| Summary: | Crash when starting multiple drags | ||
|---|---|---|---|
| Product: | [Plasma] kwin | Reporter: | Pilzschaf <pilzschaf> |
| Component: | wayland-generic | Assignee: | KWin default assignee <kwin-bugs-null> |
| Status: | RESOLVED BACKTRACE | ||
| Severity: | crash | CC: | kde |
| Priority: | NOR | ||
| Version First Reported In: | 5.27.9 | ||
| Target Milestone: | --- | ||
| Platform: | Manjaro | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
Unfortunately the crash dump seems to be too large to add as an attachment |
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