Bug 453214

Summary:	kwin_wayland SIGSEGV when switching monitor input with a KVM
Product:	[Plasma] kwin	Reporter:	Johan Sköld <johan>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	crash	CC:	nate
Priority:	NOR
Version:	5.24.4
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed In:
Attachments:	Backtrace produced by GDB

Description Johan Sköld 2022-04-30 00:07:38 UTC

Created attachment 148466 [details]
Backtrace produced by GDB

SUMMARY
I have my computer connected to a KVM through DisplayPort. When I switch input away from it and then back again, kwin_wayland segfaults after a very brief moment of showing my desktop (milliseconds rather than seconds).

I'm attaching a backtrace as produced using the commands at https://community.kde.org/KWin/Debugging#TL.3BDR_for_bug_reporters

STEPS TO REPRODUCE
1. Using a KVM switch input away from the machine running KDE
2. Using the same KVM switch, switch input back to the machine running KDE

OBSERVED RESULT
kwin_wayland segfaults, taking the entire desktop and everything that was running in it down with it before restarting.

EXPECTED RESULT
kwin_wayland does not crash.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.17.4-300.fc36.x86_64
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.91.0
Qt Version: 5.13.3

Comment 1 Johan Sköld 2022-04-30 03:19:51 UTC

After some testing it appears this may be triggered by bismuth resizing/moving windows when switching the display back. kwin_wayland no longer crashes after removing bismuth.

Comment 2 Nate Graham 2022-05-03 14:41:08 UTC


*** This bug has been marked as a duplicate of bug 448102 ***