[Bug 104218] [CI] igt at gem_tiled_swapping@non-threaded - cause incompletes on following tests

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104218

--- Comment #17 from Marta Löfstedt <marta.lofstedt at intel.com> ---
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3600/shard-hsw2/igt@drv_suspend@fence-restore-tiled2untiled.html

last test in run.log:
running: igt/gem_tiled_swapping/non-threaded

pstore:
<14>[  115.538394] [IGT] drv_suspend: executing
<14>[  115.565337] [IGT] drv_suspend: starting subtest
fence-restore-tiled2untiled
<6>[  115.666004] PM: suspend entry (deep)
<6>[  115.666007] PM: Syncing filesystems ... done.
<6>[  115.687994] Freezing user space processes ... 
<3>[  123.825063] INFO: task kswapd0:79 blocked for more than 60 seconds.
<3>[  123.825086]       Tainted: G     U           4.15.0-rc6-CI-CI_DRM_3600+
#1
<3>[  123.825104] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
<6>[  123.825123] kswapd0         D    0    79      2 0x80000000
<4>[  123.825140] Call Trace:
<4>[  123.825148]  ? __schedule+0x3c3/0xaf0
<4>[  123.825156]  schedule+0x37/0x90
<4>[  123.825160]  io_schedule+0xd/0x30
<4>[  123.825164]  __lock_page+0x107/0x130
<4>[  123.825169]  ? add_to_page_cache_lru+0xc0/0xc0
<4>[  123.825176]  deferred_split_scan+0x25a/0x2b0
<4>[  123.825183]  shrink_slab.part.17+0x201/0x5d0
<4>[  123.825194]  shrink_node+0x2fd/0x310
<4>[  123.825201]  kswapd+0x31c/0x910
<4>[  123.825212]  kthread+0xfb/0x130
<4>[  123.825215]  ? mem_cgroup_shrink_node+0x300/0x300
<4>[  123.825217]  ? _kthread_create_on_node+0x30/0x30
<4>[  123.825223]  ret_from_fork+0x24/0x30
<4>[  123.825231] 
<4>[  123.825231] Showing all locks held in the system:
<4>[  123.825236] 2 locks held by khungtaskd/66:
<4>[  123.825240]  #0:  (rcu_read_lock){....}, at: [<00000000cdb621f1>]
watchdog+0x9b/0x5e0
<4>[  123.825251]  #1:  (tasklist_lock){.+.+}, at: [<000000001ce28407>]
debug_show_all_locks+0x37/0x190
<4>[  123.825262] 1 lock held by kswapd0/79:
<4>[  123.825264]  #0:  (shrinker_rwsem){++++}, at: [<0000000024cf4e12>]
shrink_slab.part.17+0x46/0x5d0
<4>[  123.825281] 4 locks held by rtcwake/1826:
<4>[  123.825282]  #0:  (sb_writers#5){.+.+}, at: [<00000000ec581cf0>]
vfs_write+0x158/0x1b0
<4>[  123.825292]  #1:  (&of->mutex){+.+.}, at: [<00000000b1aae5e2>]
kernfs_fop_write+0xd9/0x1a0
<4>[  123.825303]  #2:  (kn->count#132){.+.+}, at: [<00000000f959bbda>]
kernfs_fop_write+0xe2/0x1a0
<4>[  123.825313]  #3:  (pm_mutex){+.+.}, at: [<0000000013ef834e>]
pm_suspend+0x9b/0x9d0
<4>[  123.825323] 
<4>[  123.825324] =============================================
<4>[  123.825324] 
<4>[  123.825327] NMI backtrace for cpu 0
<4>[  123.825330] CPU: 0 PID: 66 Comm: khungtaskd Tainted: G     U          
4.15.0-rc6-CI-CI_DRM_3600+ #1
<4>[  123.825332] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12
02/15/2016
<4>[  123.825333] Call Trace:
<4>[  123.825337]  dump_stack+0x5f/0x86
<4>[  123.825340]  nmi_cpu_backtrace+0xb4/0xc0
<4>[  123.825346]  ? lapic_can_unplug_cpu+0x90/0x90
<4>[  123.825349]  nmi_trigger_cpumask_backtrace+0xb8/0xf0
<4>[  123.825353]  watchdog+0x43e/0x5e0
<4>[  123.825358]  kthread+0xfb/0x130
<4>[  123.825360]  ? reset_hung_task_detector+0x10/0x10
<4>[  123.825362]  ? _kthread_create_on_node+0x30/0x30
<4>[  123.825366]  ret_from_fork+0x24/0x30
<6>[  123.825375] Sending NMI from CPU 0 to CPUs 1-7:
<4>[  123.825383] NMI backtrace for cpu 4 skipped: idling at
intel_idle+0x6f/0x120
<4>[  123.825394] NMI backtrace for cpu 7 skipped: idling at
intel_idle+0x6f/0x120
<4>[  123.825397] NMI backtrace for cpu 3 skipped: idling at
intel_idle+0x6f/0x120
<4>[  123.825400] NMI backtrace for cpu 5 skipped: idling at
intel_idle+0x6f/0x120
<4>[  123.825403] NMI backtrace for cpu 1 skipped: idling at
intel_idle+0x6f/0x120
<4>[  123.825407] NMI backtrace for cpu 6 skipped: idling at
intel_idle+0x6f/0x120
<4>[  123.825410] NMI backtrace for cpu 2 skipped: idling at
intel_idle+0x6f/0x120
<0>[  123.826383] Kernel panic - not syncing: hung_task: blocked tasks
<4>[  123.826400] CPU: 0 PID: 66 Comm: khungtaskd Tainted: G     U          
4.15.0-rc6-CI-CI_DRM_3600+ #1
<4>[  123.826421] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12
02/15/2016
<4>[  123.826439] Call Trace:
<4>[  123.826448]  dump_stack+0x5f/0x86
<4>[  123.826459]  panic+0xcf/0x20d
<4>[  123.826474]  watchdog+0x44a/0x5e0
<4>[  123.826486]  kthread+0xfb/0x130
<4>[  123.826496]  ? reset_hung_task_detector+0x10/0x10
<4>[  123.826508]  ? _kthread_create_on_node+0x30/0x30
<4>[  123.826522]  ret_from_fork+0x24/0x30
<0>[  123.826922] Dumping ftrace buffer:
<0>[  123.826995]    (ftrace buffer empty)
<0>[  123.827006] Kernel Offset: disabled

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