igt@i915_selftest@live@blt - incomplete - WARNING: .* at kernel/workqueue.c:\d+ __queue_work.*

https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_20053/fi-bdw-5557u/igt@i915_selftest@live@blt.html#dmesg-warnings271

<4> [276.958769] WARNING: CPU: 0 PID: 358 at kernel/workqueue.c:1418 __queue_work+0x2d2/0x620
<4> [276.958777] Modules linked in: i915(+) vgem snd_hda_codec_hdmi mei_hdcp x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel lpc_ich snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core snd_pcm e1000e mei_me ptp mei pps_core prime_numbers [last unloaded: i915]
<4> [276.958826] CPU: 0 PID: 358 Comm: kworker/0:3 Tainted: G     U            5.12.0-CI-Patchwork_20053+ #1
<4> [276.958829] Hardware name:  /NUC5i7RYB, BIOS RYBDWi35.86A.0362.2017.0118.0940 01/18/2017
<4> [276.958832] Workqueue: events pool_free_work [i915]
<4> [276.958971] RIP: 0010:__queue_work+0x2d2/0x620
<4> [276.958976] Code: 00 00 01 0f 84 94 fd ff ff 65 8b 05 68 77 f4 7e a9 00 01 ff 00 75 13 65 48 8b 3c 25 40 6f 01 00 f6 47 2c 20 0f 85 aa 02 00 00 <0f> 0b 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b 05 9e 1d
<4> [276.958979] RSP: 0018:ffffc9000034fd78 EFLAGS: 00010006
<4> [276.958983] RAX: ffff88824e83ee00 RBX: ffff88815d28a420 RCX: 0000000000000001
<4> [276.958986] RDX: ffff88815d28a420 RSI: ffff88811888e400 RDI: ffff888116e22980
<4> [276.958988] RBP: ffffc9000034fdb0 R08: 0000000000000001 R09: 0000000000000001
<4> [276.958990] R10: 00000000997e0709 R11: 00000000789f54b1 R12: ffff88811888e400
<4> [276.958993] R13: 0000000000000010 R14: 0000000000000010 R15: ffff88815d28c820
<4> [276.958995] FS:  0000000000000000(0000) GS:ffff88824e800000(0000) knlGS:0000000000000000
<4> [276.958998] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [276.959000] CR2: 000055fd8b998748 CR3: 0000000005612002 CR4: 00000000003706f0
<4> [276.959003] Call Trace:
<4> [276.959009]  queue_work_on+0x68/0x80
<4> [276.959016]  node_free+0x43/0x60 [i915]
<4> [276.959140]  pool_free_older_than+0x132/0x170 [i915]
<4> [276.959270]  pool_free_work+0x12/0x40 [i915]
<4> [276.959395]  process_one_work+0x270/0x5c0
<4> [276.959407]  worker_thread+0x37/0x380
<4> [276.959414]  ? process_one_work+0x5c0/0x5c0
<4> [276.959418]  kthread+0x146/0x170
<4> [276.959423]  ? kthread_park+0x80/0x80
<4> [276.959429]  ret_from_fork+0x22/0x30
<4> [276.959443] irq event stamp: 3488972
<4> [276.959446] hardirqs last  enabled at (3488971): [<ffffffff81ab6960>] _raw_spin_unlock_irqrestore+0x50/0x60
<4> [276.959450] hardirqs last disabled at (3488972): [<ffffffff810cfb4c>] queue_work_on+0x4c/0x80
<4> [276.959455] softirqs last  enabled at (3488950): [<ffffffff81e00342>] __do_softirq+0x342/0x48e
<4> [276.959459] softirqs last disabled at (3488295): [<ffffffff810b46cd>] irq_exit_rcu+0xad/0xd0
<4> [276.959464] ---[ end trace 8e14f6d659c8db85 ]---