Created attachment 188423 [details]
New crash information added by DrKonqi

DrKonqi auto-attaching complete backtrace.

Probably a duplicate of 511757?

Searchable backtrace of the crashing process

Thread 1 (Thread 0x7f4b6d1f9f00 (LWP 4546)):
[KCrash Handler]
#5  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#6  0x00007f4b73881493 in __pthread_kill_internal (threadid=<optimized out>, signo=6) at pthread_kill.c:89
#7  0x00007f4b7382715e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#8  0x00007f4b7380e6d0 in __GI_abort () at abort.c:77
#9  0x00007f4b73e1b204 in qAbort () at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/global/qassert.cpp:46
#10 0x00007f4b73e6fdf9 in qt_maybe_message_fatal<QString&> (msgType=QtFatalMsg, context=<optimized out>, message=...) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/global/qlogging.cpp:2166
#11 qt_message(QtMsgType, const QMessageLogContext &, const char *, typedef __va_list_tag __va_list_tag *) (msgType=msgType@entry=QtFatalMsg, context=..., msg=msg@entry=0x7f4b3ff94a70 "KWaylandBackend: no output modes available anymore, this seems like a compositor bug", ap=ap@entry=0x7fffccbc10c8) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/global/qlogging.cpp:412
#12 0x00007f4b73e1c996 in QMessageLogger::fatal (this=this@entry=0x7fffccbc1320, msg=msg@entry=0x7f4b3ff94a70 "KWaylandBackend: no output modes available anymore, this seems like a compositor bug") at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/global/qlogging.cpp:901
#13 0x00007f4b3ff7eed0 in operator() (__closure=<optimized out>) at /usr/src/debug/libkscreen-6.5.4-1.fc43.x86_64/backends/kwayland/waylandoutputdevice.cpp:73
#14 operator() (__closure=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:116
#15 QtPrivate::FunctorCallBase::call_internal<void, QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>, QtPrivate::List<>, void, KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()> >::call(KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>&, void**)::<lambda()> > (args=<optimized out>, fn=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:65
#16 QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>, QtPrivate::List<>, void, KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()> >::call (f=<optimized out>, arg=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:115
#17 QtPrivate::FunctorCallable<KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()> >::call<QtPrivate::List<>, void> (f=<optimized out>, arg=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:337
#18 QtPrivate::QCallableObject<KScreen::WaylandOutputDevice::kde_output_device_v2_mode(kde_output_device_mode_v2*)::<lambda()>, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=<optimized out>, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:547
#19 0x00007f4b73f6759a in QtPrivate::QSlotObjectBase::call (this=0x5625ee2a0000, r=0x5625ee360840, a=0x7fffccbc13d8) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qobjectdefs_impl.h:461
#20 doActivate<false> (sender=0x5625edc01b30, signal_index=<optimized out>, argv=<optimized out>) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qobject.cpp:4257
#21 0x00007f4b75028056 in ffi_call_unix64 () at ../src/x86/unix64.S:104
#22 0x00007f4b75023d16 in ffi_call_int (cif=cif@entry=0x7fffccbc15e0, fn=fn@entry=0x7f4b3ff7f330 <QtWayland::kde_output_device_mode_v2::handle_removed(void*, kde_output_device_mode_v2*)>, rvalue=<optimized out>, rvalue@entry=0x0, avalue=avalue@entry=0x7fffccbc16b0, closure=closure@entry=0x0) at ../src/x86/ffi64.c:676
#23 0x00007f4b750267ae in ffi_call (cif=cif@entry=0x7fffccbc15e0, fn=0x7f4b3ff7f330 <QtWayland::kde_output_device_mode_v2::handle_removed(void*, kde_output_device_mode_v2*)>, rvalue=rvalue@entry=0x0, avalue=avalue@entry=0x7fffccbc16b0) at ../src/x86/ffi64.c:713
#24 0x00007f4b76fc9feb in wl_closure_invoke (closure=closure@entry=0x7f4ab400ca50, target=<optimized out>, target@entry=0x7f4b54011ef0, opcode=opcode@entry=3, data=<optimized out>, flags=1) at ../src/connection.c:1241
#25 0x00007f4b76fcae49 in dispatch_event (display=display@entry=0x5625edaa9820, queue=queue@entry=0x5625edaa9918) at ../src/wayland-client.c:1707
#26 0x00007f4b76fcb243 in dispatch_queue (display=0x5625edaa9820, queue=0x5625edaa9918) at ../src/wayland-client.c:1853
#27 wl_display_dispatch_queue_pending (display=0x5625edaa9820, queue=0x5625edaa9918) at ../src/wayland-client.c:2190
#28 0x00007f4b758f91f2 in QtWaylandClient::EventThread::readAndDispatchEvents (this=0x5625edb175a0) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/plugins/platforms/wayland/qwaylanddisplay.cpp:230
#29 0x00007f4b758f1d71 in QtWaylandClient::QWaylandDisplay::flushRequests (this=<optimized out>) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/plugins/platforms/wayland/qwaylanddisplay.cpp:522
#30 0x00007f4b73f58fcc in QObject::event (this=<optimized out>, e=<optimized out>) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qobject.cpp:1413
#31 0x00007f4b7643db9f in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x5625edaa95f0, e=0x7f4b50004240) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/widgets/kernel/qapplication.cpp:3305
#32 0x00007f4b73efc4e8 in QCoreApplication::notifyInternal2 (receiver=0x5625edaa95f0, event=0x7f4b50004240) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1109
#33 0x00007f4b73efc74d in QCoreApplication::sendEvent (receiver=<optimized out>, event=<optimized out>) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1549
#34 0x00007f4b73effb09 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x5625eda9e660) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1904
#35 0x00007f4b7421efcf in postEventSourceDispatch (s=0x5625edaa6980) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:246
#36 0x00007f4b729b62a3 in g_main_dispatch (context=0x7f4b58000f60) at ../glib/gmain.c:3565
#37 g_main_context_dispatch_unlocked (context=0x7f4b58000f60) at ../glib/gmain.c:4425
#38 0x00007f4b729bf1f8 in g_main_context_iterate_unlocked (context=context@entry=0x7f4b58000f60, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4490
#39 0x00007f4b729bf3a3 in g_main_context_iteration (context=0x7f4b58000f60, may_block=1) at ../glib/gmain.c:4556
#40 0x00007f4b7421e80d in QEventDispatcherGlib::processEvents (this=0x5625edab40f0, flags=...) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:399
#41 0x00007f4b73f09063 in QEventLoop::exec (this=this@entry=0x7fffccbc1cf0, flags=..., flags@entry=...) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/global/qflags.h:77
#42 0x00007f4b73f04819 in QCoreApplication::exec () at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/kernel/qcoreapplication.cpp:1452
#43 0x00007f4b746df19d in QGuiApplication::exec () at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/gui/kernel/qguiapplication.cpp:1973
#44 0x00007f4b7643db09 in QApplication::exec () at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/widgets/kernel/qapplication.cpp:2575
#45 0x00005625ba4ea94d in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-workspace-6.5.4-1.fc43.x86_64/shell/main.cpp:188

Thanks for the crash report. Based on the backtrace, this is indeed another instance of bug 511757. I'll merge your report in with that one.

*** This bug has been marked as a duplicate of bug 511757 ***