[Bug 215315] New: [REGRESSION BISECTED] amdgpu crashes system suspend - NUC8i7HVKVA

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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@kernel-bugs.osdl.org
          Reporter: lenb@kernel.org
        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@amd.com>
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@amd.com>
    Suggested-by: Christian König <christian.koenig@amd.com>
    Signed-off-by: Guchun Chen <guchun.chen@amd.com>
    Reviewed-by: Christian König <christian.koenig@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org

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.

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