Bug 103525

Summary:	[CI] igt@gem_tiled_swapping@non-threaded - Incomplete - INFO: task gem_tiled_swapp blocked for more than 60 seconds.
Product:	DRI	Reporter:	Marta Löfstedt <marta.lofstedt>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED DUPLICATE	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	medium	CC:	intel-gfx-bugs, jani.saarinen
Version:	DRI git
Hardware:	Other
OS:	All
Whiteboard:	ReadyForDev
i915 platform:	HSW	i915 features:	GEM/Other

Description Marta Löfstedt 2017-10-31 09:11:32 UTC

On CI_DRM_3294 shard-hsw2 igt@gem_tiled_swapping@non-threaded


<14>[  495.250162] [IGT] gem_tiled_swapping: executing
<3>[  615.691911] INFO: task gem_tiled_swapp:6686 blocked for more than 60 seconds.
<3>[  615.691963]       Tainted: G     U          4.14.0-rc6-CI-CI_DRM_3294+ #1
<3>[  615.691996] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6>[  615.692033] gem_tiled_swapp D    0  6686   3317 0x00000000
<4>[  615.692042] Call Trace:
<4>[  615.692054]  __schedule+0x3c3/0xaf0
<4>[  615.692064]  schedule+0x40/0x90
<4>[  615.692071]  io_schedule+0x16/0x40
<4>[  615.692077]  __lock_page+0x10d/0x140
<4>[  615.692085]  ? add_to_page_cache_lru+0xd0/0xd0
<4>[  615.692094]  deferred_split_scan+0x25e/0x2b0
<4>[  615.692104]  shrink_slab.part.17+0x202/0x5e0
<4>[  615.692118]  shrink_node+0x2f7/0x300
<4>[  615.692129]  do_try_to_free_pages+0xc6/0x310
<4>[  615.692138]  try_to_free_pages+0x122/0x330
<4>[  615.692147]  __alloc_pages_nodemask+0x6f9/0x1380
<4>[  615.692167]  ksm_might_need_to_copy+0x84/0x210
<4>[  615.692176]  do_swap_page+0x1c0/0x7f0
<4>[  615.692185]  __handle_mm_fault+0x7ef/0xed0
<4>[  615.692198]  handle_mm_fault+0x156/0x300
<4>[  615.692204]  __get_user_pages+0x10a/0x5c0
<4>[  615.692210]  ? lock_acquire+0xb0/0x200
<4>[  615.692221]  populate_vma_page_range+0x71/0x80
<4>[  615.692226]  __mm_populate+0x97/0x110
<4>[  615.692233]  do_mlock+0xf5/0x230
<4>[  615.692240]  SyS_mlock+0x13/0x20
<4>[  615.692247]  entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[  615.692251] RIP: 0033:0x7fdabda9cdc7
<4>[  615.692254] RSP: 002b:00007ffee3c75e28 EFLAGS: 00000246 ORIG_RAX: 0000000000000095
<4>[  615.692261] RAX: ffffffffffffffda RBX: ffffffff81491ef3 RCX: 00007fdabda9cdc7
<4>[  615.692265] RDX: 0000000000000000 RSI: 00000003a9100000 RDI: 00007fd71367c010
<4>[  615.692268] RBP: ffffc90000707f88 R08: 0000561cce907480 R09: 0000000000000000
<4>[  615.692271] R10: 0000000000000073 R11: 0000000000000246 R12: 0000000000000000
<4>[  615.692275] R13: 00007ffee3c75fc0 R14: 0000000000000003 R15: 0000000000001000
<4>[  615.692282]  ? __this_cpu_preempt_check+0x13/0x20
<4>[  615.692290] 
<4>[  615.692290] Showing all locks held in the system:
<4>[  615.692305] 2 locks held by khungtaskd/66:
<4>[  615.692312]  #0:  (rcu_read_lock){....}, at: [<ffffffff8113f083>] watchdog+0xa3/0x610
<4>[  615.692331]  #1:  (tasklist_lock){.+.+}, at: [<ffffffff810d945d>] debug_show_all_locks+0x3d/0x1a0
<4>[  615.692358] 1 lock held by in:imklog/538:
<4>[  615.692361]  #0:  (&f->f_pos_lock){+.+.}, at: [<ffffffff81243233>] __fdget_pos+0x43/0x50
<4>[  615.692390] 1 lock held by dmesg/3085:
<4>[  615.692393]  #0:  (&user->lock){+.+.}, at: [<ffffffff810eefce>] devkmsg_read+0x3e/0x300
<4>[  615.692419] 2 locks held by gem_tiled_swapp/6686:
<4>[  615.692422]  #0:  (&mm->mmap_sem){++++}, at: [<ffffffff811cbb73>] __mm_populate+0xc3/0x110
<4>[  615.692438]  #1:  (shrinker_rwsem){++++}, at: [<ffffffff811a8dff>] shrink_slab.part.17+0x4f/0x5e0
<4>[  615.692456] 
<4>[  615.692459] =============================================
<4>[  615.692459] 
<4>[  615.692463] NMI backtrace for cpu 5
<4>[  615.692468] CPU: 5 PID: 66 Comm: khungtaskd Tainted: G     U          4.14.0-rc6-CI-CI_DRM_3294+ #1
<4>[  615.692471] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  615.692474] Call Trace:
<4>[  615.692481]  dump_stack+0x68/0x9f
<4>[  615.692487]  nmi_cpu_backtrace+0xbe/0xc0
<4>[  615.692495]  ? irq_force_complete_move+0xe0/0xe0
<4>[  615.692499]  nmi_trigger_cpumask_backtrace+0xc0/0x100
<4>[  615.692506]  arch_trigger_cpumask_backtrace+0x19/0x20
<4>[  615.692510]  watchdog+0x454/0x610
<4>[  615.692517]  kthread+0x114/0x150
<4>[  615.692521]  ? reset_hung_task_detector+0x20/0x20
<4>[  615.692525]  ? kthread_create_on_node+0x40/0x40
<4>[  615.692532]  ret_from_fork+0x27/0x40
<6>[  615.692544] Sending NMI from CPU 5 to CPUs 0-4,6-7:
<4>[  615.692557] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff819106fe
<4>[  615.692574] NMI backtrace for cpu 6 skipped: idling at pc 0xffffffff819106fe
<4>[  615.692578] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff819106fe
<4>[  615.692582] NMI backtrace for cpu 2 skipped: idling at pc 0xffffffff819106fe
<4>[  615.692586] NMI backtrace for cpu 4 skipped: idling at pc 0xffffffff819106fe
<4>[  615.692591] NMI backtrace for cpu 7 skipped: idling at pc 0xffffffff819106fe
<4>[  615.692595] NMI backtrace for cpu 3 skipped: idling at pc 0xffffffff819106fe
<0>[  615.693737] Kernel panic - not syncing: hung_task: blocked tasks
<4>[  615.693795] CPU: 5 PID: 66 Comm: khungtaskd Tainted: G     U          4.14.0-rc6-CI-CI_DRM_3294+ #1
<4>[  615.693872] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  615.693936] Call Trace:
<4>[  615.693966]  dump_stack+0x68/0x9f
<4>[  615.694002]  panic+0xd4/0x21d
<4>[  615.694041]  watchdog+0x460/0x610
<4>[  615.694079]  kthread+0x114/0x150
<4>[  615.694111]  ? reset_hung_task_detector+0x20/0x20
<4>[  615.694155]  ? kthread_create_on_node+0x40/0x40
<4>[  615.694200]  ret_from_fork+0x27/0x40
<0>[  615.694959] Kernel Offset: disabled

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3294/shard-hsw2/igt@gem_tiled_swapping@non-threaded.html

Comment 1 Marta Löfstedt 2017-11-07 08:38:13 UTC

Also, https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3316/shard-hsw8/igt@kms_flip@wf_vblank-vs-dpms.html

<7>[ 1243.196182] [drm:intel_power_well_disable [i915]] disabling always-on
<3>[ 1353.212534] INFO: task kms_flip:8510 blocked for more than 60 seconds.
<3>[ 1353.212535]       Tainted: G     U  W       4.14.0-rc8-CI-CI_DRM_3316+ #1
<3>[ 1353.212536] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6>[ 1353.212536] kms_flip        D    0  8510   8280 0x00000000
<4>[ 1353.212538] Call Trace:
<4>[ 1353.212542]  __schedule+0x3c3/0xaf0
<4>[ 1353.212544]  schedule+0x40/0x90
<4>[ 1353.212545]  schedule_preempt_disabled+0x18/0x30
<4>[ 1353.212547]  __mutex_lock+0x2bb/0x9b0
<4>[ 1353.212549]  ? drm_mode_getconnector+0x15c/0x3c0
<4>[ 1353.212551]  ? mutex_unlock+0x12/0x20
<4>[ 1353.212553]  mutex_lock_nested+0x1b/0x20
<4>[ 1353.212554]  ? mutex_lock_nested+0x1b/0x20
<4>[ 1353.212555]  drm_mode_getconnector+0x15c/0x3c0
<4>[ 1353.212557]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
<4>[ 1353.212559]  drm_ioctl_kernel+0x69/0xb0
<4>[ 1353.212560]  drm_ioctl+0x2f9/0x3d0
<4>[ 1353.212561]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
<4>[ 1353.212564]  ? __vfs_read+0x28/0x120
<4>[ 1353.212567]  do_vfs_ioctl+0x94/0x670
<4>[ 1353.212568]  ? vfs_read+0x12d/0x150
<4>[ 1353.212569]  SyS_ioctl+0x41/0x70
<4>[ 1353.212572]  entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[ 1353.212573] RIP: 0033:0x7fc4537bc587
<4>[ 1353.212573] RSP: 002b:00007ffe6d4cdfc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
<4>[ 1353.212574] RAX: ffffffffffffffda RBX: 00007ffe6d4cde80 RCX: 00007fc4537bc587
<4>[ 1353.212575] RDX: 00007ffe6d4ce000 RSI: 00000000c05064a7 RDI: 0000000000000003
<4>[ 1353.212575] RBP: 00007ffe6d4cde70 R08: 000055bcff51d7d0 R09: 0000000000000000
<4>[ 1353.212576] R10: 0000000000000073 R11: 0000000000000246 R12: 000055bcfe56fa68
<4>[ 1353.212577] R13: 00007ffe6d4ce040 R14: 0000000000000000 R15: ffffffffffffffff
<4>[ 1353.212579] INFO: lockdep is turned off.
<4>[ 1353.212579] NMI backtrace for cpu 0
<4>[ 1353.212581] CPU: 0 PID: 66 Comm: khungtaskd Tainted: G     U  W       4.14.0-rc8-CI-CI_DRM_3316+ #1
<4>[ 1353.212581] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[ 1353.212582] Call Trace:
<4>[ 1353.212584]  dump_stack+0x68/0x9f
<4>[ 1353.212585]  nmi_cpu_backtrace+0xbe/0xc0
<4>[ 1353.212587]  ? irq_force_complete_move+0xe0/0xe0
<4>[ 1353.212589]  nmi_trigger_cpumask_backtrace+0xc0/0x100
<4>[ 1353.212590]  arch_trigger_cpumask_backtrace+0x19/0x20
<4>[ 1353.212592]  watchdog+0x454/0x610
<4>[ 1353.212593]  kthread+0x114/0x150
<4>[ 1353.212594]  ? reset_hung_task_detector+0x20/0x20
<4>[ 1353.212595]  ? kthread_create_on_node+0x40/0x40
<4>[ 1353.212596]  ret_from_fork+0x27/0x40
<6>[ 1353.212599] Sending NMI from CPU 0 to CPUs 1-7:
<4>[ 1353.212718] NMI backtrace for cpu 5 skipped: idling at pc 0xffffffff81911925
<4>[ 1353.212720] NMI backtrace for cpu 2 skipped: idling at pc 0xffffffff81911925
<4>[ 1353.212721] NMI backtrace for cpu 7 skipped: idling at pc 0xffffffff81911925
<4>[ 1353.212723] NMI backtrace for cpu 3 skipped: idling at pc 0xffffffff81911925
<4>[ 1353.212724] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff81911925
<4>[ 1353.212726] NMI backtrace for cpu 6 skipped: idling at pc 0xffffffff81911925
<4>[ 1353.213601] NMI backtrace for cpu 4
<4>[ 1353.213601] CPU: 4 PID: 7402 Comm: kworker/4:0 Tainted: G     U  W       4.14.0-rc8-CI-CI_DRM_3316+ #1
<4>[ 1353.213602] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[ 1353.213602] Workqueue: events i915_hpd_poll_init_work [i915]
<4>[ 1353.213603] task: ffff8803f9bd2800 task.stack: ffffc90000388000
<4>[ 1353.213603] RIP: 0010:io_serial_in+0x18/0x20
<4>[ 1353.213603] RSP: 0018:ffffc9000038bad8 EFLAGS: 00000002
<4>[ 1353.213604] RAX: 0000000080000000 RBX: ffffffff836212c0 RCX: 0000000000000000
<4>[ 1353.213604] RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff836212c0
<4>[ 1353.213604] RBP: ffffc9000038bad8 R08: 0000000000000001 R09: 0000000000000001
<4>[ 1353.213605] R10: ffffc9000038bac8 R11: ffffffff815b0141 R12: 00000000000026fe
<4>[ 1353.213605] R13: 0000000000000020 R14: ffffffff82ca4efa R15: ffffffff836212c0
<4>[ 1353.213606] FS:  0000000000000000(0000) GS:ffff88041fb00000(0000) knlGS:0000000000000000
<4>[ 1353.213606] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[ 1353.213606] CR2: 00007fc45046c220 CR3: 0000000003e0f001 CR4: 00000000001606e0
<4>[ 1353.213606] Call Trace:
<4>[ 1353.213607]  wait_for_xmitr+0x41/0xa0
<4>[ 1353.213607]  serial8250_console_putchar+0x1c/0x30
<4>[ 1353.213607]  ? wait_for_xmitr+0xa0/0xa0
<4>[ 1353.213607]  uart_console_write+0x30/0x70
<4>[ 1353.213608]  serial8250_console_write+0xd9/0x270
<4>[ 1353.213608]  ? vt_console_print+0x225/0x3b0
<4>[ 1353.213608]  ? msg_print_text+0x9d/0x100
<4>[ 1353.213609]  univ8250_console_write+0x26/0x30
<4>[ 1353.213609]  console_unlock+0x430/0x570
<4>[ 1353.213609]  vprintk_emit+0x254/0x3b0
<4>[ 1353.213609]  ? wake_up_q+0x59/0x80
<4>[ 1353.213610]  vprintk_default+0x1f/0x30
<4>[ 1353.213610]  vprintk_func+0x2c/0x90
<4>[ 1353.213610]  printk+0x43/0x4b
<4>[ 1353.213610]  ? drm_helper_hpd_irq_event+0xcc/0x110
<4>[ 1353.213611]  drm_printk+0x8e/0x90
<4>[ 1353.213611]  drm_helper_hpd_irq_event+0xcc/0x110
<4>[ 1353.213611]  i915_hpd_poll_init_work+0xc5/0x100 [i915]
<4>[ 1353.213612]  process_one_work+0x221/0x650
<4>[ 1353.213612]  worker_thread+0x4e/0x3c0
<4>[ 1353.213612]  kthread+0x114/0x150
<4>[ 1353.213612]  ? process_one_work+0x650/0x650
<4>[ 1353.213613]  ? kthread_create_on_node+0x40/0x40
<4>[ 1353.213613]  ret_from_fork+0x27/0x40
<4>[ 1353.213613] Code: 48 89 e5 d3 e6 48 63 f6 48 03 77 40 8b 06 5d c3 0f 1f 00 0f 1f 44 00 00 0f b6 8f d1 00 00 00 8b 57 38 55 48 89 e5 d3 e6 01 f2 ec <0f> b6 c0 5d c3 0f 1f 00 0f 1f 44 00 00 0f b6 8f d1 00 00 00 89 
<0>[ 1353.213626] Kernel panic - not syncing: hung_task: blocked tasks
<4>[ 1353.213627] CPU: 0 PID: 66 Comm: khungtaskd Tainted: G     U  W       4.14.0-rc8-CI-CI_DRM_3316+ #1
<4>[ 1353.213627] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[ 1353.213628] Call Trace:
<4>[ 1353.213629]  dump_stack+0x68/0x9f
<4>[ 1353.213631]  panic+0xd4/0x21d
<4>[ 1353.213633]  watchdog+0x460/0x610
<4>[ 1353.213635]  kthread+0x114/0x150
<4>[ 1353.213636]  ? reset_hung_task_detector+0x20/0x20
<4>[ 1353.213636]  ? kthread_create_on_node+0x40/0x40
<4>[ 1353.213637]  ret_from_fork+0x27/0x40
<0>[ 1353.217854] Kernel Offset: disabled

Comment 2 Marta Löfstedt 2017-11-07 08:39:17 UTC

Also, https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3315/shard-hsw8/igt@kms_flip@wf_vblank-vs-dpms-interruptible.html

<7>[  436.933396] [drm:intel_power_well_disable [i915]] disabling always-on
<3>[  553.953286] INFO: task kms_flip:3392 blocked for more than 60 seconds.
<3>[  553.953287]       Tainted: G     U          4.14.0-rc8-CI-CI_DRM_3315+ #1
<3>[  553.953288] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6>[  553.953288] kms_flip        D    0  3392   2292 0x00000004
<4>[  553.953290] Call Trace:
<4>[  553.953294]  __schedule+0x3c3/0xaf0
<4>[  553.953295]  schedule+0x40/0x90
<4>[  553.953296]  schedule_preempt_disabled+0x18/0x30
<4>[  553.953298]  __mutex_lock+0x2bb/0x9b0
<4>[  553.953300]  ? drm_mode_getconnector+0x15c/0x3c0
<4>[  553.953302]  ? mutex_unlock+0x12/0x20
<4>[  553.953303]  mutex_lock_nested+0x1b/0x20
<4>[  553.953304]  ? mutex_lock_nested+0x1b/0x20
<4>[  553.953305]  drm_mode_getconnector+0x15c/0x3c0
<4>[  553.953307]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
<4>[  553.953308]  drm_ioctl_kernel+0x69/0xb0
<4>[  553.953310]  drm_ioctl+0x2f9/0x3d0
<4>[  553.953310]  ? drm_mode_connector_property_set_ioctl+0x40/0x40
<4>[  553.953313]  ? __vfs_read+0x28/0x120
<4>[  553.953315]  do_vfs_ioctl+0x94/0x670
<4>[  553.953316]  ? vfs_read+0x12d/0x150
<4>[  553.953317]  SyS_ioctl+0x41/0x70
<4>[  553.953319]  entry_SYSCALL_64_fastpath+0x1c/0xb1
<4>[  553.953320] RIP: 0033:0x7f983e910587
<4>[  553.953320] RSP: 002b:00007ffd130688d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
<4>[  553.953321] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f983e910587
<4>[  553.953321] RDX: 00007ffd13068910 RSI: 00000000c05064a7 RDI: 0000000000000003
<4>[  553.953322] RBP: 00007ffd130689f0 R08: 000056182f177ca0 R09: 0000000000000000
<4>[  553.953322] R10: 0000000000000073 R11: 0000000000000246 R12: 00000000c01064ab
<4>[  553.953323] R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000004
<4>[  553.953324] INFO: lockdep is turned off.
<4>[  553.953325] NMI backtrace for cpu 1
<4>[  553.953326] CPU: 1 PID: 66 Comm: khungtaskd Tainted: G     U          4.14.0-rc8-CI-CI_DRM_3315+ #1
<4>[  553.953326] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  553.953327] Call Trace:
<4>[  553.953328]  dump_stack+0x68/0x9f
<4>[  553.953330]  nmi_cpu_backtrace+0xbe/0xc0
<4>[  553.953333]  ? irq_force_complete_move+0xe0/0xe0
<4>[  553.953333]  nmi_trigger_cpumask_backtrace+0xc0/0x100
<4>[  553.953335]  arch_trigger_cpumask_backtrace+0x19/0x20
<4>[  553.953336]  watchdog+0x454/0x610
<4>[  553.953338]  kthread+0x114/0x150
<4>[  553.953338]  ? reset_hung_task_detector+0x20/0x20
<4>[  553.953339]  ? kthread_create_on_node+0x40/0x40
<4>[  553.953340]  ret_from_fork+0x27/0x40
<6>[  553.953341] Sending NMI from CPU 1 to CPUs 0,2-7:
<4>[  553.953459] NMI backtrace for cpu 5 skipped: idling at pc 0xffffffff81911925
<4>[  553.953460] NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff81911925
<4>[  553.953462] NMI backtrace for cpu 6 skipped: idling at pc 0xffffffff81911925
<4>[  553.953463] NMI backtrace for cpu 7 skipped: idling at pc 0xffffffff81911925
<4>[  553.953465] NMI backtrace for cpu 2 skipped: idling at pc 0xffffffff81911925
<4>[  553.953466] NMI backtrace for cpu 3 skipped: idling at pc 0xffffffff81911925
<4>[  553.954343] NMI backtrace for cpu 4
<4>[  553.954344] CPU: 4 PID: 224 Comm: kworker/4:2 Tainted: G     U          4.14.0-rc8-CI-CI_DRM_3315+ #1
<4>[  553.954344] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  553.954344] Workqueue: events i915_hpd_poll_init_work [i915]
<4>[  553.954345] task: ffff88040a628040 task.stack: ffffc90000388000
<4>[  553.954345] RIP: 0010:io_serial_in+0x18/0x20
<4>[  553.954345] RSP: 0018:ffffc9000038bad8 EFLAGS: 00000002
<4>[  553.954346] RAX: 0000000080000000 RBX: ffffffff836212c0 RCX: 0000000000000000
<4>[  553.954346] RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff836212c0
<4>[  553.954346] RBP: ffffc9000038bad8 R08: 0000000000000001 R09: 0000000000000001
<4>[  553.954346] R10: ffffc9000038bac8 R11: ffffffff815b0141 R12: 0000000000002706
<4>[  553.954347] R13: 0000000000000020 R14: ffffffff82ca4f0d R15: ffffffff836212c0
<4>[  553.954347] FS:  0000000000000000(0000) GS:ffff88041fb00000(0000) knlGS:0000000000000000
<4>[  553.954347] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[  553.954347] CR2: 00007f983b5c0220 CR3: 0000000003e0f006 CR4: 00000000001606e0
<4>[  553.954347] Call Trace:
<4>[  553.954348]  wait_for_xmitr+0x41/0xa0
<4>[  553.954348]  serial8250_console_putchar+0x1c/0x30
<4>[  553.954348]  ? wait_for_xmitr+0xa0/0xa0
<4>[  553.954348]  uart_console_write+0x30/0x70
<4>[  553.954348]  serial8250_console_write+0xd9/0x270
<4>[  553.954349]  ? vt_console_print+0x225/0x3b0
<4>[  553.954349]  ? msg_print_text+0x9d/0x100
<4>[  553.954349]  univ8250_console_write+0x26/0x30
<4>[  553.954349]  console_unlock+0x430/0x570
<4>[  553.954350]  vprintk_emit+0x254/0x3b0
<4>[  553.954350]  ? wake_up_q+0x59/0x80
<4>[  553.954350]  vprintk_default+0x1f/0x30
<4>[  553.954350]  vprintk_func+0x2c/0x90
<4>[  553.954351]  printk+0x43/0x4b
<4>[  553.954351]  ? drm_helper_hpd_irq_event+0xcc/0x110
<4>[  553.954351]  drm_printk+0x8e/0x90
<4>[  553.954351]  drm_helper_hpd_irq_event+0xcc/0x110
<4>[  553.954352]  i915_hpd_poll_init_work+0xc5/0x100 [i915]
<4>[  553.954352]  process_one_work+0x221/0x650
<4>[  553.954352]  worker_thread+0x4e/0x3c0
<4>[  553.954352]  kthread+0x114/0x150
<4>[  553.954352]  ? process_one_work+0x650/0x650
<4>[  553.954353]  ? kthread_create_on_node+0x40/0x40
<4>[  553.954353]  ret_from_fork+0x27/0x40
<4>[  553.954353] Code: 48 89 e5 d3 e6 48 63 f6 48 03 77 40 8b 06 5d c3 0f 1f 00 0f 1f 44 00 00 0f b6 8f d1 00 00 00 8b 57 38 55 48 89 e5 d3 e6 01 f2 ec <0f> b6 c0 5d c3 0f 1f 00 0f 1f 44 00 00 0f b6 8f d1 00 00 00 89 
<0>[  553.954371] Kernel panic - not syncing: hung_task: blocked tasks
<4>[  553.954372] CPU: 1 PID: 66 Comm: khungtaskd Tainted: G     U          4.14.0-rc8-CI-CI_DRM_3315+ #1
<4>[  553.954373] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[  553.954373] Call Trace:
<4>[  553.954374]  dump_stack+0x68/0x9f
<4>[  553.954375]  panic+0xd4/0x21d
<4>[  553.954377]  watchdog+0x460/0x610
<4>[  553.954378]  kthread+0x114/0x150
<4>[  553.954379]  ? reset_hung_task_detector+0x20/0x20
<4>[  553.954379]  ? kthread_create_on_node+0x40/0x40
<4>[  553.954380]  ret_from_fork+0x27/0x40
<0>[  553.956376] Kernel Offset: disabled

Comment 3 Marta Löfstedt 2017-11-07 08:51:22 UTC

*** Bug 103027 has been marked as a duplicate of this bug. ***

Comment 4 Daniel Vetter 2017-11-07 09:05:53 UTC

I looked at the 2 examples linked, and the common issue seems to be that we're stuck somewhere in the uart transmit, within printk, which can be called from anywhere and so block any other task.

So either the serial console can't keep up, or it's broken.

Example backtrace:

<4>[  553.954347] Call Trace:
<4>[  553.954348]  wait_for_xmitr+0x41/0xa0
<4>[  553.954348]  serial8250_console_putchar+0x1c/0x30
<4>[  553.954348]  ? wait_for_xmitr+0xa0/0xa0
<4>[  553.954348]  uart_console_write+0x30/0x70
<4>[  553.954348]  serial8250_console_write+0xd9/0x270
<4>[  553.954349]  ? vt_console_print+0x225/0x3b0
<4>[  553.954349]  ? msg_print_text+0x9d/0x100
<4>[  553.954349]  univ8250_console_write+0x26/0x30
<4>[  553.954349]  console_unlock+0x430/0x570
<4>[  553.954350]  vprintk_emit+0x254/0x3b0
<4>[  553.954350]  ? wake_up_q+0x59/0x80
<4>[  553.954350]  vprintk_default+0x1f/0x30
<4>[  553.954350]  vprintk_func+0x2c/0x90
<4>[  553.954351]  printk+0x43/0x4b

above is the common part that would identify this bug, below can vary depending upon who's stuck and why:

<4>[  553.954351]  ? drm_helper_hpd_irq_event+0xcc/0x110
<4>[  553.954351]  drm_printk+0x8e/0x90
<4>[  553.954351]  drm_helper_hpd_irq_event+0xcc/0x110
<4>[  553.954352]  i915_hpd_poll_init_work+0xc5/0x100 [i915]
<4>[  553.954352]  process_one_work+0x221/0x650
<4>[  553.954352]  worker_thread+0x4e/0x3c0
<4>[  553.954352]  kthread+0x114/0x150
<4>[  553.954352]  ? process_one_work+0x650/0x650
<4>[  553.954353]  ? kthread_create_on_node+0x40/0x40
<4>[  553.954353]  ret_from_fork+0x27/0x40

Comment 5 Daniel Vetter 2017-11-07 10:36:53 UTC

Tomi just said that only hsw8 had the uart enabled, which means the gem_tiled_swapping issue seen on hsw2 is probably different.

Marta, can you pls split the bug?

Comment 6 Marta Löfstedt 2017-11-07 10:43:02 UTC

(In reply to Marta Löfstedt from comment #3)
> *** Bug 103027 has been marked as a duplicate of this bug. ***

This duplication is wrong!

Comment 7 Marta Löfstedt 2017-11-07 10:50:36 UTC

Note the kms_flip uart thing has been unduplicated to bug 103608

Comment 8 Daniel Vetter 2017-11-07 10:52:04 UTC

Remaining issue is this one here:

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3294/shard-hsw2/dmesg-1509374771_Panic_1.log

Comment 9 Marta Löfstedt 2018-01-11 08:24:29 UTC

I will duplicate this on bug 104218 since igt@gem_tiled_swapping@non-threaded seem to be causing a lot of incompletes either for itself or to any random test ran after.

*** This bug has been marked as a duplicate of bug 104218 ***

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