Application: kwin_x11 (5.17.90)

Qt Version: 5.14.0
Frameworks Version: 5.66.0
Operating System: Linux 5.4.12-arch1-1 x86_64
Windowing system: X11
Distribution: "Arch Linux"

-- Information about the crash:
- What I was doing when the application crashed:
I moved the mouse toward the screen corner to activate the desktop grid effect. However, kwin does not crash if I do it again. I had an external monitor connected to my laptop at the time.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe480384840 (LWP 1320))]

Thread 15 (Thread 0x7fe3a485a700 (LWP 14683)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe486968cc4 in QWaitConditionPrivate::wait(QDeadlineTimer) (deadline=..., this=0x5597fa19ec40) at thread/qwaitcondition_unix.cpp:158
#2  0x00007fe486968cc4 in QWaitCondition::wait(QMutex*, QDeadlineTimer) (this=<optimized out>, mutex=0x5597fa8511b0, deadline=...) at thread/qwaitcondition_unix.cpp:225
#3  0x00007fe486968da2 in QWaitCondition::wait(QReadWriteLock*, QDeadlineTimer) (this=0x5597fa19ec90, readWriteLock=0x80, deadline=...) at thread/qwaitcondition_unix.cpp:240
#4  0x0000000000000000 in  ()

Thread 14 (Thread 0x7fe3cbfff700 (LWP 14682)):
#0  0x00007fe4881f4ae6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fe486b91cc3 in normalizedTimespec(timespec&) (t=<synthetic pointer>...) at kernel/qcore_unix_p.h:116
#2  0x00007fe486b91cc3 in operator-(timespec const&, timespec const&) (t1=..., t1=..., t2=<synthetic pointer>..., t2=<synthetic pointer>...) at kernel/qcore_unix_p.h:145
#3  0x00007fe486b91cc3 in time_update (timeout=..., start=<synthetic pointer>..., tv=0x7fe3cbffebc0) at kernel/qcore_unix.cpp:114
#4  0x00007fe486b91cc3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7fe3a007d838, nfds=1, timeout_ts=0x0) at kernel/qcore_unix.cpp:169
#5  0x00007fe486b932dd in QVector<pollfd>::detach() (this=0x7fe3a0021eb0) at ../../include/QtCore/../../src/corelib/tools/qrefcount.h:102
#6  0x00007fe486b932dd in QVector<pollfd>::end() (this=0x7fe3a0021eb0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:214
#7  0x00007fe486b932dd in QVector<pollfd>::last() (this=0x7fe3a0021eb0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:245
#8  0x00007fe486b932dd in QVector<pollfd>::takeLast() (this=0x7fe3a0021eb0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:156
#9  0x00007fe486b932dd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:507
#10 0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#11 0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#12 0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#13 0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#14 0x00007fe485274479 in  () at /usr/lib/libQt5Qml.so.5
#15 0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x5597fb341a00) at thread/qthread_unix.cpp:363
#16 0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#17 0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7fe451718700 (LWP 6599)):
#0  0x00007fe4881f4ae6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fe486b91cc3 in normalizedTimespec(timespec&) (t=<synthetic pointer>...) at kernel/qcore_unix_p.h:116
#2  0x00007fe486b91cc3 in operator-(timespec const&, timespec const&) (t1=..., t1=..., t2=<synthetic pointer>..., t2=<synthetic pointer>...) at kernel/qcore_unix_p.h:145
#3  0x00007fe486b91cc3 in time_update (timeout=..., start=<synthetic pointer>..., tv=0x7fe451717bc0) at kernel/qcore_unix.cpp:114
#4  0x00007fe486b91cc3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7fe3a8018218, nfds=1, timeout_ts=0x0) at kernel/qcore_unix.cpp:169
#5  0x00007fe486b932dd in QVector<pollfd>::detach() (this=0x7fe3a8014a00) at ../../include/QtCore/../../src/corelib/tools/qrefcount.h:102
#6  0x00007fe486b932dd in QVector<pollfd>::end() (this=0x7fe3a8014a00) at ../../include/QtCore/../../src/corelib/tools/qvector.h:214
#7  0x00007fe486b932dd in QVector<pollfd>::last() (this=0x7fe3a8014a00) at ../../include/QtCore/../../src/corelib/tools/qvector.h:245
#8  0x00007fe486b932dd in QVector<pollfd>::takeLast() (this=0x7fe3a8014a00) at ../../include/QtCore/../../src/corelib/tools/qvector.h:156
#9  0x00007fe486b932dd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:507
#10 0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#11 0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#12 0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#13 0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#14 0x00007fe485274479 in  () at /usr/lib/libQt5Qml.so.5
#15 0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x5597f896f230) at thread/qthread_unix.cpp:363
#16 0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#17 0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7fe46fbff700 (LWP 6594)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe486968cc4 in QWaitConditionPrivate::wait(QDeadlineTimer) (deadline=..., this=0x5597f853fa90) at thread/qwaitcondition_unix.cpp:158
#2  0x00007fe486968cc4 in QWaitCondition::wait(QMutex*, QDeadlineTimer) (this=<optimized out>, mutex=0x5597f8544c40, deadline=...) at thread/qwaitcondition_unix.cpp:225
#3  0x00007fe486968da2 in QWaitCondition::wait(QReadWriteLock*, QDeadlineTimer) (this=0x5597f853fae4, readWriteLock=0x80, deadline=...) at thread/qwaitcondition_unix.cpp:240
#4  0x0000000000000000 in  ()

Thread 11 (Thread 0x7fe47dc3e700 (LWP 6593)):
#0  0x00007fe4881f4ae6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fe486b91cc3 in normalizedTimespec(timespec&) (t=<synthetic pointer>...) at kernel/qcore_unix_p.h:116
#2  0x00007fe486b91cc3 in operator-(timespec const&, timespec const&) (t1=..., t1=..., t2=<synthetic pointer>..., t2=<synthetic pointer>...) at kernel/qcore_unix_p.h:145
#3  0x00007fe486b91cc3 in time_update (timeout=..., start=<synthetic pointer>..., tv=0x7fe47dc3dbc0) at kernel/qcore_unix.cpp:114
#4  0x00007fe486b91cc3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7fe474057f18, nfds=1, timeout_ts=0x0) at kernel/qcore_unix.cpp:169
#5  0x00007fe486b932dd in QVector<pollfd>::detach() (this=0x7fe4740a19f0) at ../../include/QtCore/../../src/corelib/tools/qrefcount.h:102
#6  0x00007fe486b932dd in QVector<pollfd>::end() (this=0x7fe4740a19f0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:214
#7  0x00007fe486b932dd in QVector<pollfd>::last() (this=0x7fe4740a19f0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:245
#8  0x00007fe486b932dd in QVector<pollfd>::takeLast() (this=0x7fe4740a19f0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:156
#9  0x00007fe486b932dd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:507
#10 0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#11 0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#12 0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#13 0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#14 0x00007fe485274479 in  () at /usr/lib/libQt5Qml.so.5
#15 0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x5597f8c53a20) at thread/qthread_unix.cpp:363
#16 0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#17 0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7fe3b9925700 (LWP 5369)):
#0  0x00007fe486b932ce in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at ../../include/QtCore/../../src/corelib/tools/qarraydata.h:211
#1  0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#2  0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#3  0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#4  0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#5  0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x5597f727c040) at thread/qthread_unix.cpp:363
#6  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7fe452f3a700 (LWP 2404)):
#0  0x00007fe4881f4ae6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fe486b91cc3 in normalizedTimespec(timespec&) (t=<synthetic pointer>...) at kernel/qcore_unix_p.h:116
#2  0x00007fe486b91cc3 in operator-(timespec const&, timespec const&) (t1=..., t1=..., t2=<synthetic pointer>..., t2=<synthetic pointer>...) at kernel/qcore_unix_p.h:145
#3  0x00007fe486b91cc3 in time_update (timeout=..., start=<synthetic pointer>..., tv=0x7fe452f39bc0) at kernel/qcore_unix.cpp:114
#4  0x00007fe486b91cc3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7fe44c001cb8, nfds=1, timeout_ts=0x0) at kernel/qcore_unix.cpp:169
#5  0x00007fe486b932dd in QVector<pollfd>::detach() (this=0x7fe44c000bf0) at ../../include/QtCore/../../src/corelib/tools/qrefcount.h:102
#6  0x00007fe486b932dd in QVector<pollfd>::end() (this=0x7fe44c000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:214
#7  0x00007fe486b932dd in QVector<pollfd>::last() (this=0x7fe44c000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:245
#8  0x00007fe486b932dd in QVector<pollfd>::takeLast() (this=0x7fe44c000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:156
#9  0x00007fe486b932dd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:507
#10 0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#11 0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#12 0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#13 0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#14 0x00007fe485274479 in  () at /usr/lib/libQt5Qml.so.5
#15 0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x5597f73b7570) at thread/qthread_unix.cpp:363
#16 0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#17 0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7fe452739700 (LWP 1598)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe48645ef3c in  () at /usr/lib/libQt5Script.so.5
#2  0x00007fe48645ef59 in  () at /usr/lib/libQt5Script.so.5
#3  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7fe46cdbb700 (LWP 1555)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe46ec27dcc in  () at /usr/lib/dri/i965_dri.so
#2  0x00007fe46ec279c8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7fe46d5bc700 (LWP 1554)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe46ec27dcc in  () at /usr/lib/dri/i965_dri.so
#2  0x00007fe46ec279c8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fe46ddbd700 (LWP 1553)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe46ec27dcc in  () at /usr/lib/dri/i965_dri.so
#2  0x00007fe46ec279c8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fe46e5be700 (LWP 1552)):
#0  0x00007fe485b2ec45 in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fe46ec27dcc in  () at /usr/lib/dri/i965_dri.so
#2  0x00007fe46ec279c8 in  () at /usr/lib/dri/i965_dri.so
#3  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fe47d17d700 (LWP 1525)):
#0  0x00007fe486b93467 in QVector<pollfd>::reserve(int) (asize=<optimized out>, this=0x7fe468000bf0) at ../../include/QtCore/../../src/corelib/tools/qarraydata.h:220
#1  0x00007fe486b93467 in QVector<pollfd>::reserve(int) (asize=<optimized out>, this=0x7fe468000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:417
#2  0x00007fe486b93467 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:489
#3  0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#4  0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#5  0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#6  0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#7  0x00007fe485274479 in  () at /usr/lib/libQt5Qml.so.5
#8  0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x5597f6965cc0) at thread/qthread_unix.cpp:363
#9  0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#10 0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fe47ef25700 (LWP 1409)):
#0  0x00007fe4881f4ae6 in ppoll () at /usr/lib/libc.so.6
#1  0x00007fe486b91cc3 in normalizedTimespec(timespec&) (t=<synthetic pointer>...) at kernel/qcore_unix_p.h:116
#2  0x00007fe486b91cc3 in operator-(timespec const&, timespec const&) (t1=..., t1=..., t2=<synthetic pointer>..., t2=<synthetic pointer>...) at kernel/qcore_unix_p.h:145
#3  0x00007fe486b91cc3 in time_update (timeout=..., start=<synthetic pointer>..., tv=0x7fe47ef24bb0) at kernel/qcore_unix.cpp:114
#4  0x00007fe486b91cc3 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7fe47000b248, nfds=1, timeout_ts=0x0) at kernel/qcore_unix.cpp:169
#5  0x00007fe486b932dd in QVector<pollfd>::detach() (this=0x7fe470000bf0) at ../../include/QtCore/../../src/corelib/tools/qrefcount.h:102
#6  0x00007fe486b932dd in QVector<pollfd>::end() (this=0x7fe470000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:214
#7  0x00007fe486b932dd in QVector<pollfd>::last() (this=0x7fe470000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:245
#8  0x00007fe486b932dd in QVector<pollfd>::takeLast() (this=0x7fe470000bf0) at ../../include/QtCore/../../src/corelib/tools/qvector.h:156
#9  0x00007fe486b932dd in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:507
#10 0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#11 0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#12 0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#13 0x00007fe486961e62 in QThread::exec() (this=<optimized out>) at thread/qmutex.h:247
#14 0x00007fe487c2fb28 in QHashData::firstNode() (this=0x7fe487cb4060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/tools/qhash.h:127
#15 0x00007fe487c2fb28 in QHash<QString, QDBusConnectionPrivate*>::constBegin() const (this=0x7fe487cb4078 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder+24>) at ../../include/QtCore/../../src/corelib/tools/qhash.h:477
#16 0x00007fe487c2fb28 in QDBusConnectionManager::run() (this=0x7fe487cb4060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:183
#17 0x00007fe486962fd6 in QThreadPrivate::start(void*) (arg=0x7fe487cb4060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:363
#18 0x00007fe485b284cf in start_thread () at /usr/lib/libpthread.so.0
#19 0x00007fe4881ff2d3 in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fe480384840 (LWP 1320)):
[KCrash Handler]
#6  0x00007fe487ef502f in KWin::Workspace::workspaceEvent(xcb_generic_event_t*) () at /usr/lib/libkwin.so.5
#7  0x00007fe486b3ad77 in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) (this=<optimized out>, eventType=..., message=0x7fe4780ad9e0, result=0x7ffcdf53dbb8) at ../../include/QtCore/../../src/corelib/tools/qlist.h:176
#8  0x00007fe47ff0bab3 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) (this=0x5597f66c8aa0, event=0x7fe4780ad9e0) at qxcbconnection.cpp:549
#9  0x00007fe47ff0c839 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x5597f66c8aa0, flags=...) at qxcbconnection.cpp:1021
#10 0x00007fe47ff35dee in  () at qxcbeventdispatcher.cpp:152
#11 0x00007fe470007c20 in  ()
#12 0x00007fe470007c7c in  ()
#13 0x00007ffcdf53dd00 in  ()
#14 0x00007fe486b3c39c in QStack<QEventLoop*>::pop() (this=0x5597f66b0040) at ../../include/QtCore/../../src/corelib/tools/qstack.h:61
#15 0x00007fe486b3c39c in QEventLoop::LoopReference::~LoopReference (this=<synthetic pointer>, __in_chrg=<optimized out>) at kernel/qeventloop.cpp:201
#16 0x00007fe486b3c39c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:208
#17 0x00007fe486b443a6 in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1406
#18 0x00007fe4882cf379 in kdemain () at /usr/lib/libkdeinit5_kwin_x11.so
#19 0x00007fe488127153 in __libc_start_main () at /usr/lib/libc.so.6
#20 0x00005597f56bc05e in _start ()
[Inferior 1 (process 1320) detached]

Possible duplicates by query: bug 416401, bug 415824, bug 415750, bug 414524, bug 414317.

Reported using DrKonqi