https://bugs.kde.org/show_bug.cgi?id=430945
Bug ID: 430945
Summary: kwin crashes due to 'present windows' hotcorners
Product: kwin
Version: 5.19.5
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: effects-present-windows
Assignee: kwin-bugs-n...@kde.org
Reporter: r.da...@gmail.com
Target Milestone: ---
SUMMARY
When using a 'hotcorner' to initiate 'present windows', windows present
correctly but then using the hotcorner again to exit 'present windows', kwin
often crashes.
Note that triggering 'present windows' with keyboard shortcut does NOT result
in a crash.
STEPS TO REPRODUCE
1. Configure top-right hotcorner as 'present windows'
2. Repeatedly hit top-right corner of screen
3. Observe entering and exiting of 'present windows'
OBSERVED RESULT
After a few tries, kwin will crash with SIGSEGV.
EXPECTED RESULT
System should enter and exit 'present windows' repeatedly without issue.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 20.10
(available in About System)
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2
Kernel: 5.8.0-33-generic
ADDITIONAL INFORMATION
Cannot be sure but the issue _seems_ easier to reproduce when windows have no
title bars (disabled with 'Hide Window Borders' keyboard shortcut
(shift-alt-f9)).
Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
[KCrash Handler]
#4 0x00007f24986794ee in KWin::Workspace::workspaceEvent(xcb_generic_event_t*)
() at /lib/x86_64-linux-gnu/libkwin.so.5
#5 0x00007f24972f14ef in
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) ()
at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6 0x00007f2491033505 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#7 0x00007f2491034a46 in
QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#8 0x00007f2491057740 in () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#9 0x00007f24972f2a4b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f24972fafc6 in QCoreApplication::exec() () at
/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x000055a3320caa6d in ()
#12 0x00007f2496c7acb2 in __libc_start_main (main=0x55a3320ca6a0, argc=3,
argv=0x7fff24a130e8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fff24a130d8) at ../csu/libc-start.c:314
#13 0x000055a3320caf8e in _start ()
[Inferior 1 (process 27214) detached]
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