https://bugzilla.kernel.org/show_bug.cgi?id=215315 Bug ID: 215315 Summary: [REGRESSION BISECTED] amdgpu crashes system suspend - NUC8i7HVKVA Product: Drivers Version: 2.5 Kernel Version: 5.15-rc1, 5.15, 5.16-rc4 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx Reporter: lenb@xxxxxxxxxx Regression: No My Intel NUC8i7HVKVA has an AMD GPU. Until 5.15-rc1, this machine was rock solid in suspend stress testing -- never crashing after hundreds of hours of back-to-back suspend cycles. Until this patch went upstream: commit f7d6779df642720e22bffd449e683bb8690bd3bf (refs/bisect/bad) Author: Guchun Chen <guchun.chen@xxxxxxx> Date: Fri Aug 27 18:31:41 2021 +0800 drm/amdgpu: stop scheduler when calling hw_fini (v2) This gurantees no more work on the ring can be submitted to hardware in suspend/resume case, otherwise a potential race will occur and the ring will get no chance to stay empty before suspend. v2: Call drm_sched_resubmit_job before drm_sched_start to restart jobs from the pending list. Suggested-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx> Suggested-by: Christian König <christian.koenig@xxxxxxx> Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx> Reviewed-by: Christian König <christian.koenig@xxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx I bisected that the patch before this one was integrated can handle over 1,000 back-to-back "freeze" system suspend cycles. Yet, when this patch is present, the system may crash before it completes only 100 cycles, and at most lasts a few hundred cycles. This crash is present in all following upstream rc's, including 5.15-rc4. When I revert this patch from 5.15-rc4, stability returns. Usually, the crash is manifest by a black screen, and a system that does not respond to ping, and will only respond to a long AC power button press to remove power; and a subsequent cold reboot. I have witnessed the crash occur, and the "ubuntu color themed" screen enters some sort of reverse video mode. In this weird color mode, I've seen a text window oscillate between scrolling and un-scrolling for a line -- sort of like it is going back in time, but then changes its mind. There is no response to keyboard, mouse, or network input. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
