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Bug#1106743: amdgpu: random brief system hangs with drm DMCUB error

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Hello,

On Wed, May 28, 2025 at 06:03:15PM -0700, Forest wrote:
> Package: src:linux
> Version: 6.12.29-1
> Severity: important
> X-Debbugs-Cc: forestix@nom.one
> 
> Dear Maintainer,
> 
> Since upgrading from kernel 6.12.27 to 6.12.29, my system occasionally
> hangs (evidenced by the mouse pointer freezing in place) for roughly
> 0.3 - 2 seconds at a time.
> 
> These hangs are accompanied by the following line in dmesg, often
> repeated several times:
> 
> amdgpu 0000:03:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
> 
> I believe this upstream report is the problem I am experiencing:
> 
> https://gitlab.freedesktop.org/drm/amd/-/issues/4238
> 
> The problem vanishes when I use a custom build of kernel 6.12.29 with
> commit ID 468034a06a6e8043c5b50f9cd0cac730a6e497b5 reverted. Upstream
> commit ID: f1c6be3999d2be2673a51a9be0caf9348e254e52
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=468034a06a6e8043c5b50f9cd0cac730a6e497b5


Note there is some confusion about the affected commits because the
offending change is in Linus Torvalds tree twice. Once as f1c6be3999d2
in v6.15-rc6 (with Cc: stable) and once as cfb2d41831ee to be included
in v6.16-rc1 (without Cc: stable).

Upstream reverted cfb2d41831ee in commit
1b824eef269db44d068bbc0de74c94a8e8f9ce02, which currently waits in next
to go into v6.16. It's marked for stable.

f1c6be3999d2 got backported to
	6.14.7  4ec308a4104bc71a431c75cc9babf49303645617
	6.12.29 468034a06a6e8043c5b50f9cd0cac730a6e497b5
	6.6.91  c8a91debb020298c74bba0b9b6ed720fa98dc4a9

So this might need some proding to get the backports all done correctly
if the stable maintainers don't notice that f1c6be3999d2 ==
cfb2d41831ee.

Best regards
Uwe

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Bug#1106743: amdgpu: random brief system hangs with drm DMCUB error Uwe Kleine-König <u.kleine-koenig@baylibre.com> - 2025-06-04 11:10 +0200

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