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.
Nothing can be done about this without debugging symbols being available for /usr/lib/xorg/modules/dri/radeonsi_dri.so in the backtrace.
How can I provide such debugging symbols?
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.
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.
amdgpu is the kernel driver and radeonsi is the user mode mesa driver. They both work together on your system.
Plasma updated to 5.12 today, and I no longer can reproduce this bug. I guess this was on their end afterall.
Closing as per comment 6.
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