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https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8078/shard-skl10/igt@gem_ctx_persistence@close-replace-race.html#dmesg-warnings23

<6> [206.129674] [IGT] gem_ctx_persistence: starting subtest close-replace-race
<7> [206.258953] i915 0000:00:02.0: [drm:i915_gem_context_create_ioctl [i915]] HW context 1 created
<7> [206.272856] i915 0000:00:02.0: [drm:i915_gem_context_create_ioctl [i915]] HW context 1 created
<7> [207.204707] i915 0000:00:02.0: [drm:edp_panel_vdd_off_sync [i915]] Turning [ENCODER:94:DDI A] VDD off
<7> [207.205339] i915 0000:00:02.0: [drm:edp_panel_vdd_off_sync [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000007
<3> [309.604167] INFO: task gem_ctx_persist:1036 blocked for more than 61 seconds.
<3> [309.604450]       Tainted: G     U  W         5.6.0-rc4-CI-CI_DRM_8078+ #1
<3> [309.604574] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6> [309.604716] gem_ctx_persist D13240  1036    981 0x00000000
<4> [309.604746] Call Trace:
<4> [309.604793]  ? __schedule+0x2e5/0x800
<4> [309.604836]  schedule+0x37/0xe0
<4> [309.604859]  schedule_preempt_disabled+0xf/0x20
<4> [309.604874]  __mutex_lock+0x281/0x9c0
<4> [309.605517]  ? context_close+0x64/0x410 [i915]
<4> [309.605983]  ? i915_gem_context_create_ioctl+0x180/0x180 [i915]
<4> [309.606501]  ? context_close+0x64/0x410 [i915]
<4> [309.606912]  context_close+0x64/0x410 [i915]
<4> [309.607419]  ? i915_gem_context_create_ioctl+0x180/0x180 [i915]
<4> [309.607817]  i915_gem_context_destroy_ioctl+0x2a/0x40 [i915]
<4> [309.607851]  drm_ioctl_kernel+0xad/0xf0
<4> [309.608098]  drm_ioctl+0x2e1/0x390
<4> [309.608511]  ? i915_gem_context_create_ioctl+0x180/0x180 [i915]
<4> [309.608638]  ksys_ioctl+0x7b/0x90
<4> [309.608689]  __x64_sys_ioctl+0x11/0x20
<4> [309.608714]  do_syscall_64+0x4f/0x220
<4> [309.608749]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
<4> [309.608774] RIP: 0033:0x7f1ebde225d7
<4> [309.608811] Code: Bad RIP value.
<4> [309.608831] RSP: 002b:00007ffdd0474848 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
<4> [309.608859] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f1ebde225d7
<4> [309.608878] RDX: 00007ffdd0474880 RSI: 000000004008646e RDI: 0000000000000005
<4> [309.609033] RBP: 00007ffdd0474880 R08: 0000000000000000 R09: 0000000100005000
<4> [309.609053] R10: 0000000000000001 R11: 0000000000000246 R12: 000000004008646e
<4> [309.609076] R13: 0000000000000005 R14: 0000557c386cb240 R15: 0000000000000000
<4> [309.609184] 
Showing all locks held in the system:
<4> [309.609216] 1 lock held by khungtaskd/32:
<4> [309.609234]  #0: ffffffff82649d60 (rcu_read_lock){....}, at: debug_show_all_locks+0xe/0x1a0
<4> [309.609307] 4 locks held by rs:main Q:Reg/393:
<4> [309.609340] 4 locks held by dmesg/963:
<4> [309.609360] 1 lock held by gem_ctx_persist/1036:
<4> [309.609382]  #0: ffff88816aeeb550 (&ctx->mutex){+.+.}, at: context_close+0x64/0x410 [i915]
<4> [309.609834] 2 locks held by gem_ctx_persist/1037:
<4> [309.609854] 2 locks held by gem_ctx_persist/1038:
<4> [309.609874] 1 lock held by gem_ctx_persist/1040: