https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6410/shard-skl9/igt@i915_selftest@mock_requests.html <6> [2426.945339] i915: Running i915_request_mock_selftests/mock_breadcrumbs_smoketest <6> [2429.657926] Completed 11 waits for 8944 fence across 4 cpus <4> [2430.053786] WARNING: CPU: 2 PID: 2615 at kernel/workqueue.c:1415 __queue_work+0x52f/0x670 <4> [2430.053816] Modules linked in: i915(+) vgem snd_hda_codec_hdmi x86_pkg_temp_thermal coretemp snd_hda_codec crct10dif_pclmul crc32_pclmul snd_hwdep btusb snd_hda_core btrtl ghash_clmulni_intel btbcm btintel snd_pcm bluetooth cdc_ether usbnet r8152 ecdh_generic mii ecc i2c_hid pinctrl_sunrisepoint pinctrl_intel prime_numbers [last unloaded: i915] <4> [2430.053918] CPU: 2 PID: 2615 Comm: kworker/u8:4 Tainted: G U 5.2.0-rc7-CI-CI_DRM_6410+ #1 <4> [2430.053931] Hardware name: Google Caroline/Caroline, BIOS MrChromebox 08/27/2018 <4> [2430.054283] Workqueue: mock contexts_free_worker [i915] <4> [2430.054309] RIP: 0010:__queue_work+0x52f/0x670 <4> [2430.054326] Code: 24 01 01 e8 03 19 04 00 e9 9f fc ff ff 65 8b 05 ef 69 f4 7e a9 00 01 1f 00 75 0f 65 48 8b 3c 25 80 5e 01 00 f6 47 24 20 75 6f <0f> 0b 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b e9 4c fc <4> [2430.054338] RSP: 0018:ffffc900000f4eb0 EFLAGS: 00010006 <4> [2430.054355] RAX: 0000000080000101 RBX: ffff88816d9e8010 RCX: 0000000000000000 <4> [2430.054367] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffff <4> [2430.054379] RBP: ffffc900000f4ee8 R08: 0000000000000000 R09: 0000000000000001 <4> [2430.054391] R10: ffffc900000f4eb0 R11: 0000000000000000 R12: ffff888176fd71b8 <4> [2430.054403] R13: 0000000000000010 R14: 0000000000000010 R15: ffffffff8113bd02 <4> [2430.054417] FS: 0000000000000000(0000) GS:ffff88817ab00000(0000) knlGS:0000000000000000 <4> [2430.054430] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4> [2430.054442] CR2: 00007fc64e360f00 CR3: 00000001795e0001 CR4: 00000000003606e0 <4> [2430.054453] Call Trace: <4> [2430.054467] <IRQ> <4> [2430.054497] ? delayed_work_timer_fn+0x10/0x10 <4> [2430.054520] ? rcu_core+0x472/0x720 <4> [2430.054538] rcu_work_rcufn+0x1c/0x30 <4> [2430.054557] rcu_core+0x417/0x720 <4> [2430.054609] __do_softirq+0xd8/0x4b9 <4> [2430.054678] irq_exit+0xa9/0xc0 <4> [2430.054708] smp_apic_timer_interrupt+0x9c/0x250 <4> [2430.054732] apic_timer_interrupt+0xf/0x20 <4> [2430.054747] </IRQ> <4> [2430.054766] RIP: 0010:_raw_spin_unlock_irqrestore+0x4e/0x60 <4> [2430.054781] Code: c7 02 75 1f 53 9d e8 a1 d2 7e ff bf 01 00 00 00 e8 a7 4e 73 ff 65 8b 05 d8 cd 66 7e 85 c0 74 0c 5b 5d c3 e8 84 d0 7e ff 53 9d <eb> df e8 85 89 65 ff 5b 5d c3 0f 1f 84 00 00 00 00 00 53 48 8b 54 <4> [2430.054794] RSP: 0018:ffffc90000bafc88 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 <4> [2430.054810] RAX: ffff88815c170040 RBX: 0000000000000286 RCX: 0000000000000002 <4> [2430.054822] RDX: 00000000000017ac RSI: ffff88815c170908 RDI: ffffffff8212e9e1 <4> [2430.054834] RBP: ffff88817a000a40 R08: 00000000ec5ecc4c R09: 0000000000000000 <4> [2430.054846] R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00056db500 <4> [2430.054857] R13: 0000000000000001 R14: ffff88815b6d4000 R15: 0000000000000001 <4> [2430.054933] free_debug_processing+0x27d/0x380 <4> [2430.055260] ? intel_timeline_fini+0x46/0x1d0 [i915] <4> [2430.055301] __slab_free+0x337/0x4f0 <4> [2430.055325] ? _raw_spin_unlock_irqrestore+0x39/0x60 <4> [2430.055352] ? debug_check_no_obj_freed+0x132/0x210 <4> [2430.055386] ? mark_held_locks+0x49/0x70 <4> [2430.055726] ? intel_timeline_fini+0x46/0x1d0 [i915] <4> [2430.056025] ? mock_context_unpin+0x70/0x70 [i915] <4> [2430.056312] ? mock_context_unpin+0x70/0x70 [i915] <4> [2430.056602] intel_timeline_fini+0x46/0x1d0 [i915] <4> [2430.057006] mock_context_destroy+0x1e/0x80 [i915] <4> [2430.057405] __free_engines+0x41/0x60 [i915] <4> [2430.057817] i915_gem_context_free+0x52/0x1a0 [i915] <4> [2430.058106] contexts_free_worker+0x51/0xa0 [i915] <4> [2430.058136] process_one_work+0x245/0x610 <4> [2430.058184] worker_thread+0x37/0x380 <4> [2430.058214] ? process_one_work+0x610/0x610 <4> [2430.058232] kthread+0x119/0x130 <4> [2430.058253] ? kthread_park+0x80/0x80 <4> [2430.058282] ret_from_fork+0x3a/0x50 <4> [2430.058346] irq event stamp: 595193 <4> [2430.058366] hardirqs last enabled at (595192): [<ffffffff819a907c>] _raw_spin_unlock_irqrestore+0x4c/0x60 <4> [2430.058383] hardirqs last disabled at (595193): [<ffffffff810d11aa>] rcu_work_rcufn+0xa/0x30 <4> [2430.058402] softirqs last enabled at (594762): [<ffffffff81c0033a>] __do_softirq+0x33a/0x4b9 <4> [2430.058422] softirqs last disabled at (595167): [<ffffffff810b6499>] irq_exit+0xa9/0xc0 <4> [2430.058440] WARNING: CPU: 2 PID: 2615 at kernel/workqueue.c:1415 __queue_work+0x52f/0x670 <4> [2430.058452] ---[ end trace 3f2b93f60698f1a3 ]---
The CI Bug Log issue associated to this bug has been updated. ### New filters associated * SKL: igt@i915_selftest@mock_requests - dmesg-warn - WARNING: .* at kernel/workqueue.c:\d+ __queue_work - https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6410/shard-skl9/igt@i915_selftest@mock_requests.html - https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13527/shard-skl2/igt@i915_selftest@mock_requests.html - https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_13519/shard-skl1/igt@i915_selftest@mock_requests.html
commit 4fda44bf16b79a0b78fe36c6b9859e9ce2d09f43 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Jul 3 18:19:13 2019 +0100 drm/i915: Flush the workqueue before draining Trying to drain a workqueue while we may still be adding to it from background tasks is, according to kernel/workqueue.c, verboten. So, add a flush_workqueue() at the start of our cleanup procedure. References: https://bugs.freedesktop.org/show_bug.cgi?id=110550 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190703171913.16585-4-chris@chris-wilson.co.uk
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