[REGRESSION] QXL display malfunction

[Linux regression tracking (Thorsten Leemhuis)]

[CCing a few more people and lists that get_maintainers pointed out for qxl]

Hi, Thorsten here, the Linux kernel's regression tracker. Top-posting
for once, to make this easily accessible to everyone.

Thomas, from here it looks like this report that apparently is caused by
a change of yours that went into 6.10-rc1 (b33651a5c98dbd ("drm/qxl: Do
not pin buffer objects for vmap")) fell through the cracks. Or was
progress made to resolve this and I just missed this?

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

#regzbot poke


On 03.06.24 04:29, Kaplan, David wrote:
>> -----Original Message-----
>> From: Kaplan, David
>> Sent: Sunday, June 2, 2024 9:25 PM
>> To: tzimmermann at suse.de; dmitry.osipenko at collabora.com; Koenig,
>> Christian <Christian.Koenig at amd.com>; zach.rusin at broadcom.com
>> Cc: Petkov, Borislav <Borislav.Petkov at amd.com>; regressions at list.linux.dev
>> Subject: [REGRESSION] QXL display malfunction
>>
>> Hi,
>>
>> I am running an Ubuntu 19.10 VM with a tip kernel using QXL video and I've
>> observed the VM graphics often malfunction after boot, sometimes failing to
>> load the Ubuntu desktop or even immediately shutting the guest down.
>> When it does load, the guest dmesg log often contains errors like
>>
>> [    4.303586] [drm:drm_atomic_helper_commit_planes] *ERROR* head 1
>> wrong: 65376256x16777216+0+0
>> [    4.586883] [drm:drm_atomic_helper_commit_planes] *ERROR* head 1
>> wrong: 65376256x16777216+0+0
>> [    4.904036] [drm:drm_atomic_helper_commit_planes] *ERROR* head 1
>> wrong: 65335296x16777216+0+0
>> [    5.374347] [drm:qxl_release_from_id_locked] *ERROR* failed to find id in
>> release_idr
>>
>> I bisected the issue down to "drm/qxl: Do not pin buffer objects for vmap"
>> (b33651a5c98dbd5a919219d8c129d0674ef74299).
>>
>> The full guest .config and guest XML can be provided if desired.  The guest
>> kernel has QXL support compiled in and the VM has
>>
>> <video>
>>   <model type="qxl" ram="65536" vram="65536" vgamem="16384"
>> heads="1" primary="yes"/>
>>   <address type="pci" domain="0x0000" bus="0x00" slot="0x01"
>> function="0x0"/> </video>
>>
>> The host is Ubuntu 24.04 (stock) running QEMU version 8.2.2.  The VM is run
>> under virt-manager 4.1.0.  If other information would be helpful, just let me
>> know.
>>
>> Thanks --David Kaplan
> 
> Fixing emails...sorry
> 
> --David Kaplan
> 
>