Bug 102423

Summary:	kwin segfaults when Alt+Tabbing with windows thumbnails on AMDGPU
Product:	Mesa	Reporter:	leguen.yannick
Component:	Drivers/Gallium/radeonsi	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED NOTOURBUG	QA Contact:	Default DRI bug account <dri-devel>
Severity:	normal
Priority:	medium	CC:	henry.hu.sh
Version:	17.1
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Backtrace of the kwin crash backtrace kwin alt-tab thumbnails AMDGPU

Description leguen.yannick 2017-08-26 09:31:55 UTC

Created attachment 133806 [details]
Backtrace of the kwin crash

I use an AMD RX560 with Mesa 17.1.7 and Plasma 5.10.5 (ArchLinux).

When I use the "thumbnails" Alt+Tab style for kwin, sooner or later kwin will segfault while alt+tabbing.
Without windows thumbnails, everything works ok.

I reported this bug on the KDE bugtracker already : https://bugs.kde.org/show_bug.cgi?id=383058

But the crash seems to come from the driver.
It happened with previous Mesa 17.1 versions too.

See the backtrace in attachment.

Comment 1 Michel Dänzer 2017-08-28 01:54:35 UTC

Nothing can be done about this without debugging symbols being available for /usr/lib/xorg/modules/dri/radeonsi_dri.so in the backtrace.

Comment 2 leguen.yannick 2017-08-28 09:06:48 UTC

How can I provide such debugging symbols?

Comment 3 Henry Hu 2017-11-09 18:20:42 UTC

I also reported a similar bug to KDE:
https://bugs.kde.org/show_bug.cgi?id=384901
and they sent me upstream.

The backtrace is very similar. On the other hand, I am using the r600 dri module.
It crashes every time I do alt+tab. I'll try to build with debug.

Comment 4 pmargeti34 2018-02-01 10:15:30 UTC

Created attachment 137109 [details]
backtrace kwin alt-tab thumbnails AMDGPU

Kwin segfaults when alt-tabbing with "thumbnails" selected. I wanted to file a bug report against AMDGPU driver, but search shows exactly the same problem with radeonsi, so I'm adding to this bug report. If you think I should open a new bug against AMDGPU, let me know please.

AMD Rx560 using AMDGPU with DC=1 on linux 4.15.0
Xorg: 1.19.6+13+gd0d1a694f-1
xf86-video-amdgpu: 1.4.0-1
kwin: 5.11.95-1
mesa: 17.3.3-2

Filed a bug with KDE: https://bugs.kde.org/show_bug.cgi?id=389593
They told me it's a driver crash and sent me here.

Comment 5 Alex Deucher 2018-02-01 13:49:51 UTC

amdgpu is the kernel driver and radeonsi is the user mode mesa driver.  They both work together on your system.

Comment 6 pmargeti34 2018-02-06 18:56:57 UTC

Plasma updated to 5.12 today, and I no longer can reproduce this bug. I guess this was on their end afterall.

Comment 7 Timothy Arceri 2018-09-08 06:50:46 UTC

Closing as per comment 6.

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