linux-kernel - Re: [BUG][v6.9-rc6] Deadlock with: Revert "drm/qxl: simplify qxl_fence

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Date: Thu, 2 May 2024 08:30:53 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Alex Constantino
 <dreaming.about.electric.sheep@...il.com>, Maxime Ripard
 <mripard@...nel.org>, Timo Lindfors <timo.lindfors@....fi>, Dave Airlie
 <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann
 <tzimmermann@...e.de>, Daniel Vetter <daniel@...ll.ch>
Subject: Re: [BUG][v6.9-rc6] Deadlock with: Revert "drm/qxl: simplify
 qxl_fence_wait"

On Thu, 2 May 2024 08:16:41 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> I went to run my tests on my VMs and the tests hung on boot up.
> Unfortunately, the most I ever got out was:
> 
> [   93.607888] Testing event system initcall: OK
> [   93.667730] Running tests on all trace events:
> [   93.669757] Testing all events: OK
> [   95.631064] ------------[ cut here ]------------
> Timed out after 60 seconds
> 
> I ran a bisect and it came up with:
> 
>  # first bad commit: [07ed11afb68d94eadd4ffc082b97c2331307c5ea] Revert "drm/qxl: simplify qxl_fence_wait"
> 
> I checked out 07ed11afb68d94eadd4ffc082b97c2331307c5ea~1 and it booted
> fine. Added back that commit, it failed to boot. I did this twice, and got
> the same results.
> 

Note, I reverted the above revert from v6.9-rc6 and that lets my VM boot to
completion again.

Attached is the config I used.

-- Steve

Download attachment "config" of type "application/octet-stream" (162777 bytes)