Bug#1122106: linux-image-amd64: UBSAN create a systematic trace in DRM driver

[Salvatore Bonaccorso <carnil@debian.org>]

Hi,

On Thu, Dec 11, 2025 at 10:24:42AM +0100, Eric Valette wrote:
> On 12/10/25 20:45, Salvatore Bonaccorso wrote:
> > Control: tags -1 + moreinfo
> > 
> > Hi,
> 
> Hi. Thanks for taking time looking at this (cosmetic if really false
> positive) bug.
> 
> > There is an upstream report which seems to match:
> > https://gitlab.freedesktop.org/drm/amd/-/issues/4374
> 
> Yes this look the same. The good point is that it seems to be a false
> positive and browsing internet it appeared already on much older kernels...
> 
> > 
> > Alex Deucher proposed there two changes, can you test those please and
> > report back if they work? If so can you please directly confirm in the
> > upstream issue which fixes it and report back here as well?
> 
> 
> Well. Compiling a debian kernel on this machine will requires several hours.
> Will eventually do. I will report if I do.

FWIW, if you come to it, the following should help to just make a
build with a patch on top:

https://kernel-team.pages.debian.net/kernel-handbook/ch-common-tasks.html#id-1.6.6.4

Regards,
Salvatore