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

https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_1234/fi-kbl-soraka/igt@dmabuf@all@dma_fence_chain.html

<6> [391.394515] [IGT] dmabuf: starting dynamic subtest dma_fence_chain
<6> [391.432228] dma-buf: Running dma_fence_chain
<6> [391.432255] sizeof(dma_fence_chain)=184
<6> [391.436017] dma-buf: Running dma_fence_chain/sanitycheck
<6> [391.439743] dma-buf: Running dma_fence_chain/find_seqno
<6> [391.469179] dma-buf: Running dma_fence_chain/find_signaled
<6> [391.471318] dma-buf: Running dma_fence_chain/find_out_of_order
<6> [391.472845] dma-buf: Running dma_fence_chain/find_gap
<6> [391.500590] dma-buf: Running dma_fence_chain/find_race
<6> [397.164615] Completed 1621 cycles
<6> [397.664935] dma-buf: Running dma_fence_chain/signal_forward
<6> [397.686923] dma-buf: Running dma_fence_chain/signal_backward
<6> [397.753517] dma-buf: Running dma_fence_chain/wait_forward
<6> [398.748288] dma-buf: Running dma_fence_chain/wait_backward
<3> [493.909685] INFO: task dmabuf/wait:1148 blocked for more than 61 seconds.
<3> [493.910495]       Tainted: G        W          6.0.0-rc7-drmtip_1234-gc53a5e48e040+ #1
<3> [493.911048] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6> [493.911766] task:dmabuf/wait     state:D stack:15256 pid: 1148 ppid:     2 flags:0x00004000
<6> [493.911851] Call Trace:
<6> [493.911877]  <TASK>
<6> [493.911957]  __schedule+0x30b/0xa80
<6> [493.912070]  ? dma_fence_default_wait+0x105/0x240
<6> [493.912115]  ? dma_fence_default_wait+0x1fa/0x240
<6> [493.912172]  schedule+0x4e/0xd0
<6> [493.912221]  schedule_timeout+0x237/0x2e0
<6> [493.912318]  ? dma_fence_default_wait+0x21d/0x240
<6> [493.912469]  ? _raw_spin_unlock_irqrestore+0x54/0x70
<6> [493.912515]  ? dma_fence_default_wait+0x105/0x240
<6> [493.912590]  ? dma_fence_default_wait+0x105/0x240
<6> [493.912628]  ? dma_fence_default_wait+0x1fa/0x240
<6> [493.912668]  dma_fence_default_wait+0x225/0x240
<6> [493.912735]  ? dma_fence_add_callback+0xc0/0xc0
<6> [493.912832]  ? seqno_inc2+0x10/0x10 [dmabuf_selftests]
<6> [493.912907]  dma_fence_wait_timeout+0x1fd/0x220
<6> [493.912975]  __wait_fence_chains+0x15/0x30 [dmabuf_selftests]
<6> [493.913036]  kthread+0xed/0x120
<6> [493.913074]  ? kthread_complete_and_exit+0x20/0x20
<6> [493.913153]  ret_from_fork+0x1f/0x30
<6> [493.913369]  </TASK>
<4> [493.913556] 
Showing all locks held in the system:
<4> [493.913588] 1 lock held by rcu_tasks_kthre/11:
<4> [493.913619]  #0: ffffffff82736f10 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0x3c0
<4> [493.913791] 1 lock held by khungtaskd/35:
<4> [493.913820]  #0: ffffffff82737920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a
<4> [493.913983] 1 lock held by in:imklog/376:
<4> [493.914034] 3 locks held by dmesg/929:
<4> [493.914075] 1 lock held by dmabuf/1131:
<4> [493.914105] 
<4> [493.914128] =============================================
<6> [521.481008] Console: switching to colour frame buffer device 300x100