6.16-rc5/regression/bisected - WARNING in drm_gem_object_handle_put_unlocked after commit 5307dce878d4

[Christian Heusel]

On 25/07/08 02:26PM, Mikhail Gavrilov wrote:
> Hi Thomas,

Hey Mike,

> After commit 5307dce878d4 ("drm/gem: Acquire references on GEM handles
> for framebuffers"), my kernel log becomes flooded with the following
> warning:
> WARNING: CPU: 5 PID: 1812 at drivers/gpu/drm/drm_gem.c:286
> drm_gem_object_handle_put_unlocked+0x207/0x330
> 
> This occurs during normal GNOME Shell usage, and the trace appears
> repeatedly. A full stack trace is included below.
> 
> I bisected the issue to this commit:
> 5307dce878d4 drm/gem: Acquire references on GEM handles for framebuffers

I think this is the same issue as the already fixed
https://gitlab.freedesktop.org/drm/amd/-/issues/4393

Also this is the fix linked in the issue:
https://lore.kernel.org/dri-devel/663110e1-3aa0-4f6f-8727-3a240bc96075@kernel.org/T/#me2a0f3254a57cdd157ba79344ab8d51476ba18e5

> Reverting this commit on top of current mainline kernel (6.16-rc5)
> fixes the issue — the warnings disappear completely.
> 
> My hardware config: https://linux-hardware.org/?probe=ce4c44c524
> 
> Kernel config, full bisect logs, and kernel logs from each bisect step
> are attached.
> Please take a look as soon as possible — this regression could affect
> any user relying on fbdev or shadow planes, and the commit is already
> CC'ed to stable at vger.kernel.org.
> It would be unfortunate if this made it into a stable release without
> being addressed.
> 
> Thanks in advance!
> 
> --
> Best Regards,
> Mike Gavrilov.

Cheers,
Chris
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