linux-kernel - Re: Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl graphics freezes frequently

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Date:   Wed, 25 Oct 2023 00:39:47 +0300 (EEST)
From:   Timo Lindfors <timo.lindfors@....fi>
To:     Salvatore Bonaccorso <carnil@...ian.org>
cc:     Timo Lindfors <timo.lindfors@....fi>, 1054514@...s.debian.org,
        Gerd Hoffmann <kraxel@...hat.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Dave Airlie <airlied@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        virtualization@...ts.linux-foundation.org,
        spice-devel@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: Bug#1054514: linux-image-6.1.0-13-amd64: Debian VM with qxl
 graphics freezes frequently

Hi,

On Tue, 24 Oct 2023, Salvatore Bonaccorso wrote:
> Thanks for the excelent constructed report! I think it's best to
> forward this directly to upstream including the people for the
> bisected commit to get some idea.

Thanks for the quick reply!

> Can you reproduce the issue with 6.5.8-1 in unstable as well?

Unfortunately yes:

ansible@...get:~$ uname -r
6.5.0-3-amd64
ansible@...get:~$ time sudo ./reproduce.bash
Wed 25 Oct 2023 12:27:00 AM EEST starting round 1
Wed 25 Oct 2023 12:27:24 AM EEST starting round 2
Wed 25 Oct 2023 12:27:48 AM EEST starting round 3
bug was reproduced after 3 tries

real    0m48.838s
user    0m1.115s
sys     0m45.530s

I also tested upstream tag v6.6-rc6:

...
+ detected_version=6.6.0-rc6
+ '[' 6.6.0-rc6 '!=' 6.6.0-rc6 ']'
+ exec ssh target sudo ./reproduce.bash
Wed 25 Oct 2023 12:37:16 AM EEST starting round 1
Wed 25 Oct 2023 12:37:42 AM EEST starting round 2
Wed 25 Oct 2023 12:38:10 AM EEST starting round 3
Wed 25 Oct 2023 12:38:36 AM EEST starting round 4
Wed 25 Oct 2023 12:39:01 AM EEST starting round 5
Wed 25 Oct 2023 12:39:27 AM EEST starting round 6
bug was reproduced after 6 tries


For completeness, here is also the grub_set_default_version.bash script 
that I had to write to automate this (maybe these could be in debian 
wiki?):

#!/bin/bash
set -x

version="$1"

idx=$(expr $(grep "menuentry " /boot/grub/grub.cfg | sed 1d |grep -n "'Debian GNU/Linux, with Linux $version'"|cut -d: -f1) - 1)
exec sudo grub-set-default "1>$idx"



-Timo