linux-kernel - Re: [Regression] 6.9.0: WARNING: workqueue: WQ_MEM_RECLAIM ttm:ttm_bo_delayed_delete [ttm] is flushing !WQ_MEM_RECLAIM events:qxl_gc

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Date: Wed, 8 May 2024 14:51:10 +0200
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: stable@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>
Cc: airlied@...il.com, airlied@...hat.com, daniel@...ll.ch,
 dreaming.about.electric.sheep@...il.com, dri-devel@...ts.freedesktop.org,
 kraxel@...hat.com, linux-kernel@...r.kernel.org,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
 spice-devel@...ts.freedesktop.org, tzimmermann@...e.de,
 virtualization@...ts.linux.dev, Anders Blomdell <anders.blomdell@...il.com>,
 Linux regressions mailing list <regressions@...ts.linux.dev>,
 David Wang <00107082@....com>
Subject: Re: [Regression] 6.9.0: WARNING: workqueue: WQ_MEM_RECLAIM
 ttm:ttm_bo_delayed_delete [ttm] is flushing !WQ_MEM_RECLAIM
 events:qxl_gc_work [qxl]

On 08.05.24 14:35, Anders Blomdell wrote:
> On 2024-05-07 07:04, Linux regression tracking (Thorsten Leemhuis) wrote:
>> On 06.05.24 16:30, David Wang wrote:
>>>> On 30.04.24 08:13, David Wang wrote:
>>
>>>> And confirmed that the warning is caused by
>>>> 07ed11afb68d94eadd4ffc082b97c2331307c5ea and reverting it can fix.
>>>
>>> The kernel warning still shows up in 6.9.0-rc7.
>>> (I think 4 high load processes on a 2-Core VM could easily trigger
>>> the kernel warning.)
>>
>> Thx for the report. Linus just reverted the commit 07ed11afb68 you
>> mentioned in your initial mail (I put that quote in again, see above):
>>
>> 3628e0383dd349 ("Reapply "drm/qxl: simplify qxl_fence_wait"")
>> https://git.kernel.org/torvalds/c/3628e0383dd349f02f882e612ab6184e4bb3dc10
>>
>> So this hopefully should be history now.
>>
> Since this affects the 6.8 series (6.8.7 and onwards), I made a CC to
> stable@...r.kernel.org

Ohh, good idea, I thought Linus had added a stable tag, but that is not
the case. Adding Greg as well and making things explicit:

@Greg: you might want to add 3628e0383dd349 ("Reapply "drm/qxl: simplify
qxl_fence_wait"") to all branches that received 07ed11afb68d94 ("Revert
"drm/qxl: simplify qxl_fence_wait"") (which afaics went into v6.8.7,
v6.6.28, v6.1.87, and v5.15.156).

Ciao, Thorsten