https://bugs.kde.org/show_bug.cgi?id=477778
Bug ID: 477778
Summary: Crash when starting multiple drags
Classification: Plasma
Product: kwin
Version: 5.27.9
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: pilzsc...@t-online.de
Target Milestone: ---
SUMMARY
I had a bug in my application which lead it to create multiple drags eg. it
called wl_data_device.start_drag twice. It used two independent wl_data_source
objects. The application continued as normal but kwin crashed on me after some
time. I could get it to crash reliably when opening thunderbird after doing the
drag.
STEPS TO REPRODUCE
1. Initiate multiple simultaneous drags with wl_data_device.start_drag
2. Finish drags by dropping them somewhere
3. Close application
4. Use system normally. Usually when opening applications (for example
thunderbird) it crashed
OBSERVED RESULT
Crash
EXPECTED RESULT
I am not sure whether multiple simultaneous drags are officially supported by
wayland. Nonetheless I expect KWin to handle that case somewhat gracefully.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.112.0
Qt Version: 5.15.11
ADDITIONAL INFORMATION
I appended a crash dump to this report.
Problem seems to be the following line.
if (drag->handleClientMessage(event)) {
Probably m_oldDrags contains an invalid element which has not been cleaned up
correctly
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