https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3701/shard-hsw4/igt@gem_exec_suspend@basic-s4-devices.html

<3>[  431.276629] INFO: task dmesg:1072 blocked for more than 60 seconds.
<3>[  431.276701]       Tainted: G     U  W        4.15.0-CI-CI_DRM_3701+ #1
<3>[  431.276753] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6>[  431.276814] dmesg           D    0  1072    995 0x00000000
<4>[  431.276828] Call Trace:
<4>[  431.276853]  ? __schedule+0x3c3/0xaf0
<4>[  431.276871]  ? bit_wait+0x50/0x50
<4>[  431.276884]  schedule+0x37/0x90
<4>[  431.276896]  io_schedule+0xd/0x30
<4>[  431.276906]  bit_wait_io+0x8/0x50
<4>[  431.276916]  __wait_on_bit+0x4e/0x80
<4>[  431.276931]  out_of_line_wait_on_bit+0x78/0x80
<4>[  431.276943]  ? bit_waitqueue+0x30/0x30
<4>[  431.276956]  do_get_write_access+0x1f4/0x660
<4>[  431.276975]  ? ext4_dirty_inode+0x3e/0x60
<4>[  431.276984]  jbd2_journal_get_write_access+0x27/0x50
<4>[  431.276996]  __ext4_journal_get_write_access+0x5e/0xb0
<4>[  431.277009]  ext4_reserve_inode_write+0x88/0xb0
<4>[  431.277021]  ext4_mark_inode_dirty+0x63/0x270
<4>[  431.277031]  ? rcu_read_lock_sched_held+0x6f/0x80
<4>[  431.277047]  ext4_dirty_inode+0x3e/0x60
<4>[  431.277058]  __mark_inode_dirty+0x67/0x690
<4>[  431.277073]  generic_update_time+0x73/0xc0
<4>[  431.277082]  ? current_time+0x2d/0x60
<4>[  431.277094]  file_update_time+0x90/0xe0
<4>[  431.277111]  __generic_file_write_iter+0x94/0x1b0
<4>[  431.277129]  ext4_file_write_iter+0x10f/0x3a0
<4>[  431.277144]  ? lock_acquire+0xaf/0x200
<4>[  431.277160]  __vfs_write+0xc5/0x130
<4>[  431.277180]  vfs_write+0xbd/0x1b0
<4>[  431.277192]  SyS_write+0x40/0xa0
<4>[  431.277207]  entry_SYSCALL_64_fastpath+0x22/0x8f
<4>[  431.277215] RIP: 0033:0x7f1ea54f88f0
<4>[  431.277221] RSP: 002b:00007ffe26a7fc78 EFLAGS: 00000246
<4>[  431.277247] 
<4>[  431.277247] Showing all locks held in the system:
<4>[  431.277269] 2 locks held by khungtaskd/67:
<4>[  431.277280]  #0:  (rcu_read_lock){....}, at: [<00000000319d6f30>] watchdog+0x9b/0x5e0
<4>[  431.277312]  #1:  (tasklist_lock){.+.+}, at: [<0000000007d1d642>] debug_show_all_locks+0x37/0x1a0
<4>[  431.277353] 1 lock held by systemd-udevd/250:
<4>[  431.277357]  #0:  (&type->i_mutex_dir_key){++++}, at: [<0000000077ad1826>] lookup_slow+0xaf/0x1b0
<4>[  431.277393] 1 lock held by in:imklog/575:
<4>[  431.277398]  #0:  (&f->f_pos_lock){+.+.}, at: [<00000000b20b5414>] __fdget_pos+0x3a/0x50
<4>[  431.277431] 2 locks held by NetworkManager/665:
<4>[  431.277436]  #0:  (sb_writers#3){.+.+}, at: [<00000000a50e88f8>] mnt_want_write+0x1b/0x50
<4>[  431.277466]  #1:  (&type->i_mutex_dir_key/1){+.+.}, at: [<00000000e3fb6276>] do_unlinkat+0x107/0x2d0
<4>[  431.277575] 3 locks held by dmesg/1072:
<4>[  431.277580]  #0:  (sb_writers#3){.+.+}, at: [<000000004d6f3c87>] vfs_write+0x158/0x1b0
<4>[  431.277619]  #1:  (&sb->s_type->i_mutex_key#14){+.+.}, at: [<00000000d9faa4ef>] ext4_file_write_iter+0x64/0x3a0
<4>[  431.277668]  #2:  (jbd2_handle){++++}, at: [<000000003cfde8e9>] start_this_handle+0xff/0x440
<4>[  431.277709] 3 locks held by python3/1301:
<4>[  431.277715]  #0:  (sb_writers#3){.+.+}, at: [<00000000a50e88f8>] mnt_want_write+0x1b/0x50
<4>[  431.277758]  #1:  (&type->i_mutex_dir_key){++++}, at: [<000000002af914c9>] path_openat+0x440/0x9d0
<4>[  431.277794]  #2:  (jbd2_handle){++++}, at: [<000000003cfde8e9>] start_this_handle+0xff/0x440
<4>[  431.277847] 4 locks held by kworker/u16:60/3002:
<4>[  431.277852]  #0:  ((wq_completion)"writeback"){+.+.}, at: [<00000000d741bf6b>] process_one_work+0x191/0x640
<4>[  431.277882]  #1:  ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: [<00000000d741bf6b>] process_one_work+0x191/0x640
<4>[  431.277909]  #2:  (&type->s_umount_key#33){++++}, at: [<000000000bde5a54>] trylock_super+0x11/0x50
<4>[  431.277941]  #3:  (&sbi->s_journal_flag_rwsem){.+.+}, at: [<000000007cf99b19>] do_writepages+0x1b/0x70
<4>[  431.277973] 2 locks held by cron/3012:
<4>[  431.277978]  #0:  (sb_writers#3){.+.+}, at: [<00000000a50e88f8>] mnt_want_write+0x1b/0x50
<4>[  431.278007]  #1:  (&type->i_mutex_dir_key){++++}, at: [<000000002af914c9>] path_openat+0x440/0x9d0
<4>[  431.278034] 
<4>[  431.278040] =============================================
<4>[  431.278040] 
<4>[  431.278047] NMI backtrace for cpu 5
<4>[  431.278058] CPU: 5 PID: 67 Comm: khungtaskd Tainted: G     U  W        4.15.0-CI-CI_DRM_3701+ #1
<4>[  431.278067] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  431.278074] Call Trace:
<4>[  431.278089]  dump_stack+0x5f/0x86
<4>[  431.278104]  nmi_cpu_backtrace+0xb4/0xc0
<4>[  431.278121]  ? lapic_can_unplug_cpu+0x90/0x90
<4>[  431.278134]  nmi_trigger_cpumask_backtrace+0xb8/0xf0
<4>[  431.278148]  watchdog+0x43e/0x5e0
<4>[  431.278165]  kthread+0xfb/0x130
<4>[  431.278173]  ? reset_hung_task_detector+0x10/0x10
<4>[  431.278180]  ? _kthread_create_on_node+0x30/0x30
<4>[  431.278193]  ret_from_fork+0x3a/0x50
<6>[  431.278223] Sending NMI from CPU 5 to CPUs 0-4,6-7:
<4>[  431.278240] NMI backtrace for cpu 2
<4>[  431.278247] CPU: 2 PID: 228 Comm: systemd-journal Tainted: G     U  W        4.15.0-CI-CI_DRM_3701+ #1
<4>[  431.278250] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  431.278262] RIP: 0010:debug_check_no_locks_freed+0xa9/0x140
<4>[  431.278265] RSP: 0018:ffffc900003bfe88 EFLAGS: 00000002
<4>[  431.278270] RAX: 0000000000000000 RBX: ffff8804057a9200 RCX: 0000000000d20c83
<4>[  431.278272] RDX: 0000000000000000 RSI: ffffffff821087b1 RDI: ffffffff811deecb
<4>[  431.278275] RBP: ffff8804057a9200 R08: 0000000000000000 R09: 0000000000000001
<4>[  431.278277] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000001000
<4>[  431.278280] R13: 0000000000000002 R14: ffff88040c9c27c0 R15: 0000559475442bf0
<4>[  431.278284] FS:  00007fc2694428c0(0000) GS:ffff88041fa80000(0000) knlGS:0000000000000000
<4>[  431.278286] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  431.278289] CR2: 00007fc2640fa008 CR3: 00000004099c8005 CR4: 00000000001606e0
<4>[  431.278291] Call Trace:
<4>[  431.278303]  ? do_sys_open+0x197/0x1f0
<4>[  431.278309]  kmem_cache_free+0x8b/0x320
<4>[  431.278317]  do_sys_open+0x197/0x1f0
<4>[  431.278326]  do_syscall_64+0x59/0x1a0
<4>[  431.278333]  entry_SYSCALL64_slow_path+0x25/0x25
<4>[  431.278337] RIP: 0033:0x7fc2689f7d70
<4>[  431.278339] RSP: 002b:00007fff979ff788 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
<4>[  431.278344] RAX: ffffffffffffffda RBX: 00007fff979ffa90 RCX: 00007fc2689f7d70
<4>[  431.278346] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000559475442dd0
<4>[  431.278349] RBP: 000000000000000d R08: 00000000000001c0 R09: 00000000ffffffff
<4>[  431.278351] R10: 00007fc2689e1b58 R11: 0000000000000246 R12: 00000000ffffffff
<4>[  431.278354] R13: 000055947542c040 R14: 00007fff979ffa50 R15: 0000559475442bf0
<4>[  431.278361] Code: 85 c0 74 34 41 f7 c5 00 02 00 00 74 16 48 8b 7c 24 28 e8 1b fc ff ff 41 55 9d 5b 5d 41 5c 41 5d 41 5e c3 41 55 9d 48 8b 7c 24 28 <5b> 5d 41 5c 41 5d 41 5e e9 0a cc ff ff 48 c7 c7 44 6e 07 82 e8 
<4>[  431.278445] NMI backtrace for cpu 6 skipped: idling at intel_idle+0x6f/0x120
<4>[  431.278451] NMI backtrace for cpu 3
<4>[  431.278459] CPU: 3 PID: 576 Comm: rs:main Q:Reg Tainted: G     U  W        4.15.0-CI-CI_DRM_3701+ #1
<4>[  431.278461] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  431.278471] RIP: 0010:lock_release+0x134/0x300
<4>[  431.278474] RSP: 0018:ffffc900004df9c0 EFLAGS: 00000046
<4>[  431.278479] RAX: ffff880406f0cf40 RBX: ffff880406f0cf40 RCX: 1028129d00000000
<4>[  431.278481] RDX: 0000000000000003 RSI: 000000004e9f6afb RDI: 0000000000000000
<4>[  431.278484] RBP: ffffffff822464a0 R08: ffff880406f0d840 R09: 000000004fa73c86
<4>[  431.278487] R10: 0000000000000000 R11: ffffffff81138170 R12: ffffffff811381fd
<4>[  431.278489] R13: 0000000000000082 R14: 0000000000000003 R15: ffff88040ae420c0
<4>[  431.278495] FS:  00007f359b41e700(0000) GS:ffff88041fac0000(0000) knlGS:0000000000000000
<4>[  431.278499] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  431.278503] CR2: 00007fc3d5ad8ed8 CR3: 0000000409a5c001 CR4: 00000000001606e0
<4>[  431.278505] Call Trace:
<4>[  431.278517]  __is_insn_slot_addr+0xaa/0x120
<4>[  431.278524]  kernel_text_address+0xab/0xd0
<4>[  431.278534]  ? unwind_next_frame+0x42f/0x6b0
<4>[  431.278539]  __kernel_text_address+0x9/0x30
<4>[  431.278546]  unwind_get_return_address+0x16/0x30
<4>[  431.278552]  __save_stack_trace+0x7e/0xd0
<4>[  431.278563]  ? jbd2__journal_start+0x69/0x2b0
<4>[  431.278569]  ? jbd2__journal_start+0x69/0x2b0
<4>[  431.278574]  set_track+0x5c/0x120
<4>[  431.278581]  alloc_debug_processing+0x156/0x1a0
<4>[  431.278588]  ___slab_alloc.constprop.30+0x3a8/0x3d0
<4>[  431.278594]  ? jbd2__journal_start+0x69/0x2b0
<4>[  431.278602]  ? lock_acquire+0xaf/0x200
<4>[  431.278610]  ? __lock_acquire+0x4ab/0x1b60
<4>[  431.278617]  ? jbd2__journal_start+0x69/0x2b0
<4>[  431.278623]  ? __slab_alloc.isra.24.constprop.29+0x3d/0x70
<4>[  431.278627]  __slab_alloc.isra.24.constprop.29+0x3d/0x70
<4>[  431.278633]  ? jbd2__journal_start+0x69/0x2b0
<4>[  431.278638]  kmem_cache_alloc+0x21a/0x2b0
<4>[  431.278645]  jbd2__journal_start+0x69/0x2b0
<4>[  431.278653]  ext4_dirty_inode+0x28/0x60
<4>[  431.278659]  __mark_inode_dirty+0x67/0x690
<4>[  431.278667]  generic_update_time+0x73/0xc0
<4>[  431.278672]  ? current_time+0x2d/0x60
<4>[  431.278678]  file_update_time+0x90/0xe0
<4>[  431.278687]  __generic_file_write_iter+0x94/0x1b0
<4>[  431.278696]  ext4_file_write_iter+0x10f/0x3a0
<4>[  431.278703]  ? lock_acquire+0xaf/0x200
<4>[  431.278709]  __vfs_write+0xc5/0x130
<4>[  431.278717]  vfs_write+0xbd/0x1b0
<4>[  431.278722]  SyS_write+0x40/0xa0
<4>[  431.278730]  entry_SYSCALL_64_fastpath+0x22/0x8f
<4>[  431.278737] RIP: 0033:0x7f359e06b68d
<4>[  431.278740] RSP: 002b:00007f359b41d5c0 EFLAGS: 00000293
<4>[  431.278747] Code: 85 d2 0f 84 f4 00 00 00 65 48 8b 3c 25 80 4e 01 00 e8 a1 a4 ff ff 65 48 8b 04 25 80 4e 01 00 c7 80 ac 08 00 00 00 00 00 00 41 55 <9d> 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e f3 c3 65 8b 05 16 5b f3 
<4>[  431.278826] NMI backtrace for cpu 4
<4>[  431.278832] CPU: 4 PID: 575 Comm: in:imklog Tainted: G     U  W        4.15.0-CI-CI_DRM_3701+ #1
<4>[  431.278834] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  431.278843] RIP: 0010:preempt_count_sub+0x0/0x90
<4>[  431.278846] RSP: 0018:ffffc900005cfd30 EFLAGS: 00000246
<4>[  431.278851] RAX: ffff880406f08040 RBX: 0000000000000246 RCX: 0000000000000006
<4>[  431.278853] RDX: 0000000000000ec4 RSI: ffffffff821087b1 RDI: 0000000000000001
<4>[  431.278856] RBP: ffffffff8379cd88 R08: ffff880406f088f0 R09: 000000003638e619
<4>[  431.278859] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8803f85a13f8
<4>[  431.278864] R13: ffffffff8379cd80 R14: 0000000000000001 R15: ffffffff8379cd88
<4>[  431.278868] FS:  00007f359bc1f700(0000) GS:ffff88041fb00000(0000) knlGS:0000000000000000
<4>[  431.278872] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  431.278876] CR2: 00007fc3d5ade080 CR3: 0000000409a5c001 CR4: 00000000001606e0
<4>[  431.278879] Call Trace:
<4>[  431.278887]  _raw_spin_unlock_irqrestore+0x39/0x60
<4>[  431.278896]  debug_check_no_obj_freed+0x11f/0x230
<4>[  431.278905]  ? mark_held_locks+0x64/0x90
<4>[  431.278911]  ? do_syslog+0x450/0x4f0
<4>[  431.278917]  kfree+0x1bd/0x2d0
<4>[  431.278923]  do_syslog+0x450/0x4f0
<4>[  431.278933]  kmsg_read+0x39/0x50
<4>[  431.278941]  proc_reg_read+0x38/0x60
<4>[  431.278946]  __vfs_read+0x1e/0x120
<4>[  431.278954]  vfs_read+0x9e/0x150
<4>[  431.278960]  SyS_read+0x40/0xa0
<4>[  431.278968]  entry_SYSCALL_64_fastpath+0x22/0x8f
<4>[  431.278972] RIP: 0033:0x7f359e06b6ed
<4>[  431.278975] RSP: 002b:00007f359bbfe580 EFLAGS: 00000293
<4>[  431.278983] Code: 80 02 00 00 48 89 83 88 02 00 00 8b 05 9e b2 19 01 89 83 a0 02 00 00 31 c0 66 89 83 a4 02 00 00 5b 5d c3 0f 1f 84 00 00 00 00 00 <8b> 0d 72 56 5c 02 85 c9 75 1b 65 8b 15 7f d5 f6 7e 89 d1 81 e1 
<4>[  431.279071] NMI backtrace for cpu 7 skipped: idling at intel_idle+0x6f/0x120
<4>[  431.279082] NMI backtrace for cpu 0 skipped: idling at intel_idle+0x6f/0x120
<4>[  431.279092] NMI backtrace for cpu 1 skipped: idling at intel_idle+0x6f/0x120
<0>[  431.279248] Kernel panic - not syncing: hung_task: blocked tasks
<4>[  431.279304] CPU: 5 PID: 67 Comm: khungtaskd Tainted: G     U  W        4.15.0-CI-CI_DRM_3701+ #1
<4>[  431.279373] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  431.279433] Call Trace:
<4>[  431.279466]  dump_stack+0x5f/0x86
<4>[  431.279503]  panic+0xcf/0x20d
<4>[  431.279549]  watchdog+0x44a/0x5e0
<4>[  431.279594]  kthread+0xfb/0x130
<4>[  431.279629]  ? reset_hung_task_detector+0x10/0x10
<4>[  431.279671]  ? _kthread_create_on_node+0x30/0x30
<4>[  431.279717]  ret_from_fork+0x3a/0x50
<0>[  431.279798] Dumping ftrace buffer:
<0>[  431.279939]    (ftrace buffer empty)