igt@dmabuf@all@dma_fence_chain - incomplete - Received signal SIGQUIT, INFO: task dmabuf/wait:\d+ blocked for more than 61 seconds.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_12211/shard-tglb1/igt@dmabuf@all@dma_fence_chain.html

Starting dynamic subtest: dma_fence_chain
Received signal SIGQUIT.
Stack trace: 
 #0 [fatal_sig_handler+0x113]
 #1 [killpg+0x40]
 #2 [syscall+0x1d]
 #3 [kmod_module_insert_module+0x93]
 #4 [kmod_module_probe_insert_module+0x38b]
 #5 [igt_kselftest_execute+0xd9]
 #6 [igt_kselftests+0x348]
 #7 [main+0x3a]
 #8 [__libc_start_main+0xf3]
 #9 [_start+0x2e]

<6> [222.468312] [IGT] dmabuf: starting dynamic subtest dma_fence_chain
<6> [222.484078] dma-buf: Running dma_fence_chain
<6> [222.484107] sizeof(dma_fence_chain)=184
<6> [222.485709] dma-buf: Running dma_fence_chain/sanitycheck
<6> [222.487288] dma-buf: Running dma_fence_chain/find_seqno
<6> [222.498429] dma-buf: Running dma_fence_chain/find_signaled
<6> [222.498893] dma-buf: Running dma_fence_chain/find_out_of_order
<6> [222.499475] dma-buf: Running dma_fence_chain/find_gap
<6> [222.512329] dma-buf: Running dma_fence_chain/find_race
<7> [224.890155] i915 0000:00:02.0: [drm:intel_pps_vdd_off_sync_unlocked [i915]] Turning [ENCODER:307:DDI A/PHY A] VDD off
<7> [224.892098] i915 0000:00:02.0: [drm:intel_pps_vdd_off_sync_unlocked [i915]] PP_STATUS: 0x80000008 PP_CONTROL: 0x00000067
<7> [224.893433] i915 0000:00:02.0: [drm:intel_power_well_disable [i915]] disabling DC_off
<7> [224.894926] i915 0000:00:02.0: [drm:skl_enable_dc6 [i915]] Enabling DC6
<7> [224.896182] i915 0000:00:02.0: [drm:gen9_set_dc_state.part.15 [i915]] Setting DC state from 00 to 02
<6> [227.964967] Completed 4095 cycles
<6> [228.127041] dma-buf: Running dma_fence_chain/signal_forward
<6> [228.136149] dma-buf: Running dma_fence_chain/signal_backward
<6> [228.160203] dma-buf: Running dma_fence_chain/wait_forward
<6> [228.631691] dma-buf: Running dma_fence_chain/wait_backward
<3> [291.961319] INFO: task dmabuf/wait:1310 blocked for more than 61 seconds.
<3> [291.961710]       Tainted: G     U  W          6.0.0-rc7-CI_DRM_12211-gd61e57aeb358+ #1
<3> [291.962116] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6> [291.962596] task:dmabuf/wait     state:D stack:15256 pid: 1310 ppid:     2 flags:0x00004000
<6> [291.962698] Call Trace:
<6> [291.962719]  <TASK>
<6> [291.962774]  __schedule+0x30b/0xa80
<6> [291.962999]  ? dma_fence_default_wait+0x105/0x240
<6> [291.963042]  ? dma_fence_default_wait+0x1fa/0x240
<6> [291.963088]  schedule+0x4e/0xd0
<6> [291.963127]  schedule_timeout+0x237/0x2e0
<6> [291.963202]  ? dma_fence_default_wait+0x21d/0x240
<6> [291.963253]  ? _raw_spin_unlock_irqrestore+0x54/0x70
<6> [291.963290]  ? dma_fence_default_wait+0x105/0x240
<6> [291.963345]  ? dma_fence_default_wait+0x105/0x240
<6> [291.963377]  ? dma_fence_default_wait+0x1fa/0x240
<6> [291.963410]  dma_fence_default_wait+0x225/0x240
<6> [291.963461]  ? dma_fence_add_callback+0xc0/0xc0
<6> [291.963533]  ? seqno_inc2+0x10/0x10 [dmabuf_selftests]
<6> [291.963628]  dma_fence_wait_timeout+0x1fd/0x220
<6> [291.963685]  __wait_fence_chains+0x15/0x30 [dmabuf_selftests]
<6> [291.963740]  kthread+0xed/0x120
<6> [291.963839]  ? kthread_complete_and_exit+0x20/0x20
<6> [291.963905]  ret_from_fork+0x1f/0x30
<6> [291.964079]  </TASK>
<4> [291.964113] 
Showing all locks held in the system:
<4> [291.964140] 1 lock held by rcu_tasks_kthre/11:
<4> [291.964166]  #0: ffffffff82736f50 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0x3c0
<4> [291.964284] 1 lock held by khungtaskd/54:
<4> [291.964298]  #0: ffffffff82737960 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a
<4> [291.964377] 1 lock held by in:imklog/416: