Re: Warnings and errors in drm_mode_config_cleanup when booting 6.19.10 and 7.0-rc5

[Matt Fagnani <matt.fagnani@bell.net>]

On 2026-04-02 08:12, Greg KH wrote:
> On Sat, Mar 28, 2026 at 11:52:48AM +0100, Thorsten Leemhuis wrote:
>> Matt, thx for the report.
>>
>> On 3/28/26 11:30, Matt Fagnani wrote:
>>> I could try to bisect. The commit
>>> e493c135980f90c20308d1a98f2e0d1223951e94 drm: Fix use-after-free on
>>> framebuffers and property blobs when calling drm_dev_unplug was included
>>> in 6.19.10 and changed drm_mode_config_cleanup https://git.kernel.org/
>>> pub/scm/linux/kernel/git/stable/linux.git/commit/?
>>> h=linux-6.19.y&id=e493c135980f90c20308d1a98f2e0d1223951e94
>> Did a quick search. Turns out this is mainline commit 6bee098b914176
>> ("drm: Fix use-after-free on framebuffers and property blobs when
>> calling drm_dev_unplug") -- and when searching for that (FWIW, this is
>> not widely known, but that is really helpful in case like this, as the
>> mainline commit id is way more relevant) is turns out that is in the
>> process of getting reverted:
>>
>> See https://lore.kernel.org/all/20260326082217.39941-2-dev@lankhorst.se/
>> or 45ebe43ea00d6b ("Revert "drm: Fix use-after-free on framebuffers and
>> property blobs when calling drm_dev_unplug"") [next-20260327
>> (pending-fixes)].
>>
>> Sasha and Greg: you might want to make sure to pick this up.
> When it shows up in a Linus-released kernel, can someone remind us?
>
> thanks,
>
> greg k-h

7.0-rc7 https://lwn.net/Articles/1066405/ had the patch Revert "drm: Fix 
use-after-free on framebuffers and property blobs when calling 
drm_dev_unplug" 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v7.0-rc7&id=45ebe43ea00d6b9f5b3e0db9c35b8ca2a96b7e70 Thanks.

Matt