Bug 421244

Application: kwin_x11 (5.18.5)

Qt Version: 5.14.2
Frameworks Version: 5.69.0
Operating System: Linux 5.3.0-51-generic x86_64
Windowing system: X11
Distribution: KDE neon User Edition 5.18

-- Information about the crash:
Closed and reopened laptop with thunderbolt monitor connected, crashed. Sometimes crashes just from unplugging and replugging monitor. Panel is placed in a random place on laptop screen in the middle, background goes black.

The crash can be reproduced every time.

-- 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 0x7fcde3620040 (LWP 11414))]

Thread 5 (Thread 0x7fcda5b89700 (LWP 11428)):
#0  0x00007fcde2f76cf6 in __GI_ppoll (fds=0x7fcda0000cf8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fcde01164e1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fcde0117ca2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fcde00b9d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fcddfeca757 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fcddab2efc5 in QQmlThreadPrivate::run() (this=0x5626bd6f6ea0) at qml/ftw/qqmlthread.cpp:155
#6  0x00007fcddfecbc2c in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fcddbf2d6db in start_thread (arg=0x7fcda5b89700) at pthread_create.c:463
#8  0x00007fcde2f8388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fcdaf514700 (LWP 11426)):
#0  0x00007fcddbf339f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5626bcbd5358) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007fcddbf339f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5626bcbd5308, cond=0x5626bcbd5330) at pthread_cond_wait.c:502
#2  0x00007fcddbf339f3 in __pthread_cond_wait (cond=0x5626bcbd5330, mutex=0x5626bcbd5308) at pthread_cond_wait.c:655
#3  0x00007fcdb022eecb in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fcdb022eac7 in  () at /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fcddbf2d6db in start_thread (arg=0x7fcdaf514700) at pthread_create.c:463
#6  0x00007fcde2f8388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fcdc1087700 (LWP 11423)):
#0  0x00007fcde2f76cf6 in __GI_ppoll (fds=0x7fcdb8000cf8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fcde01164e1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fcde0117ca2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fcde00b9d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fcddfeca757 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fcddab2efc5 in QQmlThreadPrivate::run() (this=0x5626bcb86360) at qml/ftw/qqmlthread.cpp:155
#6  0x00007fcddfecbc2c in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fcddbf2d6db in start_thread (arg=0x7fcdc1087700) at pthread_create.c:463
#8  0x00007fcde2f8388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fcdc3df5700 (LWP 11419)):
#0  0x00007fcde2f76cf6 in __GI_ppoll (fds=0x7fcdbc00f6c8, nfds=1, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fcde01164e1 in qt_safe_poll(pollfd*, unsigned long, timespec const*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fcde0117ca2 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fcde00b9d2a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fcddfeca757 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fcde1dc9555 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#6  0x00007fcddfecbc2c in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fcddbf2d6db in start_thread (arg=0x7fcdc3df5700) at pthread_create.c:463
#8  0x00007fcde2f8388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fcde3620040 (LWP 11414)):
[KCrash Handler]
#6  0x00007fcde2a74a75 in std::__atomic_base<int>::load(std::memory_order) const (__m=std::memory_order_relaxed, this=0x670076) at /usr/include/c++/7/bits/atomic_base.h:396
#7  0x00007fcde2a74a75 in QAtomicOps<int>::loadRelaxed<int>(std::atomic<int> const&) (_q_value=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qatomic_cxx11.h:239
#8  0x00007fcde2a74a75 in QBasicAtomicInteger<int>::loadRelaxed() const (this=0x670076) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qbasicatomic.h:107
#9  0x00007fcde2a74a75 in QtPrivate::RefCount::isShared() const (this=0x670076) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qrefcount.h:101
#10 0x00007fcde2a74a75 in QMap<KWin::Group*, KWin::Layer>::detach() (this=0x5626bd6bf2f0) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qmap.h:357
#11 0x00007fcde2a74a75 in QMap<KWin::Group*, KWin::Layer>::find(KWin::Group* const&) (akey=<optimized out>, this=0x5626bd6bf2f0) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qmap.h:877
#12 0x00007fcde2a74a75 in KWin::Workspace::constrainedStackingOrder() (this=this@entry=0x5626bcb11810) at ./layers.cpp:518
#13 0x00007fcde2a75568 in KWin::Workspace::updateStackingOrder(bool) (this=0x5626bcb11810, propagate_new_clients=propagate_new_clients@entry=false) at ./layers.cpp:122
#14 0x00007fcde2b46aec in KWin::X11Client::setFrameGeometry(int, int, int, int, KWin::AbstractClient::ForceGeometry_t) (this=0x5626bcc3fc40, x=<optimized out>, y=<optimized out>, w=<optimized out>, h=<optimized out>, force=KWin::AbstractClient::NormalGeometrySet) at ./x11client.cpp:4221
#15 0x00007fcde2b9e909 in KWin::AbstractClient::setFrameGeometry(QRect const&, KWin::AbstractClient::ForceGeometry_t) (force=KWin::AbstractClient::NormalGeometrySet, rect=..., this=0x5626bcc3fc40) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/../../../abstract_client.h:1335
#16 0x00007fcde2b9e909 in KWin::AbstractClient::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=_o@entry=0x5626bcc3fc40, _c=_c@entry=QMetaObject::WriteProperty, _id=_id@entry=27, _a=_a@entry=0x7ffe59a74290) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/moc_abstract_client.cpp:812
#17 0x00007fcde2ba44c3 in KWin::AbstractClient::qt_metacall(QMetaObject::Call, int, void**) (this=this@entry=0x5626bcc3fc40, _c=_c@entry=QMetaObject::WriteProperty, _id=27, _a=_a@entry=0x7ffe59a74290) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/moc_abstract_client.cpp:861
#18 0x00007fcde2ba4535 in KWin::X11Client::qt_metacall(QMetaObject::Call, int, void**) (this=0x5626bcc3fc40, _c=QMetaObject::WriteProperty, _id=<optimized out>, _a=0x7ffe59a74290) at ./obj-x86_64-linux-gnu/kwin_autogen/EWIEGA46WW/moc_x11client.cpp:278
#19 0x00007fcddaa8a2c2 in QQmlPropertyData::writeProperty(QObject*, void*, QFlags<QQmlPropertyData::WriteFlag>) const (this=this@entry=0x5626bd9ecda8, target=target@entry=0x5626bcc3fc40, value=<optimized out>, flags=...) at ../../include/QtQml/5.14.2/QtQml/private/../../../../../src/qml/qml/qqmlpropertydata_p.h:290
#20 0x00007fcddaa888c7 in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlContextData*, QFlags<QQmlPropertyData::WriteFlag>) (object=0x5626bcc3fc40, property=..., value=..., context=0x5626bd8fd310, flags=...) at qml/qqmlproperty.cpp:1301
#21 0x00007fcdda9bcc33 in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData*, QV4::Value const&) (engine=engine@entry=0x5626bcc368e0, object=object@entry=0x5626bcc3fc40, property=0x5626bd9ecda8, value=...) at jsruntime/qv4qobjectwrapper.cpp:565
#22 0x00007fcdda9bdb4e in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlContextData*, QObject*, QV4::String*, QV4::QObjectWrapper::RevisionMode, QV4::Value const&) (engine=0x5626bcc368e0, qmlContext=<optimized out>, object=0x5626bcc3fc40, name=<optimized out>, revisionMode=QV4::QObjectWrapper::IgnoreRevision, value=...) at jsruntime/qv4qobjectwrapper.cpp:435
#23 0x00007fcdda9bdc9b in QV4::QObjectWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) (m=0x7fcda4f4ab58, id=..., value=..., receiver=0x7fcda4f4ab58) at jsruntime/qv4qobjectwrapper.cpp:721
#24 0x00007fcdda93eaa8 in QV4::Object::put(QV4::StringOrSymbol*, QV4::Value const&, QV4::Value*) (receiver=0x7fcda4f4ab58, v=..., name=0x7fcda4f4ab60, this=0x7fcda4f4ab60) at jsruntime/qv4object_p.h:318
#25 0x00007fcdda93eaa8 in QV4::Lookup::setterFallback(QV4::Lookup*, QV4::ExecutionEngine*, QV4::Value&, QV4::Value const&) (l=<optimized out>, engine=0x5626bcc368e0, object=..., value=...) at jsruntime/qv4lookup.cpp:497
#26 0x00007fcdda9e9d0a in QV4::Runtime::SetLookupStrict::call(QV4::Function*, QV4::Value const&, int, QV4::Value const&) (f=<optimized out>, base=..., index=<optimized out>, value=...) at jsruntime/qv4runtime.cpp:1128
#27 0x00007fcdac1b5211 in  ()
#28 0x0000000000000000 in  ()

The reporter indicates this bug may be a duplicate of or related to bug 412178.

Possible duplicates by query: bug 420495, bug 417807, bug 417542, bug 414147, bug 413706.

Reported using DrKonqi