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Last commit made on 2020-07-21
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5a88ca3... by Chris Wilson on 2020-07-20

HAX sched/core: Paper over the ttwu() race

On all Core platforms we see

<4> [181.766629] WARNING: CPU: 0 PID: 1524 at kernel/sched/core.c:2388 ttwu_queue_wakelist+0xbc/0xd0
<4> [181.766637] Modules linked in: i915(+) vgem snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio amdgpu mei_hdcp x86_pkg_temp_thermal coretemp crct10dif_pclmul crc32_pclmul btusb btrtl btbcm btintel bluetooth snd_hda_codec_hdmi ghash_clmulni_intel e1000e ecdh_generic snd_intel_dspcfg ecc igb snd_hda_codec ptp pps_core snd_hwdep snd_hda_core snd_pcm mei_me gpu_sched ttm mei intel_lpss_pci prime_numbers pinctrl_sunrisepoint pinctrl_intel [last unloaded: i915]
<4> [181.766685] CPU: 0 PID: 1524 Comm: igt/4 Tainted: G U 5.8.0-rc4-gb182a04c513e3-drmtip_541+ #1
<4> [181.766694] Hardware name: Intel Corporation NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0047.2018.0718.1706 07/18/2018
<4> [181.766705] RIP: 0010:ttwu_queue_wakelist+0xbc/0xd0
<4> [181.766710] Code: 00 00 00 5b 5d 41 5c 41 5d c3 31 c0 5b 5d 41 5c 41 5d c3 31 c0 f6 c3 08 74 f2 48 c7 c2 00 ad 03 00 83 7c 11 40 01 77 e4 eb 80 <0f> 0b 31 c0 eb dc 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 bf 17
<4> [181.766726] RSP: 0018:ffffc90000003e08 EFLAGS: 00010046
<4> [181.766733] RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffff888276a00000
<4> [181.766740] RDX: 000000000003ad00 RSI: ffffffff8232045b RDI: ffffffff8233103e
<4> [181.766747] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
<4> [181.766754] R10: 00000000d3fa25c3 R11: 0000000053712267 R12: ffff88825b912940
<4> [181.766761] R13: 0000000000000000 R14: 0000000000000087 R15: 000000000003ad00
<4> [181.766769] FS: 0000000000000000(0000) GS:ffff888276a00000(0000) knlGS:0000000000000000
<4> [181.766777] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4> [181.766783] CR2: 000055b8245814e0 CR3: 0000000005610003 CR4: 00000000003606f0
<4> [181.766790] Call Trace:
<4> [181.766794] <IRQ>
<4> [181.766798] try_to_wake_up+0x21b/0x690
<4> [181.766805] autoremove_wake_function+0xc/0x50
<4> [181.766858] __i915_sw_fence_complete+0x1ee/0x250 [i915]
<4> [181.766912] dma_i915_sw_fence_wake+0x2d/0x40 [i915]
<4> [181.766962] signal_irq_work+0x38b/0x530 [i915]
<4> [181.766971] irq_work_single+0x44/0x80
<4> [181.766977] irq_work_run_list+0x28/0x40
<4> [181.766982] irq_work_run+0x26/0x40
<4> [181.766988] __sysvec_irq_work+0x3f/0x1d0
<4> [181.766993] asm_call_on_stack+0x12/0x20
<4> [181.766997] </IRQ>
<4> [181.767000] sysvec_irq_work+0xdd/0x100
<4> [181.767005] asm_sysvec_irq_work+0x12/0x20
<4> [181.767009] RIP: 0010:_raw_spin_unlock_irqrestore+0x49/0x60

about 90% of the time.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2110
References: b6e13e85829f ("sched/core: Fix ttwu() race")
Signed-off-by: Chris Wilson <email address hidden>
Link: https://patchwork<email address hidden>

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