
+[   64.644046]  #0: 
+[   64.651470]  ? find_held_lock+0x35/0x1d0
+[   64.651490]  ? __lock_is_held+0xb6/0x140
+[   64.655175]  (
+[   64.659834]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   64.664907] rcu_read_lock
+[   64.669114]  ? rcu_note_context_switch+0x710/0x710
+[   64.669138]  should_failslab+0xec/0x120
+[   64.671171] ){....}
+[   64.675202]  __kmalloc+0x63/0x760
+[   64.675217]  ? crypto_spawn_alg.isra.15+0x1b/0xc0
+[   64.679259] , at: [<00000000db78fcdc>] __rds_conn_create+0xe46/0x1b50
+[   64.681023]  ? __down_interruptible+0x6b0/0x6b0
+[   64.681033]  ? crypto_create_tfm+0x82/0x2e0
+[   64.681052]  crypto_create_tfm+0x82/0x2e0
+[   64.728519]  ? up_read+0x1a/0x40
+[   64.731877]  crypto_spawn_tfm2+0x4f/0x90
+[   64.735923]  cryptd_skcipher_init_tfm+0x3e/0xe0
+[   64.740573]  ? cryptd_skcipher_encrypt+0x680/0x680
+[   64.745484]  crypto_skcipher_init_tfm+0x29a/0x8c0
+[   64.750313]  crypto_create_tfm+0xdf/0x2e0
+[   64.754452]  crypto_alloc_tfm+0x114/0x2b0
+[   64.758585]  ? crypto_larval_alloc+0x1d0/0x1d0
+[   64.763157]  crypto_alloc_skcipher+0x2c/0x40
+[   64.767551]  cryptd_alloc_skcipher+0x124/0x250
+[   64.772119]  ? cryptd_hash_exit_tfm+0x40/0x40
+[   64.776611]  ? __lock_is_held+0xb6/0x140
+[   64.780671]  ? rcu_read_lock_sched_held+0x108/0x120
+[   64.785679]  simd_skcipher_init+0x66/0x150
+[   64.789896]  ? simd_skcipher_exit+0x40/0x40
+[   64.794201]  crypto_skcipher_init_tfm+0x29a/0x8c0
+[   64.799032]  crypto_create_tfm+0xdf/0x2e0
+[   64.803173]  crypto_alloc_tfm+0x114/0x2b0
+[   64.807308]  ? crypto_larval_alloc+0x1d0/0x1d0
+[   64.811877]  crypto_alloc_skcipher+0x2c/0x40
+[   64.816270]  drbg_init_sym_kernel+0x225/0x777
+[   64.820754]  ? drbg_init_hash_kernel+0x330/0x330
+[   64.825493]  ? find_held_lock+0x35/0x1d0
+[   64.829543]  ? check_noncircular+0x20/0x20
+[   64.833761]  ? check_noncircular+0x20/0x20
+[   64.837981]  ? check_noncircular+0x20/0x20
+[   64.842206]  ? drbg_init_hash_kernel+0x330/0x330
+[   64.846950]  drbg_kcapi_seed+0x4ea/0x1270
+[   64.851084]  ? find_held_lock+0x35/0x1d0
+[   64.855134]  ? drbg_kcapi_random+0x850/0x850
+[   64.859528]  ? __might_fault+0x110/0x1d0
+[   64.863574]  ? lock_downgrade+0x980/0x980
+[   64.867712]  ? lock_release+0xa40/0xa40
+[   64.871668]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   64.877534]  ? __check_object_size+0x8b/0x530
+[   64.882025]  ? __might_sleep+0x95/0x190
+[   64.885999]  crypto_rng_reset+0x7c/0x110
+[   64.890055]  rng_setkey+0x25/0x30
+[   64.893489]  ? rng_sock_destruct+0x90/0x90
+[   64.897709]  alg_setsockopt+0x2a1/0x350
+[   64.901678]  SyS_setsockopt+0x189/0x360
+[   64.905644]  ? SyS_recv+0x40/0x40
+[   64.909082]  ? SyS_write+0x184/0x220
+[   64.912782]  ? SyS_read+0x220/0x220
+[   64.916396]  ? do_syscall_64+0xb7/0x940
+[   64.920358]  ? SyS_recv+0x40/0x40
+[   64.923795]  do_syscall_64+0x282/0x940
+[   64.927669]  ? __do_page_fault+0xc90/0xc90
+[   64.931911]  ? finish_task_switch+0x5af/0x890
+[   64.936391]  ? syscall_return_slowpath+0x550/0x550
+[   64.941305]  ? syscall_return_slowpath+0x2ac/0x550
+[   64.946221]  ? prepare_exit_to_usermode+0x350/0x350
+[   64.951222]  ? entry_SYSCALL_64_after_hwframe+0x36/0x9b
+[   64.956573]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[   64.961407]  entry_SYSCALL_64_after_hwframe+0x26/0x9b
+[   64.966578] RIP: 0033:0x453a59
+[   64.969748] RSP: 002b:00007ff3775c5c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
+[   64.977438] RAX: ffffffffffffffda RBX: 00007ff3775c66d4 RCX: 0000000000453a59
+[   64.984688] RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000013
+[   64.991940] RBP: 000000000071bea0 R08: 0000000000000017 R09: 0000000000000000
+[   64.999192] R10: 0000000020e03000 R11: 0000000000000246 R12: 0000000000000014
+[   65.006443] R13: 00000000000004d2 R14: 00000000006f7450 R15: 0000000000000004
+[   65.013730] CPU: 0 PID: 10704 Comm: syz-executor7 Not tainted 4.15.0+ #222
+[   65.014255] DRBG: could not allocate CTR cipher TFM handle: ctr(aes)
+[   65.020726] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   65.020730] Call Trace:
+[   65.020743]  dump_stack+0x194/0x257
+[   65.020757]  ? arch_local_irq_restore+0x53/0x53
+[   65.047385]  ? print_lock+0x9f/0xa2
+[   65.051008]  ? lockdep_print_held_locks+0xc4/0x130
+[   65.055942]  ___might_sleep+0x2b2/0x470
+[   65.059917]  ? trace_event_raw_event_sched_switch+0x810/0x810
+[   65.065801]  ? __debug_object_init+0x235/0x1040