pkg/report: add more TODO cases

3 files changed, 376 insertions, 0 deletions

diff --git a/pkg/report/testdata/linux/report/157 b/pkg/report/testdata/linux/report/157
new file mode 100644
index 000000000..f725b6983
--- /dev/null
+++ b/pkg/report/testdata/linux/report/157
@@ -0,0 +1,172 @@
+# TODO: must be "WARNING in sctp_wfree", or "WARNING in refcount_sub_and_test in sctp_wfree",
+# or "WARNING: refcount bug in sctp_wfree".
+TITLE: WARNING in refcount_sub_and_test
+
+[   44.461565] refcount_t: underflow; use-after-free.
+[   44.466577] ------------[ cut here ]------------
+[   44.471332] WARNING: CPU: 1 PID: 2992 at lib/refcount.c:186 refcount_sub_and_test+0x167/0x1b0
+[   44.479978] Kernel panic - not syncing: panic_on_warn set ...
+[   44.479978] 
+[   44.487309] CPU: 1 PID: 2992 Comm: syzkaller263121 Not tainted 4.14.0-rc5+ #91
+[   44.494631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   44.503948] Call Trace:
+[   44.506504]  dump_stack+0x194/0x257
+[   44.510098]  ? arch_local_irq_restore+0x53/0x53
+[   44.514735]  panic+0x1e4/0x417
+[   44.517892]  ? __warn+0x1d9/0x1d9
+[   44.521307]  ? show_regs_print_info+0x65/0x65
+[   44.525774]  ? refcount_sub_and_test+0x167/0x1b0
+[   44.530498]  __warn+0x1c4/0x1d9
+[   44.533743]  ? refcount_sub_and_test+0x167/0x1b0
+[   44.538466]  report_bug+0x211/0x2d0
+[   44.542078]  fixup_bug+0x40/0x90
+[   44.545410]  do_trap+0x260/0x390
+[   44.548743]  do_error_trap+0x120/0x390
+[   44.552593]  ? vprintk_emit+0x49b/0x590
+[   44.556537]  ? do_trap+0x390/0x390
+[   44.560045]  ? refcount_sub_and_test+0x167/0x1b0
+[   44.564766]  ? vprintk_emit+0x3ea/0x590
+[   44.568710]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[   44.573519]  do_invalid_op+0x1b/0x20
+[   44.577201]  invalid_op+0x18/0x20
+[   44.580618] RIP: 0010:refcount_sub_and_test+0x167/0x1b0
+[   44.585944] RSP: 0018:ffff8801d1f4e9c8 EFLAGS: 00010282
+[   44.591271] RAX: 0000000000000026 RBX: 0000000000000001 RCX: 0000000000000000
+[   44.598504] RDX: 0000000000000026 RSI: 1ffff1003a3e9cf9 RDI: ffffed003a3e9d2d
+[   44.605737] RBP: ffff8801d1f4ea58 R08: 0000000000000000 R09: 1ffff1003a3e9ccb
+[   44.612969] R10: ffff8801d1f4e7f8 R11: ffffffff85b2cb78 R12: 1ffff1003a3e9d3a
+[   44.620203] R13: 00000000ffffff01 R14: 0000000000000100 R15: ffff8801d1d16a3c
+[   44.627449]  ? refcount_sub_and_test+0x167/0x1b0
+[   44.632170]  ? refcount_inc+0x50/0x50
+[   44.635936]  ? __sctp_outq_teardown+0xa5b/0x1230
+[   44.640656]  ? sctp_association_free+0x2d0/0x930
+[   44.645375]  ? sctp_do_sm+0x271b/0x6a30
+[   44.649313]  ? sctp_primitive_SHUTDOWN+0xa0/0xd0
+[   44.654031]  ? sctp_close+0x3c6/0x980
+[   44.657795]  ? inet_release+0xed/0x1c0
+[   44.661648]  ? sock_release+0x8d/0x1e0
+[   44.665498]  ? sock_close+0x16/0x20
+[   44.669090]  sctp_wfree+0x183/0x620
+[   44.672685]  ? entry_SYSCALL_64_fastpath+0xbc/0xbe
+[   44.677580]  ? __sctp_write_space+0x910/0x910
+[   44.682043]  skb_release_head_state+0x124/0x200
+[   44.686676]  skb_release_all+0x15/0x60
+[   44.690528]  consume_skb+0x153/0x490
+[   44.694202]  ? sctp_chunk_put+0x99/0x420
+[   44.698226]  ? alloc_skb_with_frags+0x750/0x750
+[   44.702858]  ? sctp_chunk_hold+0x20/0x20
+[   44.706884]  ? sctp_sched_dequeue_common+0x2aa/0x5d0
+[   44.711952]  ? refcount_sub_and_test+0x115/0x1b0
+[   44.716672]  ? refcount_inc+0x50/0x50
+[   44.720440]  ? trace_hardirqs_off+0xd/0x10
+[   44.724641]  ? quarantine_put+0xeb/0x190
+[   44.728672]  sctp_chunk_put+0x29c/0x420
+[   44.732615]  ? sctp_chunk_hold+0x20/0x20
+[   44.736643]  ? sctp_transport_dst_confirm+0x50/0x50
+[   44.741627]  ? sctp_sched_fcfs_dequeue+0x198/0x290
+[   44.746522]  ? sctp_sched_dequeue_common+0x5d0/0x5d0
+[   44.751594]  sctp_chunk_free+0x53/0x60
+[   44.755448]  __sctp_outq_teardown+0xa5b/0x1230
+[   44.759997]  ? sctp_inq_set_th_handler+0x1b0/0x1b0
+[   44.764894]  ? debug_check_no_locks_freed+0x3c0/0x3c0
+[   44.770054]  ? check_preempt_wakeup+0x1320/0x1320
+[   44.774873]  ? debug_check_no_locks_freed+0x3c0/0x3c0
+[   44.780030]  ? default_wake_function+0x30/0x50
+[   44.784576]  ? autoremove_wake_function+0x78/0x350
+[   44.789471]  ? finish_wait+0x490/0x490
+[   44.793325]  ? lock_acquire+0x1d5/0x580
+[   44.797266]  ? lock_acquire+0x1d5/0x580
+[   44.801206]  ? lock_acquire+0x1d5/0x580
+[   44.805147]  ? __wake_up_common_lock+0x1c2/0x310
+[   44.809879]  ? lock_acquire+0x1d5/0x580
+[   44.813821]  ? sock_def_wakeup+0x1f9/0x350
+[   44.818023]  ? lock_downgrade+0x990/0x990
+[   44.822138]  ? lock_release+0xa40/0xa40
+[   44.826078]  ? trace_raw_output_tick_stop+0x130/0x130
+[   44.831234]  sctp_outq_free+0x15/0x20
+[   44.834999]  sctp_association_free+0x2d0/0x930
+[   44.839548]  ? sctp_asconf_queue_teardown+0x700/0x700
+[   44.844704]  ? sock_def_wakeup+0x222/0x350
+[   44.848907]  ? sk_dst_check+0x560/0x560
+[   44.852852]  ? lock_release+0xa40/0xa40
+[   44.856794]  ? bpf_prog_kallsyms_find+0xbd/0x440
+[   44.861519]  sctp_do_sm+0x271b/0x6a30
+[   44.865286]  ? lock_acquire+0x1d5/0x580
+[   44.869227]  ? is_bpf_text_address+0x7b/0x120
+[   44.873691]  ? sctp_do_8_2_transport_strike.isra.16+0x8a0/0x8a0
+[   44.879718]  ? debug_check_no_locks_freed+0x3c0/0x3c0
+[   44.884875]  ? do_raw_spin_trylock+0x190/0x190
+[   44.889429]  ? debug_check_no_locks_freed+0x3c0/0x3c0
+[   44.894592]  ? lock_acquire+0x1d5/0x580
+[   44.898532]  ? lock_acquire+0x1d5/0x580
+[   44.902469]  ? skb_dequeue+0x12a/0x180
+[   44.906323]  ? lock_downgrade+0x990/0x990
+[   44.910438]  ? do_raw_spin_trylock+0x190/0x190
+[   44.914986]  ? lock_release+0xa40/0xa40
+[   44.918928]  ? trace_hardirqs_on+0xd/0x10
+[   44.923045]  sctp_primitive_SHUTDOWN+0xa0/0xd0
+[   44.927595]  sctp_close+0x3c6/0x980
+[   44.931192]  ? sctp_apply_peer_addr_params+0xf30/0xf30
+[   44.936438]  ? debug_check_no_locks_freed+0x3c0/0x3c0
+[   44.941593]  ? lock_downgrade+0x990/0x990
+[   44.945705]  ? lock_downgrade+0x990/0x990
+[   44.949821]  ? locks_remove_file+0x3fa/0x5a0
+[   44.954195]  ? fcntl_setlk+0x10c0/0x10c0
+[   44.958223]  ? bsearch+0x83/0xa0
+[   44.961555]  ? __fsnotify_parent+0xb4/0x3a0
+[   44.965841]  ? ip_mc_drop_socket+0x1ce/0x230
+[   44.970218]  inet_release+0xed/0x1c0
+[   44.973901]  sock_release+0x8d/0x1e0
+[   44.977581]  ? sock_release+0x1e0/0x1e0
+[   44.981521]  sock_close+0x16/0x20
+[   44.984942]  __fput+0x327/0x7e0
+[   44.988190]  ? fput+0x140/0x140
+[   44.991441]  ____fput+0x15/0x20
+[   44.994686]  task_work_run+0x199/0x270
+[   44.998539]  ? task_work_cancel+0x210/0x210
+[   45.002829]  ? __do_page_fault+0x3d6/0xd60
+[   45.007032]  get_signal+0x1343/0x16d0
+[   45.010798]  ? mm_fault_error+0x2c0/0x2c0
+[   45.014910]  ? ptrace_notify+0x130/0x130
+[   45.018935]  ? do_page_fault+0xee/0x720
+[   45.022874]  ? __do_page_fault+0xd60/0xd60
+[   45.027072]  ? do_page_fault+0xee/0x720
+[   45.031011]  ? __do_page_fault+0xd60/0xd60
+[   45.035210]  ? lock_acquire+0x1d5/0x580
+[   45.039147]  ? lock_acquire+0x1d5/0x580
+[   45.043093]  do_signal+0x94/0x1ee0
+[   45.046597]  ? lock_acquire+0x1d5/0x580
+[   45.050533]  ? lock_acquire+0x1d5/0x580
+[   45.054470]  ? put_unused_fd+0x62/0x70
+[   45.058322]  ? lock_downgrade+0x990/0x990
+[   45.062437]  ? setup_sigcontext+0x7d0/0x7d0
+[   45.066722]  ? do_raw_spin_trylock+0x190/0x190
+[   45.071271]  ? task_work_add+0x10e/0x1b0
+[   45.075296]  ? __put_unused_fd+0x183/0x250
+[   45.079498]  ? alloc_fdtable+0x280/0x280
+[   45.083524]  ? cpumask_weight.constprop.3+0x45/0x45
+[   45.088509]  ? _copy_to_user+0xa2/0xc0
+[   45.092398]  ? _raw_spin_unlock+0x22/0x30
+[   45.096511]  ? fput+0xd2/0x140
+[   45.099669]  ? SYSC_accept4+0x4ec/0x850
+[   45.103622]  ? kernel_accept+0x2f0/0x2f0
+[   45.107668]  exit_to_usermode_loop+0x214/0x310
+[   45.112219]  ? trace_event_raw_event_sys_exit+0x260/0x260
+[   45.117728]  syscall_return_slowpath+0x42f/0x510
+[   45.122448]  ? finish_task_switch+0x1aa/0x740
+[   45.126907]  ? prepare_exit_to_usermode+0x2d0/0x2d0
+[   45.131889]  ? prepare_exit_to_usermode+0x1a0/0x2d0
+[   45.136869]  ? perf_trace_sys_enter+0xc20/0xc20
+[   45.141502]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[   45.146226]  entry_SYSCALL_64_fastpath+0xbc/0xbe
+[   45.150944] RIP: 0033:0x446539
+[   45.154099] RSP: 002b:00007f402614bdc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000120
+[   45.161772] RAX: fffffffffffffff2 RBX: 0000000000000000 RCX: 0000000000446539
+[   45.169007] RDX: 0000000020137ffc RSI: 0000000020b53ff0 RDI: 0000000000000003
+[   45.176244] RBP: 0000000000000000 R08: 00007f402614c700 R09: 00007f402614c700
+[   45.183479] R10: 0000000000080000 R11: 0000000000000202 R12: 0000000000000000
+[   45.190717] R13: 00000000007efe7f R14: 00007f402614c9c0 R15: 0000000000000000
+[   45.198315] Dumping ftrace buffer:
+[   45.201822]    (ftrace buffer empty)
+[   45.205500] Kernel Offset: disabled
+[   45.209092] Rebooting in 86400 seconds..
diff --git a/pkg/report/testdata/linux/report/158 b/pkg/report/testdata/linux/report/158
new file mode 100644
index 000000000..afe9ccbec
--- /dev/null
+++ b/pkg/report/testdata/linux/report/158
@@ -0,0 +1,116 @@
+# TODO: must be "WARNING: refcount bug in dev_activate".
+TITLE: WARNING in refcount_inc
+
+[  359.890494] refcount_t: increment on 0; use-after-free.
+[  359.914113] ------------[ cut here ]------------
+[  359.919670] WARNING: CPU: 0 PID: 28200 at lib/refcount.c:152 refcount_inc+0x47/0x50
+2017/08/31 09:09:03 executing program 2:
+mmap(&(0x7f0000000000/0xfff000)=nil, 0xfff000, 0x3, 0x32, 0xffffffffffffffff, 0x0)
+r0 = perf_event_open(&(0x7f000001d000)={0x2, 0x78, 0xdf, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfe, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0x0)
+r1 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000007000-0xa)="2f6465762f70746d7800", 0x20003, 0x0)
+mmap(&(0x7f0000007000/0x1000)=nil, 0x1000, 0x3, 0x32, 0xffffffffffffffff, 0x0)
+r2 = dup(r1)
+ioctl$KVM_GET_REGS(r2, 0x8090ae81, &(0x7f00001bb000)={[0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0], 0x0, 0x0})
+ioctl$TIOCMGET(r0, 0x5415, &(0x7f0000e85000)=0x0)
+ioctl$TIOCSCTTY(r2, 0x540e, 0x800)
+r3 = socket$inet(0x2, 0x2, 0x0)
+getsockopt$sock_int(r2, 0x1, 0x200000000032, &(0x7f0000a1d000-0x4)=0x0, &(0x7f0000a8f000-0x4)=0x4)
+r4 = socket$kcm(0x29, 0x5, 0x0)
+writev(r4, &(0x7f0000e5b000)=[{&(0x7f0000c7c000)="4ab6b00b23359a6a25d060bfd09f633f4929df8bc1ea04c19cbf9ca9d96e33a184a46f0c6ebed565a793332077fe2005e180962553f6486616c22bc8254220dcf916a833f31ef38227acf2f47170ba7143635a1b91eb4504b1febc6a5789c926a809ad57545373ebcc5b1e9ccffbd8192fc721baa2107595f09b4124d7a14159d1ae2203ccd768e901cf3ac21e0d6a12da29ede746be4fce5a1911b2b8895096cac5186eadefe76d2077f44ff2feb7a5e448863220679bc1e8f58bec3b0a40f55371d1b2a7d542716928c6846de42bafc6cc093dcc4ac44d52618da3fd190dad7af93dd999a79b716597e6feda6369a5d53a12c332d1f1", 0xf7}, {&(0x7f0000ef7000)="8a7c9f32c556f72679a2062cb55358182e1dd7e13c49536e92899dea88490bae49c8cf792959d550c602fd9cce8ad6ac930a16b02d14b4555e4f5df016716514e7df686782df9af01e0b1735eef3e21e9f34419fba568230027d945d223ac5cadd9bdd1dd9b2c5bd826f452b67cb95550d3e5076cf9cef5857ba9923a369e319b7289ad5c216a3991abd01c9647f602e33a84b26e1e086da95299f7983604e39a5dc02a5b188f0a85a08dd290895e44c6d74f4be8613399baa5cf0bf731cda420f26b40d7324", 0xc6}, {&(0x7f0000d7b000-0xf7)="3a90cea993628e38282a20eaf9243cfb3498f39b3a64df551ab649ce086b8ee95f6fb3d0f9be8b8f648c78027908ca2d6c46a3ee8cf83d695c132f64ad4be84fcc93d47ea38de50d219e43e668a4574b5870b06f353e64334b2342b1cd97f9ed21e79ad77839270fcd95e37f97e97b42b0c365d82da33c2f98141c97449382ff2f06457e9b9f2299393ccccd8a6bd9a524aefb7b816e0e2b8b556b62a5669de8ba2d82fa956941da2647b83e86a78631e2ea04756ec340e0d51a3fa95e162c2040b7d6895b18d72e7c56593bf6906324188c904786705384443d89137af988acc6257654c0a95f4e45080ba481949f0d8e27c4ff3bd537", 0xf7}, {&(0x7f000023d000-0x8d)="ef1e47bc1b92b8aa3ee83fe3d494dfe12a2f72e8d6d2f28035a4e80ad64d24b7d18d26fc03d2b5ba48cff12f44a43114c6bb5d4478816589820e215929a5e7af69ef374de43bf3e18ab0e24ea599618415e6a937c11ec1b9aecdda619370f68e3de7c8b4803635dd196a14fa172c807d185b464083743dd59146d48ac7d3bc193f85eda847a963b3900de205d3", 0x8d}, {&(0x7f00005c3000-0x4d)="f198f10b08173e545f9033f2472d72055a780614aa9e45ef68d4a9d9f42e048770033930435e39bb04801d080488a522006dc1b10978daf10de9ce9408ad741c36b21dea713b803fb15bf04959", 0x4d}], 0x5)
+fsync(r3)
+mmap(&(0x7f0000000000/0xfff000)=nil, 0xfff000, 0x3, 0x32, 0xffffffffffffffff, 0x0)
+perf_event_open(&(0x7f00008a8000-0x78)={0x4000000002, 0x78, 0xdb, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfc, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80000000000000, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x0, 0x3, 0xffffffffffffffff, 0x0)
+r5 = syz_open_dev$sndtimer(&(0x7f0000000000)="2f6465762f736e642f74696d657200", 0x0, 0x0)
+getsockopt$inet_sctp_SCTP_ASSOCINFO(r2, 0x84, 0x1, &(0x7f0000bbf000)={<r6=>0x0, 0x20, 0x1000, 0x3, 0x7, 0x1800000000}, &(0x7f0000025000-0x4)=0x14)
+setsockopt$inet_sctp6_SCTP_ASSOCINFO(r2, 0x84, 0x1, &(0x7f000005d000-0x14)={r6, 0x1, 0xffffffff, 0xfffffffffffffffa, 0x80000, 0x3ff}, 0x14)
+ioctl$SNDRV_TIMER_IOCTL_GPARAMS(r5, 0x40485404, &(0x7f0000f88000-0x48)={{0x0, 0x0, 0x0, 0x0, 0x9}, 0x0, 0x0, [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0]})
+ioctl$SNDRV_TIMER_IOCTL_STATUS(r2, 0x80605414, &(0x7f00007a9000)="000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
+ioctl$sock_kcm_SIOCKCMUNATTACH(r2, 0x89e1, &(0x7f00006d2000-0x4)={r3})
+r7 = socket$netlink(0x10, 0x3, 0xb)
+mkdir(&(0x7f000028c000-0x8)="2e2f66696c653000", 0x82)
+writev(r7, &(0x7f00004a4000)=[{&(0x7f0000aea000-0x39)="390000001300194700bb61e1c305000040000200050000000000000080000900130001000000ff00280fe20000000000000000000000000ad670", 0x3a}], 0x1)
+sendto$llc(r2, &(0x7f0000cde000)="993812b205fe34116b1bbe2cafa830e4cb8d5daf991e3c42e1c54d368363207f5f7f6b99e8970d953bc11ddaa01362e3ad69fb5174f000f78bb5f001fd462e3c68438a5f01117ee10fc8975a828c91a5bcadce8f1b80090fcae973289c27c5cd0129475c6140133664df66e4b1e06d8313946dcba4664a5a259e34797e95b9", 0x7f, 0x20040841, &(0x7f000042f000-0x10)={0x1a, 0x17, 0xadef, 0x3, 0x7, 0x3f, @random="573a697a8ca5", [0x0, 0x0]}, 0x10)
+fstat(r0, &(0x7f00004fc000-0x44)={0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0})
+socketpair$ax25(0x3, 0x3, 0xc4, &(0x7f000095a000)={0xffffffffffffffff, 0xffffffffffffffff})
+r8 = signalfd4(0xffffffffffffffff, &(0x7f0000ce2000)={0x7fffffff}, 0x8, 0x0)
+read(r8, &(0x7f0000e78000-0x80)="0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", 0x80)
+inotify_init1(0x80804)
+setsockopt$inet_sctp6_SCTP_EVENTS(r2, 0x84, 0xb, &(0x7f00002f6000-0xb)={0x0, 0x100000001, 0x1, 0x9, 0x7, 0x0, 0x1, 0x8, 0x7, 0xcccc, 0x10000005}, 0xb)
+[  359.985135] Kernel panic - not syncing: panic_on_warn set ...
+[  359.985135] 
+[  359.992585] CPU: 0 PID: 28200 Comm: syz-executor7 Not tainted 4.13.0-rc7+ #60
+[  359.999847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[  360.009190] Call Trace:
+[  360.011774]  dump_stack+0x194/0x257
+[  360.015414]  ? arch_local_irq_restore+0x53/0x53
+[  360.020091]  panic+0x1e4/0x417
+[  360.023270]  ? __warn+0x1d9/0x1d9
+[  360.026706]  ? show_regs_print_info+0x65/0x65
+[  360.031193]  ? retint_kernel+0x10/0x10
+[  360.035065]  ? __warn+0x1a9/0x1d9
+[  360.038513]  ? refcount_inc+0x47/0x50
+[  360.042297]  __warn+0x1c4/0x1d9
+[  360.045578]  ? refcount_inc+0x47/0x50
+[  360.049371]  report_bug+0x211/0x2d0
+[  360.053032]  fixup_bug+0x40/0x90
+[  360.056390]  do_trap+0x260/0x390
+[  360.059766]  do_error_trap+0x120/0x390
+[  360.063653]  ? vprintk_emit+0x49b/0x590
+[  360.067619]  ? do_trap+0x390/0x390
+[  360.071177]  ? refcount_inc+0x47/0x50
+[  360.074961]  ? vprintk_emit+0x3ea/0x590
+[  360.078936]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[  360.083775]  do_invalid_op+0x1b/0x20
+[  360.087475]  invalid_op+0x1e/0x30
+[  360.090909] RIP: 0010:refcount_inc+0x47/0x50
+[  360.095323] RSP: 0018:ffff8801cb557928 EFLAGS: 00010282
+[  360.100669] RAX: 000000000000002b RBX: ffffffff8608f514 RCX: 0000000000000000
+[  360.107934] RDX: 000000000000002b RSI: ffffffff8159319e RDI: ffffed00396aaf19
+[  360.115187] RBP: ffff8801cb557930 R08: 0000000000000001 R09: 0000000000000000
+[  360.122452] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8608f3c0
+[  360.129703] R13: 0000000000000001 R14: ffff8801c27e3580 R15: dffffc0000000000
+[  360.136985]  ? vprintk_func+0x5e/0xc0
+[  360.140775]  ? refcount_inc+0x47/0x50
+[  360.144568]  dev_activate+0x7d3/0xaa0
+[  360.148368]  ? qdisc_create_dflt+0x160/0x160
+[  360.152765]  ? __local_bh_enable_ip+0x9d/0x160
+[  360.157340]  ? trace_hardirqs_on_caller+0x421/0x5c0
+[  360.162343]  ? dev_set_rx_mode+0x2f/0x40
+[  360.166389]  ? trace_hardirqs_on+0xd/0x10
+[  360.170526]  ? __local_bh_enable_ip+0x9d/0x160
+[  360.175096]  ? _raw_spin_unlock_bh+0x30/0x40
+[  360.179499]  __dev_open+0x227/0x330
+[  360.183113]  ? dev_set_rx_mode+0x40/0x40
+[  360.187159]  ? dev_set_rx_mode+0x2f/0x40
+[  360.191219]  ? trace_hardirqs_on+0xd/0x10
+[  360.195351]  ? __local_bh_enable_ip+0x9d/0x160
+[  360.199920]  ? _raw_spin_unlock_bh+0x30/0x40
+[  360.204325]  ? dev_set_rx_mode+0x40/0x40
+[  360.208373]  __dev_change_flags+0x159/0x3d0
+[  360.212687]  dev_change_flags+0x88/0x140
+[  360.216747]  devinet_ioctl+0x123d/0x19a0
+[  360.220809]  ? inet_ifa_byprefix+0x1e0/0x1e0
+[  360.225275]  inet_ioctl+0x117/0x1c0
+[  360.228885]  ? inet_ioctl+0x117/0x1c0
+[  360.232675]  sock_do_ioctl+0x65/0xb0
+[  360.236381]  sock_ioctl+0x2c2/0x440
+[  360.240000]  ? dlci_ioctl_set+0x40/0x40
+[  360.243959]  do_vfs_ioctl+0x1b1/0x1520
+[  360.247840]  ? ioctl_preallocate+0x2b0/0x2b0
+[  360.252241]  ? selinux_capable+0x40/0x40
+[  360.256295]  ? __sb_end_write+0xa0/0xd0
+[  360.260263]  ? fput+0xd2/0x140
+[  360.263459]  ? security_file_ioctl+0x89/0xb0
+[  360.267876]  SyS_ioctl+0x8f/0xc0
+[  360.271253]  entry_SYSCALL_64_fastpath+0x1f/0xbe
+[  360.275990] RIP: 0033:0x451e59
+[  360.279173] RSP: 002b:00007f7999f6ac08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
+[  360.286864] RAX: ffffffffffffffda RBX: 00000000007180b0 RCX: 0000000000451e59
+[  360.294114] RDX: 000000002044ffe0 RSI: 0000000000008914 RDI: 0000000000000006
+[  360.301364] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
+[  360.308614] R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b69f7
+[  360.315866] R13: 00007f7999f6ab48 R14: 00000000004b6a07 R15: 0000000000000000
+[  360.323787] Dumping ftrace buffer:
+[  360.327372]    (ftrace buffer empty)
+[  360.331051] Kernel Offset: disabled
+[  360.334650] Rebooting in 86400 seconds..
diff --git a/pkg/report/testdata/linux/report/159 b/pkg/report/testdata/linux/report/159
new file mode 100644
index 000000000..beef78dd8
--- /dev/null
+++ b/pkg/report/testdata/linux/report/159
@@ -0,0 +1,88 @@
+# TODO: must be "WARNING: refcount bug in l2tp_session_register".
+TITLE: WARNING in refcount_inc
+
+[   40.530345] ------------[ cut here ]------------
+[   40.535205] refcount_t: increment on 0; use-after-free.
+[   40.540824] WARNING: CPU: 1 PID: 3697 at lib/refcount.c:153 refcount_inc+0x47/0x50
+[   40.548509] Kernel panic - not syncing: panic_on_warn set ...
+[   40.548509] 
+[   40.555846] CPU: 1 PID: 3697 Comm: syzkaller479670 Not tainted 4.15.0-rc8+ #174
+[   40.563263] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
+[   40.572588] Call Trace:
+[   40.575151]  dump_stack+0x194/0x257
+[   40.578756]  ? arch_local_irq_restore+0x53/0x53
+[   40.583400]  ? vsnprintf+0x1ed/0x1900
+[   40.587179]  panic+0x1e4/0x41c
+[   40.590345]  ? refcount_error_report+0x214/0x214
+[   40.595074]  ? show_regs_print_info+0x18/0x18
+[   40.599549]  ? __warn+0x1c1/0x200
+[   40.602978]  ? refcount_inc+0x47/0x50
+[   40.606749]  __warn+0x1dc/0x200
+[   40.610000]  ? console_unlock+0x983/0xd80
+[   40.614122]  ? refcount_inc+0x47/0x50
+[   40.617897]  report_bug+0x211/0x2d0
+[   40.621502]  fixup_bug.part.11+0x37/0x80
+[   40.625537]  do_error_trap+0x2d7/0x3e0
+[   40.629398]  ? __down_trylock_console_sem+0x10d/0x1e0
+[   40.634563]  ? math_error+0x400/0x400
+[   40.638337]  ? vprintk_emit+0x3ea/0x590
+[   40.642295]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[   40.647113]  do_invalid_op+0x1b/0x20
+[   40.650800]  invalid_op+0x22/0x40
+[   40.654227] RIP: 0010:refcount_inc+0x47/0x50
+[   40.658604] RSP: 0018:ffff8801d9077788 EFLAGS: 00010286
+[   40.663948] RAX: dffffc0000000008 RBX: ffff8801d94f48c0 RCX: ffffffff8159dade
+[   40.671190] RDX: 0000000000000000 RSI: 1ffff1003b20eeac RDI: ffff8801d9077490
+[   40.678432] RBP: ffff8801d9077790 R08: 1ffff1003b20ee6e R09: 0000000000000000
+[   40.685674] R10: ffff8801d9077658 R11: 0000000000000000 R12: 0000000000000000
+[   40.692915] R13: 0000000000000000 R14: ffff8801bc2540c0 R15: ffff8801d2cb6800
+[   40.700169]  ? vprintk_func+0x5e/0xc0
+[   40.703949]  ? refcount_inc+0x47/0x50
+[   40.707727]  l2tp_session_register+0x9cb/0xe20
+[   40.712291]  ? l2tp_tunnel_get+0x690/0x690
+[   40.716497]  ? pppol2tp_connect+0x11ee/0x1dd0
+[   40.720966]  ? lock_downgrade+0x980/0x980
+[   40.725087]  ? ipv4_mtu+0x34d/0x4c0
+[   40.728688]  ? rt_cpu_seq_show+0x2c0/0x2c0
+[   40.732896]  ? refcount_add+0x60/0x60
+[   40.736670]  ? __lock_is_held+0xb6/0x140
+[   40.740717]  pppol2tp_connect+0x134b/0x1dd0
+[   40.745023]  ? pppol2tp_recv_payload_hook+0x1b0/0x1b0
+[   40.750194]  ? selinux_netlbl_socket_connect+0x76/0x1b0
+[   40.755535]  ? selinux_socket_connect+0x311/0x730
+[   40.760349]  ? lock_downgrade+0x980/0x980
+[   40.764484]  ? selinux_socket_setsockopt+0x80/0x80
+[   40.769383]  ? lock_release+0xa40/0xa40
+[   40.773331]  ? trace_event_raw_event_sched_switch+0x800/0x800
+[   40.779188]  ? __check_object_size+0x25d/0x4f0
+[   40.783749]  ? __might_sleep+0x95/0x190
+[   40.787707]  ? security_socket_connect+0x89/0xb0
+[   40.792442]  SYSC_connect+0x213/0x4a0
+[   40.796217]  ? SYSC_bind+0x410/0x410
+[   40.799906]  ? handle_mm_fault+0x410/0x8d0
+[   40.804113]  ? __do_page_fault+0x32d/0xc90
+[   40.808320]  ? __handle_mm_fault+0x3ce0/0x3ce0
+[   40.812871]  ? vmacache_find+0x5f/0x280
+[   40.816821]  ? up_read+0x1a/0x40
+[   40.820162]  ? __do_page_fault+0x3d6/0xc90
+[   40.824381]  SyS_connect+0x24/0x30
+[   40.827892]  ? SyS_accept+0x30/0x30
+[   40.831491]  do_fast_syscall_32+0x3ee/0xf9d
+[   40.835790]  ? do_int80_syscall_32+0x9d0/0x9d0
+[   40.840343]  ? trace_hardirqs_on_thunk+0x1a/0x1c
+[   40.845090]  ? syscall_return_slowpath+0x2ad/0x550
+[   40.849991]  ? prepare_exit_to_usermode+0x340/0x340
+[   40.854985]  ? retint_user+0x18/0x18
+[   40.858679]  ? trace_hardirqs_off_thunk+0x1a/0x1c
+[   40.863502]  entry_SYSENTER_compat+0x54/0x63
+[   40.867881] RIP: 0023:0xf7fbac79
+[   40.871216] RSP: 002b:00000000ff9c653c EFLAGS: 00000207 ORIG_RAX: 000000000000016a
+[   40.878896] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000205fafd2
+[   40.886137] RDX: 000000000000002e RSI: 0000000000000167 RDI: 0000000000000018
+[   40.893381] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
+[   40.900622] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
+[   40.907863] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
+[   40.915598] Dumping ftrace buffer:
+[   40.919171]    (ftrace buffer empty)
+[   40.922857] Kernel Offset: disabled
+[   40.926459] Rebooting in 86400 seconds..