https://bugs.kde.org/show_bug.cgi?id=422327
Bug ID: 422327
Summary: KWin sometimes crashes when leaving "present windows"
Product: kwin
Version: 5.18.90
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-present-windows
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@hexchain.org
Target Milestone: ---
KWin sometimes crashes when leaving the "Present windows" screen.
Occasionally, the crash can be triggered by:
1. setting the top left corner as a hot corner for "present windows"
2. move the mouse cursor to the top left corner (which should trigger "present
windows" now) and click multiple times without moving the cursor
Support information: https://paste.xinu.at/nwQ7Y/
I've tried to build kwin with the following flags:
export CFLAGS="-Og -ggdb3 -fvar-tracking-assignments"
export CXXFLAGS="-Og -ggdb3 -fvar-tracking-assignments"
but the stack trace still does not seem very useful:
(gdb) bt
#0 0x00007f901745d355 in raise () at /usr/lib/libc.so.6
#1 0x00007f9018d03290 in KCrash::defaultCrashHandler(int) () at
/usr/lib/libKF5Crash.so.5
#2 0x00007f901745d3e0 in <signal handler called> () at /usr/lib/libc.so.6
#3 0x000055f03fbfae00 in ()
#4 0x00007f9018e833ff in KWin::Workspace::workspaceEvent(xcb_generic_event_t*)
(this=0x55f03ee683f0, e=e@entry=0x7f900c0133f0) at
/usr/include/c++/10.1.0/bits/atomic_base.h:325
#5 0x00007f9018ebd845 in KWin::XcbEventFilter::nativeEventFilter(QByteArray
const&, void*, long*) (this=<optimized out>, eventType=...,
message=0x7f900c0133f0, result=<optimized out>)
at /build/kwin/src/kwin-5.18.90/workspace.h:76
#6 0x00007f9017aa0b47 in
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) ()
at /usr/lib/libQt5Core.so.5
#7 0x00007f9011703703 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() at /usr/lib/libQt5XcbQpa.so.5
#8 0x00007f9011704c79 in
QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5XcbQpa.so.5
#9 0x00007f901172806e in () at /usr/lib/libQt5XcbQpa.so.5
#10 0x00007f9017aa201c in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/usr/lib/libQt5Core.so.5
#11 0x00007f9017aaa4a4 in QCoreApplication::exec() () at
/usr/lib/libQt5Core.so.5
#12 0x000055f03dba20ef in main(int, char**) (argc=<optimized out>,
argv=0x7fffd2026968) at /build/kwin/src/kwin-5.18.90/main_x11.cpp:479
Operating System: Arch Linux
KDE Plasma Version: 5.18.90
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0
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