Bug 421297

Application: kwin_x11 (5.18.5)

Qt Version: 5.14.1
Frameworks Version: 5.69.0
Operating System: Linux 5.6.11-1-default x86_64
Windowing system: X11
Distribution: "openSUSE Tumbleweed"

-- Information about the crash:
- What I was doing when the application crashed:
I was downloading some torrents and QtTransmission was sending notifications that torrents have been added.

- Custom settings of the application:
KWin + the KWin Tiling Script v2.4.0 + Latte Dock

The crash can be reproduced sometimes.

-- Backtrace:
Application: KWin (kwin_x11), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f5f8d323800 (LWP 3134))]

Thread 9 (Thread 0x7f5f7b1fe700 (LWP 3470)):
#0  0x00007f5f9032f795 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f5f908021ea in  () at /usr/lib64/libQt5Script.so.5
#2  0x00007f5f9080220b in  () at /usr/lib64/libQt5Script.so.5
#3  0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#4  0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 8 (Thread 0x7f5f73fff700 (LWP 3450)):
#0  0x00007f5f9032f795 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f5f7a1bf81b in  () at /usr/lib64/dri/i965_dri.so
#2  0x00007f5f7a1bf697 in  () at /usr/lib64/dri/i965_dri.so
#3  0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#4  0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 7 (Thread 0x7f5f78b3d700 (LWP 3449)):
#0  0x00007f5f9032f795 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f5f7a1bf81b in  () at /usr/lib64/dri/i965_dri.so
#2  0x00007f5f7a1bf697 in  () at /usr/lib64/dri/i965_dri.so
#3  0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#4  0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 6 (Thread 0x7f5f7933e700 (LWP 3448)):
#0  0x00007f5f9032f795 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f5f7a1bf81b in  () at /usr/lib64/dri/i965_dri.so
#2  0x00007f5f7a1bf697 in  () at /usr/lib64/dri/i965_dri.so
#3  0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#4  0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 5 (Thread 0x7f5f79b3f700 (LWP 3447)):
#0  0x00007f5f9032f795 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f5f7a1bf81b in  () at /usr/lib64/dri/i965_dri.so
#2  0x00007f5f7a1bf697 in  () at /usr/lib64/dri/i965_dri.so
#3  0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#4  0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 4 (Thread 0x7f5f7bfff700 (LWP 3442)):
#0  0x00007f5f9254bbc6 in ppoll () at /lib64/libc.so.6
#1  0x00007f5f90f12c59 in ppoll (__ss=<optimized out>, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2  0x00007f5f90f12c59 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f5f74000d38) at kernel/qcore_unix.cpp:132
#3  0x00007f5f90f12c59 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f5f74000d38) at kernel/qcore_unix.cpp:129
#4  0x00007f5f90f12c59 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7f5f74000d38, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:155
#5  0x00007f5f90f14263 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at ../../include/QtCore/../../src/corelib/tools/qarraydata.h:211
#6  0x00007f5f90ebeb7b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f5f7bffed80, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#7  0x00007f5f90ce95ce in QThread::exec() (this=this@entry=0x55a5cbc9c430) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#8  0x00007f5f8fa626e5 in QQmlThreadPrivate::run() (this=0x55a5cbc9c430) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/qml/ftw/qqmlthread.cpp:155
#9  0x00007f5f90cea698 in QThreadPrivate::start(void*) (arg=0x55a5cbc9c430) at thread/qthread_unix.cpp:342
#10 0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#11 0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 3 (Thread 0x7f5f8a5e1700 (LWP 3182)):
#0  0x00007f5f9254bbc6 in ppoll () at /lib64/libc.so.6
#1  0x00007f5f90f12c59 in ppoll (__ss=<optimized out>, __timeout=<optimized out>, __nfds=<optimized out>, __fds=<optimized out>) at /usr/include/bits/poll2.h:77
#2  0x00007f5f90f12c59 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f5f7c00b088) at kernel/qcore_unix.cpp:132
#3  0x00007f5f90f12c59 in qt_ppoll (timeout_ts=0x0, nfds=1, fds=0x7f5f7c00b088) at kernel/qcore_unix.cpp:129
#4  0x00007f5f90f12c59 in qt_safe_poll(pollfd*, unsigned long, timespec const*) (fds=0x7f5f7c00b088, nfds=1, timeout_ts=timeout_ts@entry=0x0) at kernel/qcore_unix.cpp:155
#5  0x00007f5f90f14263 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...) at ../../include/QtCore/../../src/corelib/tools/qarraydata.h:211
#6  0x00007f5f90ebeb7b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f5f8a5e0d70, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#7  0x00007f5f90ce95ce in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#8  0x00007f5f91ff7507 in  () at /usr/lib64/libQt5DBus.so.5
#9  0x00007f5f90cea698 in QThreadPrivate::start(void*) (arg=0x7f5f92079da0) at thread/qthread_unix.cpp:342
#10 0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#11 0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7f5f8b2b4700 (LWP 3151)):
#0  0x00007f5f9254bacf in poll () at /lib64/libc.so.6
#1  0x00007f5f90c07772 in  () at /usr/lib64/libxcb.so.1
#2  0x00007f5f90c0843a in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007f5f8b40dab0 in QXcbEventQueue::run() (this=0x55a5cb996e30) at qxcbeventqueue.cpp:228
#4  0x00007f5f90cea698 in QThreadPrivate::start(void*) (arg=0x55a5cb996e30) at thread/qthread_unix.cpp:342
#5  0x00007f5f90328efa in start_thread () at /lib64/libpthread.so.0
#6  0x00007f5f925563bf in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f5f8d323800 (LWP 3134)):
[KCrash Handler]
#6  0x00007f5f8f7d9cb2 in QV4::Heap::Base::mark(QV4::MarkStack*) (markStack=0x7ffcf2d0c680, this=0x7f5f88161588) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/memory/qv4heap_p.h:190
#7  0x00007f5f8f7d9cb2 in QV4::Managed::mark(QV4::MarkStack*) (markStack=0x7ffcf2d0c680, this=0x7f5f88161598) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4managed_p.h:204
#8  0x00007f5f8f7d9cb2 in QV4::MemoryManager::collectFromJSStack(QV4::MarkStack*) const (this=this@entry=0x55a5cbc98a60, markStack=markStack@entry=0x7ffcf2d0c680) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/memory/qv4mm.cpp:1221
#9  0x00007f5f8f7d9d3c in QV4::MemoryManager::collectRoots(QV4::MarkStack*) (this=this@entry=0x55a5cbc98a60, markStack=markStack@entry=0x7ffcf2d0c680) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/memory/qv4mm.cpp:873
#10 0x00007f5f8f7d9f3d in QV4::MemoryManager::mark() (this=this@entry=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/memory/qv4mm.cpp:917
#11 0x00007f5f8f7dba16 in QV4::MemoryManager::runGC() (this=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/memory/qv4mm.cpp:1052
#12 0x00007f5f8f7ddce8 in QV4::MemoryManager::allocate(QV4::BlockAllocator*, unsigned long) (size=64, allocator=0x55a5cbc98a70, this=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/memory/qv4mm_p.h:328
#13 0x00007f5f8f7ddce8 in QV4::MemoryManager::allocData(unsigned long) (this=0x55a5cbc98a60, size=64) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/memory/qv4mm.cpp:802
#14 0x00007f5f8f7dddef in QV4::MemoryManager::allocObjectWithMemberData(QV4::VTable const*, unsigned int) (this=this@entry=0x55a5cbc98a60, vtable=vtable@entry=0x7f5f8fba43e0 <QV4::ArrayBuffer::static_vtbl>, nMembers=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/memory/qv4mm.cpp:814
#15 0x00007f5f8f84d5e2 in QV4::MemoryManager::allocateObject<QV4::ArrayBuffer>(QV4::Heap::InternalClass*) (ic=0x7f5f7b25b300, this=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4arraybuffer_p.h:137
#16 0x00007f5f8f84d5e2 in QV4::MemoryManager::allocateObject<QV4::ArrayBuffer>(QV4::InternalClass*) (ic=0x7f5f88161778, this=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/memory/qv4mm_p.h:201
#17 0x00007f5f8f84d5e2 in QV4::MemoryManager::allocateObject<QV4::ArrayBuffer>() (this=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/memory/qv4mm_p.h:211
#18 0x00007f5f8f84d5e2 in QV4::MemoryManager::allocate<QV4::ArrayBuffer, QByteArray>(QByteArray) (this=0x55a5cbc98a60) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/memory/qv4mm_p.h:244
#19 0x00007f5f8f84d5e2 in QV4::ExecutionEngine::newArrayBuffer(QByteArray const&) (this=<optimized out>, array=...) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4engine.cpp:968
#20 0x00007f5f8f84fa3d in QV4::ExecutionEngine::fromVariant(QVariant const&) (this=this@entry=0x55a5cbe45580, variant=...) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4engine.cpp:1645
#21 0x00007f5f8f8d8c4f in loadProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData const&) (v4=0x55a5cbe45580, object=0x55a5cc81bcf0, property=...) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4qobjectwrapper.cpp:205
#22 0x00007f5f8f8d93ce in QV4::QObjectWrapper::getQmlProperty(QQmlContextData*, QV4::String*, QV4::QObjectWrapper::RevisionMode, bool*, bool) const (includeImports=true, hasProperty=0x0, revisionMode=QV4::QObjectWrapper::IgnoreRevision, name=0x7f5f88161768, qmlContext=0x55a5cc4224e0, this=0x7f5f88161760) at /usr/include/c++/9/bits/atomic_base.h:413
#23 0x00007f5f8f8d93ce in QV4::QObjectWrapper::getQmlProperty(QQmlContextData*, QV4::String*, QV4::QObjectWrapper::RevisionMode, bool*, bool) const (this=0x7f5f88161760, qmlContext=0x55a5cc4224e0, name=0x7f5f88161768, revisionMode=QV4::QObjectWrapper::IgnoreRevision, hasProperty=0x0, includeImports=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4qobjectwrapper.cpp:314
#24 0x00007f5f8f8d958c in QV4::QObjectWrapper::virtualGet(QV4::Managed const*, QV4::PropertyKey, QV4::Value const*, bool*) (m=0x7f5f88161760, id=..., receiver=<optimized out>, hasProperty=0x0) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/common/qv4staticvalue_p.h:325
#25 0x00007f5f8f90c985 in QV4::Object::get(QV4::StringOrSymbol*, bool*, QV4::Value const*) const (receiver=<optimized out>, hasProperty=0x0, name=0x7f5f88161758, this=0x7f5f88161760) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/include/QtQml/5.14.1/QtQml/private/../../../../../src/qml/jsruntime/qv4string_p.h:167
#26 0x00007f5f8f90c985 in QV4::Runtime::LoadProperty::call(QV4::ExecutionEngine*, QV4::Value const&, int) (engine=0x55a5cbe45580, object=..., nameIndex=<optimized out>) at /usr/src/debug/libqt5-qtdeclarative-5.14.1-1.3.x86_64/src/qml/jsruntime/qv4runtime.cpp:1018
#27 0x00007f5f7803da24 in  ()
#28 0x0000000000000000 in  ()
[Inferior 1 (process 3134) detached]

Possible duplicates by query: bug 416826.

Reported using DrKonqi