https://bugs.kde.org/show_bug.cgi?id=514229
Bug ID: 514229
Summary: kwin_wayland crashed in KWin::LogicalOutput::scale()
when waking up a laptop connected to an external
screen
Classification: Plasma
Product: kwin
Version First 6.5.80
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: generic-crash
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
STEPS TO REPRODUCE
1. Have KWin build from git master (2ce9929c4faab90860e069f57f8aed3a967e57a0)
on KDE Linux
2. Put laptop to sleep by closing its lid
3. While in that state, plug in a USB-C monitor
4. Open the lid to wake it up
OBSERVED RESULT
kwin_wayland crashed:
#0 0x00007fa4b9ca690c in ??? () at /usr/lib/libc.so.6
#1 0x00007fa4b9c4c3a0 in raise () at /usr/lib/libc.so.6
#2 0x00007fa4bcf736c5 in KCrash::defaultCrashHandler (sig=11)
at /home/nate/kde/src/kcrash/src/kcrash.cpp:605
#3 0x00007fa4b9c4c4d0 in <signal handler called> () at /usr/lib/libc.so.6
#4 KWin::LogicalOutput::scale (this=this@entry=0x0)
at /home/nate/kde/src/kwin/src/core/output.cpp:392
#5 0x00007fa4bd2ab2c4 in KWin::LogicalOutput::geometryF (this=this@entry=0x0)
at /home/nate/kde/src/kwin/src/core/output.cpp:402
#6 0x00007fa4bd284a73 in KWin::Compositor::assignOutputLayers
(this=0x56357f2b3a50, output=0x56357f134800)
at /home/nate/kde/src/kwin/src/compositor.cpp:1015
#7 0x00007fa4ba3c834f in ??? () at /usr/lib/libQt6Core.so.6
#8 0x00007fa4bd5e9108 in KWin::DrmOutput::applyQueuedChanges
(this=this@entry=0x56357f134800,
props=std::shared_ptr<KWin::OutputChangeSet> (use count 2, weak count 0) =
{...}) at /home/nate/kde/src/kwin/src/backends/drm/drm_output.cpp:492
#9 0x00007fa4bd5ab744 in KWin::DrmBackend::applyOutputChanges
(this=0x56357eed0180, config=...)
at /home/nate/kde/src/kwin/src/backends/drm/drm_backend.cpp:417
#10 0x00007fa4bd54bb18 in KWin::Workspace::applyOutputConfiguration
(this=0x56357f330db0, config=...) at
/home/nate/kde/src/kwin/src/workspace.cpp:526
#11 0x00007fa4bd54bf6e in operator() (__closure=0x56357fbfe4d0)
at /home/nate/kde/src/kwin/src/workspace.cpp:239
#12 operator() (__closure=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:116
#13 QtPrivate::FunctorCallBase::call_internal<void,
QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>,
QtPrivate::List<>, void, KWin::Workspace::init()::<lambda()>
>::call(KWin::Workspace::init()::<lambda()>&, void**)::<lambda()> >
(args=<optimized out>, fn=<optimized out>)
at /usr/include/qt6/QtCore/qobjectdefs_impl.h:65
#14 QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>,
QtPrivate::List<>, void, KWin::Workspace::init()::<lambda()> >::call (f=...,
arg=<optimized out>)
at /usr/include/qt6/QtCore/qobjectdefs_impl.h:115
#15 QtPrivate::FunctorCallable<KWin::Workspace::init()::<lambda()>
>::call<QtPrivate::List<>, void> (f=..., arg=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:337
#16 QtPrivate::QCallableObject<KWin::Workspace::init()::<lambda()>,
QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *,
void **, bool *)
(which=<optimized out>, this_=0x56357fbfe4c0, r=<optimized out>,
a=<optimized out>, ret=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:547
#17 0x00007fa4ba3c834f in ??? () at /usr/lib/libQt6Core.so.6
#18 0x00007fa4bd36294d in KWin::InputRedirection::processSpies<void
(KWin::InputEventSpy::*)(KWin::SwitchEvent*), KWin::SwitchEvent*>
(this=<optimized out>, method=<optimized out>)
at /home/nate/kde/src/kwin/src/input.h:166
#19 operator()
(__closure=<optimized out>, state=<optimized out>,
time=std::chrono::duration = { <optimized out>us }, device=<optimized out>) at
/home/nate/kde/src/kwin/src/input.cpp:3329
#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, 0, 1, 2>,
QtPrivate::List<KWin::SwitchState, std::chrono::duration<long int,
std::ratio<1, 1000000> >, KWin::InputDevice*>, void,
KWin::InputRedirection::addInputDevice(KWin::InputDevice*)::<lambda(KWin::SwitchState,
std::chrono::microseconds, KWin::InputDevice*)>
>::call(KWin::InputRedirection::addInputDevice(KWin::InputDevice*)::<lambda(KWin::SwitchState,
std::chrono::microseconds, KWin::InputDevice*)>&, void**)::<lambda()> >
(args=<optimized out>, fn=<optimized out>)
at /usr/include/qt6/QtCore/qobjectdefs_impl.h:65
#22 QtPrivate::FunctorCall<std::integer_sequence<long unsigned int, 0, 1, 2>,
QtPrivate::List<KWin::SwitchState, std::chrono::duration<long int,
std::ratio<1, 1000000> >, KWin::InputDevice*>, void,
KWin::InputRedirection::addInputDevice(KWin::InputDevice*)::<lambda(KWin::SwitchState,
std::chrono::microseconds, KWin::InputDevice*)> >::call (f=<optimized out>,
arg=<optimized out>)
at /usr/include/qt6/QtCore/qobjectdefs_impl.h:115
#23
QtPrivate::FunctorCallable<KWin::InputRedirection::addInputDevice(KWin::InputDevice*)::<lambda(KWin::SwitchState,
std::chrono::microseconds, KWin::InputDevice*)>, KWin::SwitchState,
std::chrono::duration<long int, std::ratio<1, 1000000> >,
KWin::InputDevice*>::call<QtPrivate::List<KWin::SwitchState,
std::chrono::duration<long, std::ratio<1, 1000000> >, KWin::InputDevice*>,
void>
(f=<optimized out>, arg=<optimized out>) at
/usr/include/qt6/QtCore/qobjectdefs_impl.h:337
#24
QtPrivate::QCallableObject<KWin::InputRedirection::addInputDevice(KWin::InputDevice*)::<lambda(KWin::SwitchState,
std::chrono::microseconds, KWin::InputDevice*)>,
QtPrivate::List<KWin::SwitchState, std::chrono::duration<long int,
std::ratio<1, 1000000> >, KWin::InputDevice*>, 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
#25 0x00007fa4ba3c8418 in ??? () at /usr/lib/libQt6Core.so.6
#26 0x00007fa4bd2a7d7d in QMetaObject::activate<void, KWin::SwitchState,
std::chrono::duration<long, std::ratio<1l, 1000000l> >, KWin::InputDevice*>
(sender=0x56357fe81ec0, mo=0x7fa4bd906620
<KWin::InputDevice::staticMetaObject>, local_signal_index=22, ret=0x0) at
/usr/include/qt6/QtCore/qobjectdefs.h:319
#27 KWin::InputDevice::switchToggle
(this=this@entry=0x56357fe81ec0, _t1=<optimized out>,
_t2=_t2@entry=std::chrono::duration = { 203253572383us }, _t3=<optimized out>,
_t3@entry=0x56357fe81ec0)
at
/home/nate/kde/build/kwin/src/kwin_autogen/include/moc_inputdevice.cpp:851
#28 0x00007fa4bd60b6fc in KWin::LibInput::Connection::processEvents
(this=0x56357f1d5260)
at /home/nate/kde/src/kwin/src/backends/libinput/connection.cpp:474
#29 0x00007fa4ba3b5994 in QObject::event(QEvent*) () at
/usr/lib/libQt6Core.so.6
#30 0x00007fa4bb52b1c0 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
()
at /usr/lib/libQt6Widgets.so.6
#31 0x00007fa4ba35b958 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
()
at /usr/lib/libQt6Core.so.6
#32 0x00007fa4ba35bd30 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*)
() at /usr/lib/libQt6Core.so.6
#33 0x00007fa4ba51ed4d in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt6Core.so.6
#34 0x00007fa4bb200b73 in
QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() at /usr/lib/libQt6Gui.so.6
#35 0x00007fa4ba366786 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /usr/lib/libQt6Core.so.6
#36 0x00007fa4ba3603f1 in QCoreApplication::exec() () at
/usr/lib/libQt6Core.so.6
#37 0x000056355f4f2e94 in main (argc=<optimized out>, argv=<optimized out>)
at /home/nate/kde/src/kwin/src/main_wayland.cpp:634
(gdb)
SOFTWARE/OS VERSIONS
Operating System: KDE Linux 2025-12-31
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.23.0
Qt Version: 6.10.1
Kernel Version: 6.18.2-zen2-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7840U w/ Radeon™ 780M Graphics
Memory: 17 GB of RAM (16.0 GB usable)
Graphics Processor: AMD Radeon 780M Graphics
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