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: Mon, 13 May 2024 13:32:31 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Linux regressions mailing list <regressions@...ts.linux.dev>
Cc: stable@...r.kernel.org, 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>,
	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 Wed, May 08, 2024 at 02:51:10PM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
> 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).

Now queued up, thanks.

greg k-h