Re: NV04, 6.18.8 crashes on NULL pointer dereference

["Danilo Krummrich" <dakr@kernel.org>]

On Tue Feb 3, 2026 at 3:38 PM CET, Greg KH wrote:
> On Sun, Feb 01, 2026 at 11:14:51PM +0100, Bruno Prémont wrote:
>> Bisect completed.
>> 
>> The offending patch is:
>> commit 448a2071a843831fe5fa71545cbfa7e15ee8966d (HEAD)
>> Author: Lyude Paul <lyude@redhat.com>
>> Date:   Wed Jan 21 14:13:10 2026 -0500
>> 
>>     drm/nouveau/disp: Set drm_mode_config_funcs.atomic_(check|commit)
>>     
>>     commit 604826acb3f53c6648a7ee99a3914ead680ab7fb upstream.
>>     
>>     Apparently we never actually filled these in, despite the fact that we do
>>     in fact technically support atomic modesetting.
>>     
>>     Since not having these filled in causes us to potentially forget to disable
>>     fbdev and friends during suspend/resume, let's fix it.
>>     
>>     Signed-off-by: Lyude Paul <lyude@redhat.com>
>>     Cc: stable@vger.kernel.org
>>     Reviewed-by: Dave Airlie <airlied@redhat.com>
>>     Link: https://patch.msgid.link/20260121191320.210342-1-lyude@redhat.com
>>     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> 
>>  drivers/gpu/drm/nouveau/nouveau_display.c | 2 ++
>>  1 file changed, 2 insertions(+)
>> 
>> 
>> It landed in 6.18.8. Seems like not all chip generations are ready for
>> atomic modesetting.
>
> Is this also a problem in 6.19-rc?

I did not test it, but a different mail [1] suggests that John did reproduce
this in 6.19-rc7 too.

I've already picked up a revert [2], which should be in linux-next and should
soon be in Linus' tree as well.

[1] https://lore.kernel.org/all/87h5s34d36.fsf@jogness.linutronix.de/
[2] https://patch.msgid.link/20260130113230.2311221-1-john.ogness@linutronix.de