linux-kernel - Re: [git pull] drm for 6.8

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Date: Wed, 24 Jan 2024 17:24:28 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Donald Carr <sirspudd@...il.com>,
 Mario Limonciello <mario.limonciello@....com>
Cc: Dave Airlie <airlied@...il.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Daniel Vetter <daniel.vetter@...ll.ch>,
 dri-devel <dri-devel@...ts.freedesktop.org>,
 LKML <linux-kernel@...r.kernel.org>,
 Linux regressions mailing list <regressions@...ts.linux.dev>,
 Thorsten Leemhuis <regressions@...mhuis.info>,
 Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Subject: Re: [git pull] drm for 6.8

On 1/24/24 16:31, Donald Carr wrote:
> On Wed, Jan 24, 2024 at 7:06 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>> When testing the rc1 on my openSUSE Tumbleweed desktop, I've started
>> experiencing "frozen desktop" (KDE/Wayland) issues. The symptoms are that
>> everything freezes including mouse cursor. After a while it either resolves,
>> or e.g. firefox crashes (if it was actively used when it froze) or it's
>> frozen for too long and I reboot with alt-sysrq-b. When it's frozen I can
>> still ssh to the machine, and there's nothing happening in dmesg.
>> The machine is based on Amd Ryzen 7 2700 and Radeon RX7600.
>>
>> I've bisected the merge commits so far and now will try to dig into this
>> one. I've noticed there was also a drm fixes PR later in the merge window but
>> since it was also merged into rc1 and thus didn't prevent the issue for me,
>> I guess it's not relevant here?
>>
>> Because the reproduction wasn't very deterministic I considered a commit bad
>> even if it didn't lead to completely frozen desktop and a forced reboot.
>> Even the multi-second hangs that resolved were a regression compared to 6.7
>> anyway.
>>
>> If there are known issues and perhaps candidate fixes already, please do tell.
> 
> I am experiencing the exact same symptoms; sddm (on weston) starts
> perfectly, launching a KDE wayland session freezes at various points
> (leading to plenty of premature celebration), but normally on the
> handoff from sddm to kde (replete with terminal cursor on screen)
> 
> Working perfectly as of the end of 6.7 final release, broken as of 6.8 rc1.
> Sometimes sddm can be successfully restarted via ssh, other times
> restarting sddm is slow and fails to complete.

Big thanks to Thorsten who suggested I look at the following:

https://lore.kernel.org/all/20240123021155.2775-1-mario.limonciello@amd.com/

https://lore.kernel.org/all/CABXGCsM2VLs489CH-vF-1539-s3in37=bwuOWtoeeE+q26zE+Q@mail.gmail.com/

Instead of further bisection I've applied Mario's revert from the first link
on top of 6.8-rc1 and the issue seems gone for me now.

Vlastimil

> Yours sincerely,
> Donald