Re: [Nouveau] Advice about debugging nouveau driver suspend issue (init_on_alloc=1 and init_on_free=1)

[Ilia Mirkin <imirkin@alum.mit.edu>]

The most straightforward thing, if you can reproduce at will, would be
to do a bisect to figure out which change this happened with. Once we
know which change caused the problem, it will hopefully provide with
more ability to sort out where we're going wrong. You can also play
with things like KASAN, although it's not clear to me that they would
necessarily catch this problem.

Cheers,

  -ilia

On Wed, Oct 13, 2021 at 1:31 PM Computer Enthusiastic
<computer.enthusiastic@gmail.com> wrote:
>
> Hello,
>
> Greeting to all list members.
>
> I hope this mailing list is the right place to ask about it, otherwise
> I apologize in advance and, please, direct me to the right mailing
> list.
>
> I would like to receive advice on how to debug (or help to debug) the
> noveau kernel module suspend issue reported in [1][2][3]. The issue is
> constantly reproducible and it consists in a  screen corruption with
> system lockup on resume after suspend to ram or suspend to disk. It
> seems to affect NV50 nvidia graphic cards at least from kernel 5.10.0
> (probably from 5.2 or 5.3) up to 5.14.10 (I have not tested 5.15 in rc
> state, actually).
>
> Thanks in advance.
>
> [1] https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/-/issues/547
> [2] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989705
> [3] https://bugzilla.kernel.org/show_bug.cgi?id=213617