Bug 497423

SUMMARY
Last few days kwin_wayland has been crashing for me every few hours. Seems to be in the screencast plugin, even though i'm not doing any screencasting or similar. The 3 times it has happened so far i've had firefox running with many tabs opened, but that could be a coincidence.

STEPS TO REPRODUCE
Not sure yet..

OBSERVED RESULT
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0 --xwayland-fd 8 --xwayl'.
Program terminated with signal SIGSEGV, Segmentation fault.

warning: Section `.reg-xstate/1805' in core file too small.
#0  0x000056157d1695b7 in KWin::ScreenCastStream::buildFormats (this=this@entry=0x56157eeb7a70, fixate=false, buffer=buffer@entry=0x7ffed5e9cab0 "") at /usr/include/c++/12/bits/unique_ptr.h:191
191           pointer    _M_ptr() const noexcept { return std::get<0>(_M_t); }
[Current thread is 1 (Thread 0x7f323a33de80 (LWP 1805))]
(gdb) bt
#0  0x000056157d1695b7 in KWin::ScreenCastStream::buildFormats(bool, char*) (this=this@entry=0x56157eeb7a70, fixate=false, buffer=buffer@entry=0x7ffed5e9cab0 "")
    at /usr/include/c++/12/bits/unique_ptr.h:191
#1  0x000056157d169974 in KWin::ScreenCastStream::onStreamRenegotiateFormat(void*, unsigned long) (data=0x56157eeb7a70) at ./src/plugins/screencast/screencaststream.cpp:296
#2  0x00007f3206a0c7f9 in source_event_func (source=0x56157fc90c80) at ../spa/plugins/support/loop.c:615
#3  0x00007f3206a0eece in loop_iterate (object=0x56157fca3e98, timeout=0) at ../spa/plugins/support/loop.c:452
#4  0x000056157d15fe8e in operator() (__closure=<optimized out>) at ./src/plugins/screencast/pipewirecore.cpp:67
#5  QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KWin::PipeWireCore::init()::<lambda()> >::call (arg=<optimized out>, f=<optimized out>)
    at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:146
#6  QtPrivate::Functor<KWin::PipeWireCore::init()::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=<optimized out>)
    at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:256
#7  QtPrivate::QFunctorSlotObject<KWin::PipeWireCore::init()::<lambda()>, 0, 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/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:443
#8  0x00007f323fae8f8f in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffed5e9d740, r=0x56157fc883d0, this=0x56157fcfe650)
    at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#9  doActivate<false>(QObject*, int, void**) (sender=0x56157f071a90, signal_index=3, argv=0x7ffed5e9d740) at kernel/qobject.cpp:3923
#10 0x00007f323fae222f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**)
    (sender=sender@entry=0x56157f071a90, m=m@entry=0x7f323fd4d1a0 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffed5e9d740)
    at kernel/qobject.cpp:3983
#11 0x00007f323faec2cf in QSocketNotifier::activated(QSocketDescriptor, QSocketNotifier::Type, QSocketNotifier::QPrivateSignal) (this=this@entry=0x56157f071a90, _t1=..., _t2=<optimized out>, _t3=...)
    at .moc/moc_qsocketnotifier.cpp:178
#12 0x00007f323faecad5 in QSocketNotifier::event(QEvent*) (this=0x56157f071a90, e=<optimized out>) at kernel/qsocketnotifier.cpp:302
#13 0x00007f323ef62fae in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x56157f071a90, e=0x7ffed5e9d840) at kernel/qapplication.cpp:3640
#14 0x00007f323fab1738 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x56157f071a90, event=0x7ffed5e9d840) at kernel/qcoreapplication.cpp:1064
#15 0x00007f323fab18fe in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:1462
#16 0x00007f323fb06cb3 in QEventDispatcherUNIXPrivate::activateSocketNotifiers() (this=this@entry=0x56157da9c7a0) at kernel/qeventdispatcher_unix.cpp:304
#17 0x00007f323fb07177 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:511
#18 0x000056157d22b96d in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
#19 0x00007f323fab01bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffed5e9d9d0, flags=..., flags@entry=...)
    at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#20 0x00007f323fab8316 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#21 0x00007f323ff30ecc in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1863
#22 0x00007f323ef62f25 in QApplication::exec() () at kernel/qapplication.cpp:2832
#23 0x000056157d136f28 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./src/main_wayland.cpp:628
(gdb) 


EXPECTED RESULT
No crash

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION