Application: kwin_x11 (5.16.5)

Qt Version: 5.12.3
Frameworks Version: 5.62.0
Operating System: Linux 5.0.0-29-generic x86_64
Distribution: KDE neon User Edition 5.16

-- Information about the crash:
- What I was doing when the application crashed:

- Unusual behavior I noticed:

Laptop resumed from suspend, but one of the external monitors did not wake up. I disconnected it from the thunderbolt port and reconnected it; Kwin crashed (hence this report) but the external monitor did work.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1de9266d00 (LWP 3019))]

Thread 6 (Thread 0x7f1db0b9c700 (LWP 3377)):
#0  0x00007f1de1b499f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f1de5103fb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f1de1b499f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x7f1de5103f68, cond=0x7f1de5103f90) at pthread_cond_wait.c:502
#2  0x00007f1de1b499f3 in __pthread_cond_wait (cond=0x7f1de5103f90, mutex=0x7f1de5103f68) at pthread_cond_wait.c:655
#3  0x00007f1de4e0d844 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#4  0x00007f1de4e0d889 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#5  0x00007f1de1b436db in start_thread (arg=0x7f1db0b9c700) at pthread_create.c:463
#6  0x00007f1de8bdf88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f1db1b9e700 (LWP 3343)):
#0  0x00007f1de1b499f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55df5ae3d328) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f1de1b499f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x55df5ae3d2d8, cond=0x55df5ae3d300) at pthread_cond_wait.c:502
#2  0x00007f1de1b499f3 in __pthread_cond_wait (cond=0x55df5ae3d300, mutex=0x55df5ae3d2d8) at pthread_cond_wait.c:655
#3  0x00007f1db269b91b in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007f1db269b527 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007f1de1b436db in start_thread (arg=0x7f1db1b9e700) at pthread_create.c:463
#6  0x00007f1de8bdf88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f1dc6579700 (LWP 3330)):
#0  0x00007f1de8bd2cf6 in __GI_ppoll (fds=fds@entry=0x7f1db4000d28, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f1de6126ab1 in ppoll (__ss=<optimized out>, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
#2  0x00007f1de6126ab1 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f1db4000d28) at kernel/qcore_unix.cpp:132
#3  0x00007f1de6126ab1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7f1db4000d28, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:153
#4  0x00007f1de61281be in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007f1de60cc03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f1dc6578d00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#6  0x00007f1de5ef34ca in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:531
#7  0x00007f1de053a115 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f1de5ef4c72 in QThreadPrivate::start(void*) (arg=0x55df5ae1c190) at thread/qthread_unix.cpp:361
#9  0x00007f1de1b436db in start_thread (arg=0x7f1dc6579700) at pthread_create.c:463
#10 0x00007f1de8bdf88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f1dcdb12700 (LWP 3100)):
#0  0x00007f1de8bd2cf6 in __GI_ppoll (fds=fds@entry=0x7f1dc0010e88, nfds=nfds@entry=1, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007f1de6126ab1 in ppoll (__ss=<optimized out>, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/poll2.h:77
#2  0x00007f1de6126ab1 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f1dc0010e88) at kernel/qcore_unix.cpp:132
#3  0x00007f1de6126ab1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7f1dc0010e88, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:153
#4  0x00007f1de61281be in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at kernel/qeventdispatcher_unix.cpp:500
#5  0x00007f1de60cc03a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f1dcdb11cf0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#6  0x00007f1de5ef34ca in QThread::exec() (this=this@entry=0x7f1ddf61ed80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:531
#7  0x00007f1ddf3a7015 in QDBusConnectionManager::run() (this=0x7f1ddf61ed80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#8  0x00007f1de5ef4c72 in QThreadPrivate::start(void*) (arg=0x7f1ddf61ed80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:361
#9  0x00007f1de1b436db in start_thread (arg=0x7f1dcdb12700) at pthread_create.c:463
#10 0x00007f1de8bdf88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f1dcf94e700 (LWP 3042)):
#0  0x00007f1de8bd2bf9 in __GI___poll (fds=0x7f1dcf94dc28, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f1de5c30747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f1de5c3236a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f1dd0c89578 in QXcbEventQueue::run() (this=0x55df5ab87030) at qxcbeventqueue.cpp:228
#4  0x00007f1de5ef4c72 in QThreadPrivate::start(void*) (arg=0x55df5ab87030) at thread/qthread_unix.cpp:361
#5  0x00007f1de1b436db in start_thread (arg=0x7f1dcf94e700) at pthread_create.c:463
#6  0x00007f1de8bdf88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f1de9266d00 (LWP 3019)):
[KCrash Handler]
#6  0x00007f1de86ae968 in std::__atomic_base<int>::load(std::memory_order) const (__m=std::memory_order_relaxed, this=0x21) at /usr/include/c++/7/bits/atomic_base.h:396
#7  0x00007f1de86ae968 in QAtomicOps<int>::load<int>(std::atomic<int> const&) (_q_value=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qatomic_cxx11.h:227
#8  0x00007f1de86ae968 in QBasicAtomicInteger<int>::load() const (this=0x21) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qbasicatomic.h:103
#9  0x00007f1de86ae968 in QtPrivate::RefCount::isShared() const (this=0x21) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qrefcount.h:101
#10 0x00007f1de86ae968 in QMap<KWin::Group*, KWin::Layer>::detach() (this=0x55df5b44da38) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qmap.h:364
#11 0x00007f1de86ae968 in QMap<KWin::Group*, KWin::Layer>::find(KWin::Group* const&) (akey=<optimized out>, this=0x55df5b44da38) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qmap.h:884
#12 0x00007f1de86ae968 in KWin::Workspace::constrainedStackingOrder() (this=this@entry=0x55df5ac8dca0) at ./layers.cpp:519
#13 0x00007f1de86af468 in KWin::Workspace::updateStackingOrder(bool) (this=0x55df5ac8dca0, propagate_new_clients=propagate_new_clients@entry=false) at ./layers.cpp:123
#14 0x00007f1de86ee595 in KWin::Client::setGeometry(int, int, int, int, KWin::AbstractClient::ForceGeometry_t) (this=0x55df5b42e520, x=<optimized out>, y=<optimized out>, w=3840, h=2160, force=<optimized out>) at ./geometry.cpp:1999
#15 0x00007f1de8800d35 in KWin::AbstractClient::setGeometry(QRect const&, KWin::AbstractClient::ForceGeometry_t) (force=KWin::AbstractClient::NormalGeometrySet, r=..., this=0x55df5b42e520) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/../../../abstract_client.h:1285
#16 0x00007f1de8800d35 in KWin::AbstractClient::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=_o@entry=0x55df5b42e520, _c=_c@entry=QMetaObject::WriteProperty, _id=_id@entry=28, _a=_a@entry=0x7ffe76efb220) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/moc_abstract_client.cpp:886
#17 0x00007f1de8806613 in KWin::AbstractClient::qt_metacall(QMetaObject::Call, int, void**) (this=this@entry=0x55df5b42e520, _c=_c@entry=QMetaObject::WriteProperty, _id=28, _a=_a@entry=0x7ffe76efb220) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/moc_abstract_client.cpp:935
#18 0x00007f1de8806675 in KWin::Client::qt_metacall(QMetaObject::Call, int, void**) (this=0x55df5b42e520, _c=QMetaObject::WriteProperty, _id=<optimized out>, _a=0x7ffe76efb220) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/moc_client.cpp:277
#19 0x00007f1de049f0e2 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007f1de049cac6 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#21 0x00007f1de03e752b in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#22 0x00007f1de03e84ee in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#23 0x00007f1de03e8689 in QV4::QObjectWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#24 0x00007f1de0465229 in QV4::Runtime::method_storeProperty(QV4::ExecutionEngine*, QV4::Value const&, int, QV4::Value const&) () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#25 0x00007f1dc401bab9 in  ()
#26 0x0000000000000000 in  ()

Possible duplicates by query: bug 410345, bug 409515, bug 409231, bug 409110, bug 402911.

Reported using DrKonqi