Bug 417478

Application: plasma-discover (5.17.90)

Qt Version: 5.12.5
Frameworks Version: 5.67.0
Operating System: Linux 5.3.0-18-generic x86_64
Windowing system: X11
Distribution: Ubuntu Focal Fossa (development branch)

-- Information about the crash:
I just cannot open plasma-dicover, and each time I tried to open it, it would crash. After that the system reported a crashing to me.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5645b23b38f4) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
[Current thread is 1 (Thread 0x7f0656649f40 (LWP 5669))]

Thread 4 (Thread 0x7f064edee700 (LWP 5672)):
[KCrash Handler]
#6  0x00007f065ab335b0 in QString::operator=(QString const&) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f065b0cc1d0 in QV4::CompiledData::CompilationUnit::setUnitData(QV4::CompiledData::Unit const*, QV4::CompiledData::QmlUnit const*, QString const&, QString const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f065b0cf392 in QV4::CompiledData::CompilationUnit::loadFromDisk(QUrl const&, QDateTime const&, QString*) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f065b2b812a in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f065b2ba383 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f065b2b2f22 in QQmlTypeLoader::setData(QQmlDataBlob*, QQmlDataBlob::SourceCodeData const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00007f065b2b384d in QQmlTypeLoader::setData(QQmlDataBlob*, QString const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#13 0x00007f065b2b397d in QQmlTypeLoader::loadThread(QQmlDataBlob*) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#14 0x00007f065b2c192c in void QQmlTypeLoader::doLoad<PlainLoader>(PlainLoader const&, QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#15 0x00007f065b2b3bea in QQmlTypeLoader::load(QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#16 0x00007f065b2b4958 in QQmlTypeLoader::getType(QUrl const&, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007f065b2b5365 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#18 0x00007f065b2b5828 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007f065b2b301a in QQmlTypeLoader::setData(QQmlDataBlob*, QQmlDataBlob::SourceCodeData const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007f065b2b384d in QQmlTypeLoader::setData(QQmlDataBlob*, QString const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#21 0x00007f065b2b397d in QQmlTypeLoader::loadThread(QQmlDataBlob*) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#22 0x00007f065b2c192c in void QQmlTypeLoader::doLoad<PlainLoader>(PlainLoader const&, QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#23 0x00007f065b2b3bea in QQmlTypeLoader::load(QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#24 0x00007f065b2b4958 in QQmlTypeLoader::getType(QUrl const&, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#25 0x00007f065b2b5365 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x00007f065b2b5828 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#27 0x00007f065b2b301a in QQmlTypeLoader::setData(QQmlDataBlob*, QQmlDataBlob::SourceCodeData const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#28 0x00007f065b2b384d in QQmlTypeLoader::setData(QQmlDataBlob*, QString const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#29 0x00007f065b2b397d in QQmlTypeLoader::loadThread(QQmlDataBlob*) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#30 0x00007f065b2c192c in void QQmlTypeLoader::doLoad<PlainLoader>(PlainLoader const&, QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#31 0x00007f065b2b3bea in QQmlTypeLoader::load(QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#32 0x00007f065b2b4958 in QQmlTypeLoader::getType(QUrl const&, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#33 0x00007f065b2b5365 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#34 0x00007f065b2b5828 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#35 0x00007f065b2b301a in QQmlTypeLoader::setData(QQmlDataBlob*, QQmlDataBlob::SourceCodeData const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#36 0x00007f065b2b384d in QQmlTypeLoader::setData(QQmlDataBlob*, QString const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#37 0x00007f065b2b397d in QQmlTypeLoader::loadThread(QQmlDataBlob*) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#38 0x00007f065b2b3b81 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#39 0x00007f065b32a79c in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#40 0x00007f065b32aeda in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#41 0x00007f065bc17a66 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#42 0x00007f065bc210e0 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#43 0x00007f065ac79cca in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007f065ac7c948 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007f065acd22e7 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#46 0x00007f0659242ecd in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#47 0x00007f0659243150 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#48 0x00007f06592431f3 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#49 0x00007f065acd18e5 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007f065ac7886b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#51 0x00007f065aab17b5 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#52 0x00007f065b32a469 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#53 0x00007f065aab2a02 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#54 0x00007f0659ac8669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#55 0x00007f065a742333 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f064ffff700 (LWP 5671)):
#0  0x00007f065928fd68 in g_mutex_unlock () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f06592430b3 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f06592431f3 in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f065acd1903 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f065ac7886b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f065aab17b5 in QThread::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f065c15fefa in  () at /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f065aab2a02 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f0659ac8669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f065a742333 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f0655394700 (LWP 5670)):
#0  0x00007f065a735c3f in __GI___poll (fds=0x7f0655393ba8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f0659135c1a in  () at /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f065913787a in xcb_wait_for_event () at /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f0655b921a8 in  () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f065aab2a02 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f0659ac8669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f065a742333 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f0656649f40 (LWP 5669)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5645b23b38f4) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x5645b23b38a0, cond=0x5645b23b38c8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x5645b23b38c8, mutex=0x5645b23b38a0) at pthread_cond_wait.c:638
#3  0x00007f065aab8b3f in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f065aab8c31 in QWaitCondition::wait(QMutex*, unsigned long) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f065b32ab77 in  () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007f065b2c18d5 in void QQmlTypeLoader::doLoad<PlainLoader>(PlainLoader const&, QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f065b2b3bea in QQmlTypeLoader::load(QQmlDataBlob*, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f065b2b4958 in QQmlTypeLoader::getType(QUrl const&, QQmlTypeLoader::Mode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f065b28bf8d in QQmlComponentPrivate::loadUrl(QUrl const&, QQmlComponent::CompilationMode) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f065b30021b in QQmlApplicationEnginePrivate::startLoad(QUrl const&, QByteArray const&, bool) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f065b300271 in QQmlApplicationEngine::load(QUrl const&) () at /lib/x86_64-linux-gnu/libQt5Qml.so.5
#12 0x00005645b0d8cc83 in  ()
#13 0x00005645b0d7f2e4 in  ()
#14 0x00007f065a6471e3 in __libc_start_main (main=0x5645b0d7ece0, argc=3, argv=0x7fff9f01a6f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff9f01a6e8) at ../csu/libc-start.c:308
#15 0x00005645b0d7faee in _start ()
[Inferior 1 (process 5669) detached]

Possible duplicates by query: bug 414147, bug 413706, bug 413301, bug 409898, bug 409110.

Reported using DrKonqi