https://bugs.kde.org/show_bug.cgi?id=501828
--- Comment #3 from postix <pos...@posteo.eu> ---
Backtrace of the crash:
```
#0 __pthread_kill_implementation (threadid=<optimized out>,
signo=signo@entry=11, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1 0x00007f3e1dc9b453 in __pthread_kill_internal (threadid=<optimized out>,
signo=11) at pthread_kill.c:89
#2 0x00007f3e1dc41cb6 in __GI_raise (sig=11) at ../sysdeps/posix/raise.c:26
#3 0x00007f3e21aa4a37 in KCrash::defaultCrashHandler (sig=11) at
/usr/src/debug/kcrash-6.12.0/src/kcrash.cpp:605
#4 0x00007f3e1dc41e00 in <signal handler called> () at /lib64/libc.so.6
#5 0x00007f3e21692129 in KWin::XdgPopupWindow::transientPlacement
(this=0x5558c07d4790)
at /usr/src/debug/kwin-6.3.3/src/xdgshellwindow.cpp:1787
#6 0x00007f3e2158d313 in KWin::Placement::placeTransient (this=<optimized
out>, c=0x5558c07d4790)
at /usr/src/debug/kwin-6.3.3/src/placement.cpp:512
#7 0x00007f3e21665d21 in KWin::Workspace::addWaylandWindow
(this=0x5558bef5c0d0, window=0x5558c07d4790)
at /usr/include/c++/14/bits/unique_ptr.h:193
#8 0x00007f3e1e60ed61 in QtPrivate::QSlotObjectBase::call
(this=0x5558bf0e2250, r=<optimized out>, a=0x7ffe3ac13590, this=<optimized
out>, r=<optimized out>, a=<optimized out>)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobjectdefs_impl.h:486
#9 doActivate<false> (sender=0x5558be0ce270, signal_index=3,
argv=0x7ffe3ac13590)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobject.cpp:4115
#10 0x00007f3e2163802f in KWin::WaylandServer::windowAdded (this=<optimized
out>, _t1=<optimized out>)
at
/usr/src/debug/kwin-6.3.3/build/src/kwin_autogen/include/moc_wayland_server.cpp:199
#11 0x00007f3e1e60ed61 in QtPrivate::QSlotObjectBase::call
(this=0x5558c0d66f00, r=<optimized out>, a=0x7ffe3ac13658, this=<optimized
out>, r=<optimized out>, a=<optimized out>)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobjectdefs_impl.h:486
#12 doActivate<false> (sender=0x5558c07d4790, signal_index=61,
argv=0x7ffe3ac13658)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobject.cpp:4115
#13 0x00007f3e1e60ed61 in QtPrivate::QSlotObjectBase::call
(this=0x5558c03d8740, r=<optimized out>, a=0x7ffe3ac13748, this=<optimized
out>, r=<optimized out>, a=<optimized out>)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobjectdefs_impl.h:486
#14 doActivate<false> (sender=0x5558bf004ff0, signal_index=26,
argv=0x7ffe3ac13748)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobject.cpp:4115
#15 0x00007f3e217c8dc8 in KWin::SurfaceInterfacePrivate::applyState
(this=0x5558bf508330, next=<optimized out>)
at /usr/src/debug/kwin-6.3.3/src/wayland/surface.cpp:737
#16 0x00007f3e217f7d56 in KWin::Transaction::apply (this=0x5558bf6539c0)
at /usr/src/debug/kwin-6.3.3/src/wayland/transaction.cpp:229
#17 0x00007f3e217f7eac in KWin::Transaction::tryApply (this=0x5558bf6539c0)
at /usr/src/debug/kwin-6.3.3/src/wayland/transaction.cpp:262
#18 0x00007f3e217f545c in operator() (__closure=0x5558c0d5e6d0) at
/usr/src/debug/kwin-6.3.3/src/wayland/transaction.cpp:51
#19 operator() (__closure=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:141
#20 QtPrivate::FunctorCallBase::call_internal<void,
QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void,
KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()>
>::call(KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()>&, void**)::<lambda()> >
(args=<optimized out>, fn=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:65
#21 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void,
KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()> >::call (f=..., arg=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:140
#22
QtPrivate::FunctorCallable<KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()> >::call<QtPrivate::List<>, void> (f=...,
arg=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:362
#23
QtPrivate::QCallableObject<KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()>, QtPrivate::List<>, void>::impl(int,
QtPrivate::QSlotObjectBase *, QObject *, void **, bool *)
(which=<optimized out>, this_=0x5558c0d5e6c0, r=<optimized out>,
a=<optimized out>, ret=<optimized out>)
at /usr/include/qt6/QtCore/qobjectdefs_impl.h:572
#24 0x00007f3e1e60ed61 in QtPrivate::QSlotObjectBase::call
(this=0x5558c0d5e6c0, r=<optimized out>, a=0x7ffe3ac13bc0, this=<optimized
out>, r=<optimized out>, a=<optimized out>)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobjectdefs_impl.h:486
#25 doActivate<false> (sender=0x5558bf591d30, signal_index=3,
argv=0x7ffe3ac13bc0)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qobject.cpp:4115
#26 0x00007f3e1e611ec3 in QSocketNotifier::activated
(this=this@entry=0x5558bf591d30, _t1=..., _t2=<optimized out>, _t3=...)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/build/src/corelib/Core_autogen/include/moc_qsocketnotifier.cpp:198
#27 0x00007f3e1e612aae in QSocketNotifier::event (this=0x5558bf591d30,
e=<optimized out>)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qsocketnotifier.cpp:327
#28 0x00007f3e1f9dee35 in QApplicationPrivate::notify_helper (this=<optimized
out>, receiver=0x5558bf591d30, e=0x7ffe3ac13d00)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/widgets/kernel/qapplication.cpp:3296
#29 0x00007f3e1e5adaf0 in QCoreApplication::notifyInternal2
(receiver=0x5558bf591d30, event=0x7ffe3ac13d00)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qcoreapplication.cpp:1172
#30 0x00007f3e1e71f9a4 in QEventDispatcherUNIXPrivate::activateSocketNotifiers
(this=0x5558be03e9e0)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qeventdispatcher_unix.cpp:254
#31 0x00007f3e1e72529a in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=..., flags@entry=...)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/kernel/qeventdispatcher_unix.cpp:470
#32 0x00007f3e1f2adf91 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#33 0x00007f3e1e5b599b in QEventLoop::exec (this=this@entry=0x7ffe3ac13ed0,
flags=..., flags@entry=...)
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/global/qflags.h:34
#34 0x00007f3e1e5b765a in QCoreApplication::exec () at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/corelib/global/qflags.h:74
#35 0x00007f3e1ee0f700 in QGuiApplication::exec ()
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/gui/kernel/qguiapplication.cpp:1975
#36 0x00007f3e1f9dc0f9 in QApplication::exec ()
at
/usr/src/debug/qtbase-everywhere-src-6.8.2/src/widgets/kernel/qapplication.cpp:2564
#37 0x00005558b053de52 in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/kwin-6.3.3/src/main_wayland.cpp:622
```
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