Application: plasma-discover (5.12.4)

Qt Version: 5.10.1
Frameworks Version: 5.44.0
Operating System: Linux 4.16.5-300.fc28.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
- What I was doing when the application crashed:
I was trying to view the discover app settings. Once I clicked the settings, the application crashed.

- Custom settings of the application:
The rpmfusion-nonfree repository is configured and enabled.

I should add that the problem seems deeper than being related to discover alone. Upon trying to run the following command from the shell

sudo pkcon refresh force

I always get the following error at the end:

Fatal error: Error when getting information for file “/var/cache/PackageKit/28/metadata/rpmfusion-nonfree/repodata/appstream.xml.gz”: No such file or directory

At one time one I issue the `pkcon refresh' command it didn't spit out the error message. Consequently discover app didn't crash ever since.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fccb5f54940 (LWP 13047))]

Thread 11 (Thread 0x7fcc79b8c700 (LWP 13058)):
#0  0x00007fccbe0938e8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fccc0d7c736 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fccc0d79662 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#3  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#4  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7fcc7a38d700 (LWP 13057)):
#0  0x00007fccc00aa374 in read () from /lib64/libc.so.6
#1  0x00007fccb9183dd0 in g_wakeup_acknowledge () from /lib64/libglib-2.0.so.0
#2  0x00007fccb913e5fb in g_main_context_check () from /lib64/libglib-2.0.so.0
#3  0x00007fccb913eab0 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#4  0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#5  0x00007fccc0f7ac2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#7  0x00007fccc0d779c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#8  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#10 0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fcc7ab8e700 (LWP 13056)):
#0  0x00007fccbe0938e8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fccc0d7c736 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fccc0d79662 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#3  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#4  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fcc7b38f700 (LWP 13055)):
#0  0x00007fccbe0938e8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007fccc0d7c736 in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#2  0x00007fccc0d79662 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#3  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#4  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fcc7bb90700 (LWP 13054)):
#0  0x00007fccb91851ed in g_mutex_lock () from /lib64/libglib-2.0.so.0
#1  0x00007fccb913e235 in g_main_context_query () from /lib64/libglib-2.0.so.0
#2  0x00007fccb913ea87 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007fccc0f7ac2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fccc0d779c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#9  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fcc81498700 (LWP 13052)):
#0  0x00007fccb91851ed in g_mutex_lock () from /lib64/libglib-2.0.so.0
#1  0x00007fccb913e056 in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#2  0x00007fccb913ea3b in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007fccc0f7ac2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fccc0d779c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#9  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fcc8f5b4700 (LWP 13051)):
#0  0x00007fccc00aa374 in read () from /lib64/libc.so.6
#1  0x00007fccb9183dd0 in g_wakeup_acknowledge () from /lib64/libglib-2.0.so.0
#2  0x00007fccb913e5fb in g_main_context_check () from /lib64/libglib-2.0.so.0
#3  0x00007fccb913eab0 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#4  0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#5  0x00007fccc0f7ac2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#7  0x00007fccc0d779c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#8  0x00007fccc46fda1a in QQuickPixmapReader::run() () from /lib64/libQt5Quick.so.5
#9  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#10 0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#11 0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fcc9d0cc700 (LWP 13050)):
#0  0x00007fccb9185218 in g_mutex_unlock () from /lib64/libglib-2.0.so.0
#1  0x00007fccb913e2e3 in g_main_context_query () from /lib64/libglib-2.0.so.0
#2  0x00007fccb913ea87 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#3  0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#4  0x00007fccc0f7ac2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#6  0x00007fccc0d779c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#7  0x00007fccc18f2339 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#8  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#9  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#10 0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fcc9e2dd700 (LWP 13049)):
#0  0x00007fccc00ae929 in poll () from /lib64/libc.so.6
#1  0x00007fccb913eb06 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#2  0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007fccc0f7ac2b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007fccc0d779c6 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007fccc5306299 in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#7  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#9  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fcca6c86700 (LWP 13048)):
#0  0x00007fccc00ae929 in poll () from /lib64/libc.so.6
#1  0x00007fccb8ac404f in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007fccb8ac5caa in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007fcca96344d9 in QXcbEventReader::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007fccc0d7c11d in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007fccbe08d564 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fccc00b931f in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fccb5f54940 (LWP 13047)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007fccc191c816 in QQmlDelegateModelAttachedMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () from /lib64/libQt5Qml.so.5
#8  0x00007fccc4392bc0 in AbstractResourcesBackend::Filters::shouldFilter(AbstractResource*) const () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#9  0x00007fccc4392f6b in AbstractResourcesBackend::Filters::filterJustInCase(QVector<AbstractResource*>&) const () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#10 0x00007fccc438a446 in ResourcesProxyModel::addResources(QVector<AbstractResource*> const&) () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#11 0x00007fccc0f52de3 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#12 0x00007fccc43a3636 in ResultsStream::resourcesFound(QVector<AbstractResource*> const&) () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#13 0x00007fccc43826dc in AggregatedResultsStream::emitResults() () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#14 0x00007fccc4382719 in AggregatedResultsStream::clear() () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#15 0x00007fccc4383ab7 in AggregatedResultsStream::destruction(QObject*) () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#16 0x00007fccc0f52de3 in QMetaObject::activate(QObject*, int, int, void**) () from /lib64/libQt5Core.so.5
#17 0x00007fccc0f53413 in QObject::destroyed(QObject*) () from /lib64/libQt5Core.so.5
#18 0x00007fccc0f5a44f in QObject::~QObject() () from /lib64/libQt5Core.so.5
#19 0x00007fccc439279d in ResultsStream::~ResultsStream() () from /usr/lib64/plasma-discover/libDiscoverCommon.so
#20 0x00007fccc0f53a48 in QObject::event(QEvent*) () from /lib64/libQt5Core.so.5
#21 0x00007fccc2082e95 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#22 0x00007fccc208a83a in QApplication::notify(QObject*, QEvent*) () from /lib64/libQt5Widgets.so.5
#23 0x00007fccc0f2a376 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib64/libQt5Core.so.5
#24 0x00007fccc0f2d09b in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib64/libQt5Core.so.5
#25 0x00007fccc0f7aec7 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5Core.so.5
#26 0x00007fccb913e7cd in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#27 0x00007fccb913eb98 in g_main_context_iterate.isra () from /lib64/libglib-2.0.so.0
#28 0x00007fccb913ec30 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#29 0x00007fccc0f7ac13 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#30 0x00007fcca96c2065 in QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5XcbQpa.so.5
#31 0x00007fccc0f2912b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#32 0x00007fccc0f315b6 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#33 0x00005651f5ac9e47 in main ()

Reported using DrKonqi