Bug 431795

Application: kwin_x11 (5.19.5)

Qt Version: 5.14.2
Frameworks Version: 5.74.0
Operating System: Linux 5.8.0-38-lowlatency x86_64
Windowing system: X11
Distribution: Ubuntu 20.10

-- Information about the crash:
- What I was doing when the application crashed:
Activated hot corner (located in the lower left corner by default on Ubuntu Studio 20.10).

Note:
Supposedly this bug was fixed in 5.18.6, but I'm running 5.19.5 and I'm still experiencing the issue.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f392ee104ee in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /lib/x86_64-linux-gnu/libkwin.so.5
#5  0x00007f392da884ef in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) (this=<optimized out>, eventType=..., message=message@entry=0x7f392002e780, result=result@entry=0x7fff47b1a3e8) at kernel/qabstracteventdispatcher.cpp:488
#6  0x00007f39277db505 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) (this=this@entry=0x5561c013a7d0, event=event@entry=0x7f392002e780) at qxcbnativeinterface.h:101
#7  0x00007f39277dca46 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x5561c013a7d0, flags=...) at qxcbconnection.cpp:1029
#8  0x00007f39277ff740 in QXcbUnixEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x5561c0197020, flags=...) at qxcbeventdispatcher.cpp:61
#9  0x00007f392da89a4b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7fff47b1a530, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#10 0x00007f392da91fc6 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#11 0x00005561bf01ca6d in  ()
#12 0x00007f392d411cb2 in __libc_start_main (main=0x5561bf01c6a0, argc=1, argv=0x7fff47b1a7b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff47b1a7a8) at ../csu/libc-start.c:314
#13 0x00005561bf01cf8e in _start ()
[Inferior 1 (process 2246) detached]

The reporter indicates this bug may be a duplicate of or related to bug 423319.

Possible duplicates by query: bug 431564, bug 430945, bug 430328, bug 430197, bug 430180.

Reported using DrKonqi