Created attachment 187874 [details] kwin_wayland.kcrash saved by crash handler SUMMARY After every boot up, kwin_wayland crashes. It happens consistently on every boot or reboot. This bug happens since KDE Plasma 6.5.4 was introduced. STEPS TO REPRODUCE 1. Boot 2. kwin crashes OBSERVED RESULT Kwin crashes. EXPECTED RESULT Kwin should not crash. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.21.0 Qt Version: 6.10.1 Kernel Version: 6.18.1-zen1-2-zen (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 9700X 8-Core Processor Memory: 64 GiB of RAM (60.5 GiB usable) Graphics Processor 1: AMD Radeon RX 9070 XT Graphics Processor 2: AMD Ryzen 7 9700X 8-Core Processor Manufacturer: ASUS
Thread 1 (Thread 0x7f5c3d72bb80 (LWP 5134)): [KCrash Handler] #5 0x00007f5c449d500b in std::__atomic_base<QObjectPrivate::ConnectionData*>::load (this=0x6320b1bbe17320d0, __m=std::memory_order_relaxed) at /usr/include/c++/15.2.1/bits/atomic_base.h:830 #6 std::atomic<QObjectPrivate::ConnectionData*>::load (this=0x6320b1bbe17320d0, __m=std::memory_order_relaxed) at /usr/include/c++/15.2.1/atomic:587 #7 QAtomicOps<QObjectPrivate::ConnectionData*>::loadRelaxed<QObjectPrivate::ConnectionData*> (_q_value=<error reading variable: Cannot access memory at address 0x6320b1bbe17320d0>) at /usr/src/debug/qt6-base/qtbase/src/corelib/thread/qatomic_cxx11.h:203 #8 QBasicAtomicPointer<QObjectPrivate::ConnectionData>::loadRelaxed (this=0x6320b1bbe17320d0) at /usr/src/debug/qt6-base/qtbase/src/corelib/thread/qbasicatomic.h:171 #9 QObjectPrivate::removeConnection (c=0x7f5c380194d0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:5646 #10 0x00007f5c449c5704 in QObject::disconnect (connection=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:5449 #11 0x00007f5c44a2add4 in QTextStreamPrivate::disconnectFromDevice (this=0x56232162f680) at /usr/src/debug/qt6-base/qtbase/src/corelib/serialization/qtextstream.cpp:338 #12 QTextStreamPrivate::~QTextStreamPrivate (this=<optimized out>, this=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/serialization/qtextstream.cpp:272 #13 std::default_delete<QTextStreamPrivate>::operator() (this=<optimized out>, __ptr=0x56232162f680) at /usr/include/c++/15.2.1/bits/unique_ptr.h:92 #14 std::unique_ptr<QTextStreamPrivate, std::default_delete<QTextStreamPrivate> >::~unique_ptr (this=<optimized out>, this=<optimized out>) at /usr/include/c++/15.2.1/bits/unique_ptr.h:398 #15 QTextStream::~QTextStream (this=<optimized out>, this=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/serialization/qtextstream.cpp:1065 #16 0x00007f5c44a2af15 in QTextStream::~QTextStream (this=<optimized out>, this=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/serialization/qtextstream.cpp:1065 #17 0x00007f5c2413b705 in KWin::OutputScreenCastSource::render (this=this@entry=0x562320a118c0, target=0x562322bd2fd0, bufferRepair=...) at /usr/src/debug/kwin/kwin-6.5.4/src/plugins/screencast/outputscreencastsource.cpp:95 #18 0x00007f5c2414da70 in KWin::ScreenCastStream::record (this=0x562320c7f630, contents=...) at /usr/include/c++/15.2.1/bits/unique_ptr.h:192 #19 0x00007f5c2414dc64 in operator() (__closure=0x562323494f90) at /usr/src/debug/kwin/kwin-6.5.4/src/plugins/screencast/screencaststream.cpp:353 #20 operator() (__closure=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:116 #21 QtPrivate::FunctorCallBase::call_internal<void, QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>, QtPrivate::List<>, void, KWin::ScreenCastStream::ScreenCastStream(KWin::ScreenCastSource*, std::shared_ptr<KWin::PipeWireCore>, QObject*)::<lambda()> >::call(KWin::ScreenCastStream::ScreenCastStream(KWin::ScreenCastSource*, std::shared_ptr<KWin::PipeWireCore>, QObject*)::<lambda()>&, void**)::<lambda()> > (args=<optimized out>, fn=...) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:65 #22 QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>, QtPrivate::List<>, void, KWin::ScreenCastStream::ScreenCastStream(KWin::ScreenCastSource*, std::shared_ptr<KWin::PipeWireCore>, QObject*)::<lambda()> >::call (f=..., arg=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:115 #23 QtPrivate::FunctorCallable<KWin::ScreenCastStream::ScreenCastStream(KWin::ScreenCastSource*, std::shared_ptr<KWin::PipeWireCore>, QObject*)::<lambda()> >::call<QtPrivate::List<>, void> (f=..., arg=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:337 #24 QtPrivate::QCallableObject<KWin::ScreenCastStream::ScreenCastStream(KWin::ScreenCastSource*, std::shared_ptr<KWin::PipeWireCore>, QObject*)::<lambda()>, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=0x562323494f80, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/qt6/QtCore/qobjectdefs_impl.h:547 #25 0x00007f5c449d734f in QtPrivate::QSlotObjectBase::call (this=<optimized out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:461 #26 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>, argv=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4257 #27 0x00007f5c449dee5c in QMetaObject::activate<void, QTimer::QPrivateSignal> (sender=<optimized out>, mo=<optimized out>, local_signal_index=0, ret=0x0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs.h:319 #28 QTimer::timeout (this=<optimized out>, _t1=...) at /usr/src/debug/qt6-base/build/src/corelib/Core_autogen/include/moc_qtimer.cpp:182 #29 QTimer::timerEvent (e=<optimized out>, this=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qtimer.cpp:331 #30 QTimer::timerEvent (this=<optimized out>, e=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qtimer.cpp:325 #31 0x00007f5c449c4936 in QObject::event (this=<optimized out>, e=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:1388 #32 0x00007f5c45b021c0 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x562320c7f7f0, e=0x7ffd7bfc98a0) at /usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:3305 #33 0x00007f5c4496a958 in QCoreApplication::notifyInternal2 (receiver=0x562320c7f7f0, event=0x7ffd7bfc98a0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1109 #34 0x00007f5c44b2c9af in QCoreApplication::sendEvent (receiver=<optimized out>, event=0x7ffd7bfc98a0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1549 #35 QTimerInfoList::activateTimers (this=this@entry=0x5623205771d8) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qtimerinfo_unix.cpp:426 #36 0x00007f5c44b2e549 in QEventDispatcherUNIXPrivate::activateTimers (this=0x562320577100) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:221 #37 QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=..., flags@entry=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:503 #38 0x00007f5c45734b73 in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at /usr/src/debug/qt6-base/qtbase/src/gui/platform/unix/qunixeventdispatcher.cpp:28 #39 0x00007f5c44975786 in QEventLoop::processEvents (this=0x7ffd7bfc9a80, flags=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:104 #40 QEventLoop::exec (this=0x7ffd7bfc9a80, flags=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:186 #41 0x00007f5c4496f3f1 in QCoreApplication::exec () at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1452 #42 0x00007f5c45afd32a in QApplication::exec () at /usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:2575 #43 0x0000562308dedaa4 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin/kwin-6.5.4/src/main_wayland.cpp:635
*** Bug 514475 has been marked as a duplicate of this bug. ***
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/8629
Git commit a106dc4a535f6dc44b4c7a291ad601dc5b0fc1e2 by Xaver Hugl. Committed on 12/01/2026 at 16:10. Pushed by zamundaaa into branch 'master'. plugins/screencast: close screencasts on GPU reset Ideally we'd make the scene persistent and handle GPU resets in the screencast plugin, but until that's done, closing the screencast is better than crashing. Fixes https://crash-reports.kde.org/share/issue/73d294e21e53493798c996509bdc5240/ M +3 -0 src/plugins/screencast/outputscreencastsource.cpp M +1 -0 src/plugins/screencast/regionscreencastsource.cpp M +3 -0 src/plugins/screencast/windowscreencastsource.cpp https://invent.kde.org/plasma/kwin/-/commit/a106dc4a535f6dc44b4c7a291ad601dc5b0fc1e2
Git commit 4a5adcba9e315460a09714c92266a8331f783211 by Vlad Zahorodnii, on behalf of Xaver Hugl. Committed on 22/01/2026 at 10:41. Pushed by vladz into branch 'Plasma/6.5'. plugins/screencast: close screencasts on GPU reset Ideally we'd make the scene persistent and handle GPU resets in the screencast plugin, but until that's done, closing the screencast is better than crashing. Fixes https://crash-reports.kde.org/share/issue/73d294e21e53493798c996509bdc5240/ (cherry picked from commit a106dc4a535f6dc44b4c7a291ad601dc5b0fc1e2) M +3 -0 src/plugins/screencast/outputscreencastsource.cpp M +1 -0 src/plugins/screencast/regionscreencastsource.cpp M +3 -0 src/plugins/screencast/windowscreencastsource.cpp https://invent.kde.org/plasma/kwin/-/commit/4a5adcba9e315460a09714c92266a8331f783211