igt@gem_exec_parallel@engines@userptr - dmesg-warn - INFO: task kworker/.* blocked for more than 30 seconds.
Dmesg
<6> [293.256154] [IGT] gem_exec_parallel: starting dynamic subtest userptr
<7> [294.027206] i915 0000:00:02.0: [drm:intel_power_well_enable [i915]] enabling DC off
<7> [294.028646] i915 0000:00:02.0: [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
<3> [303.830154] INFO: task kworker/3:0:28 blocked for more than 30 seconds.
<3> [303.830543] Tainted: G U W 5.12.0-rc4-CI-CI_DRM_9907+ #1
<3> [303.830747] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
<6> [303.831238] task:kworker/3:0 state:D stack:12960 pid: 28 ppid: 2 flags:0x00004000
<6> [303.831325] Workqueue: usb_hub_wq hub_event
<6> [303.831391] Call Trace:
<6> [303.831457] __schedule+0x41f/0xa00
<6> [303.833631] schedule+0x38/0xe0
<6> [303.838778] usb_kill_urb+0xa7/0xe0
<6> [303.838838] ? finish_wait+0x80/0x80
<6> [303.842208] usb_hcd_flush_endpoint+0xca/0x180
<6> [303.842305] usb_disable_endpoint+0xa1/0xb0
<6> [303.842370] usb_disable_interface+0x37/0x50
<6> [303.842444] usb_unbind_interface+0x155/0x260
<6> [303.846855] device_release_driver_internal+0xf2/0x1d0
<6> [303.847039] bus_remove_device+0xed/0x160
<6> [303.847105] device_del+0x187/0x3e0
<6> [303.847199] usb_disable_device+0x87/0x1a0
<6> [303.847275] usb_disconnect+0xb9/0x2b0
<6> [303.847371] hub_event+0xa23/0x15a0
<6> [303.847607] process_one_work+0x270/0x5c0
<6> [303.847750] worker_thread+0x37/0x380
<6> [303.847829] ? process_one_work+0x5c0/0x5c0
<6> [303.847881] kthread+0x146/0x170
<6> [303.849624] ? kthread_park+0x80/0x80
<6> [303.849708] ret_from_fork+0x22/0x30
<4> [303.852200]
Showing all locks held in the system:
<4> [303.852245] 5 locks held by kworker/3:0/28:
<4> [303.852283] #0: ffff8881018d7538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1e6/0x5c0
<4> [303.852465] #1: ffffc9000011fe70 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x1e6/0x5c0
<4> [303.852629] #2: ffff8881033e6a18 (&dev->mutex){....}-{3:3}, at: hub_event+0x69/0x15a0
<4> [303.852773] #3: ffff8881036a5218 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x53/0x2b0
<4> [303.854808] #4: ffff88811b11d1a8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x15/0x1d0
<4> [303.855118] 1 lock held by khungtaskd/35:
<4> [303.855151] #0: ffffffff82732ca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x17a
<4> [303.858666] 2 locks held by kworker/u8:1/74:
<4> [303.858699] #0: ffff88817a83b298 (&rq->lock){-.-.}-{2:2}, at: __schedule+0xeb/0xa00
<4> [303.858868] #1: ffffc90000bfbe70 ((work_completion)(&i915->mm.free_work)){+.+.}-{0:0}, at: cpuacct_charge+0x44/0x200
<4> [303.859177] 3 locks held by kworker/2:2H/194:
<4> [303.859212] 1 lock held by in:imklog/339:
<4> [303.859243] 3 locks held by rs:main Q:Reg/340:
<4> [303.859288] 3 locks held by dmesg/873:
<4> [303.859318] 1 lock held by igt_runner/890:
<4> [303.859348] 2 locks held by gem_exec_parall/4074:
<4> [303.859378] #0: ffffc9000917fbc8 (reservation_ww_class_acquire){+.+.}-{0:0}, at: i915_gem_do_execbuffer+0xa44/0x1f80 [i915]
<4> [303.862447] #1: ffff888102cfd290 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_gem_ww_ctx_backoff+0xc3/0x150 [i915]
<4> [303.865015] 2 locks held by gem_exec_parall/4114:
<4> [303.865053] #0: ffffc900008d7bc8 (reservation_ww_class_acquire){+.+.}-{0:0}, at: i915_gem_do_execbuffer+0xa44/0x1f80 [i915]
<4> [303.868483] #1: ffff888102cfd290 (reservation_ww_class_mutex){+.+.}-{3:3}, at: i915_gem_ww_ctx_backoff+0xc3/0x150 [i915]