Bug 418649

Summary: Plasma discover crashes after opening. Fedora 32
Product: [Applications] Discover Reporter: Aaron <aaronuk5>
Component: discoverAssignee: Dan Leinir Turthra Jensen <leinir>
Status: RESOLVED UPSTREAM    
Severity: crash CC: aleixpol, matthias
Priority: NOR Keywords: drkonqi
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Aaron 2020-03-09 00:09:10 UTC 
Application: plasma-discover (5.18.2)

Qt Version: 5.13.2
Frameworks Version: 5.67.0
Operating System: Linux 5.6.0-0.rc4.git0.1.fc32.x86_64 x86_64
Windowing system: X11
Distribution: Fedora 32 (KDE Plasma)

-- Information about the crash:
plasma-discover 
qrc:/qml/Feedback.qml:2:1: module "org.kde.userfeedback" is not installed
invalid kns backend! "/usr/share/knsrcfiles/ksysguard.knsrc" because: "Config group not found! Check your KNS3 installation."
adding empty sources model QStandardItemModel(0x55f1ac33aff0)
org.kde.plasma.discover: couldn't open file "/home/.cache/discover/featured-5.9.json" "No such file or directory"
org.kde.plasma.discover: couldn't open file "/home/.cache/discover/featured-5.9.json" "No such file or directory"
org.kde.plasma.discover: couldn't open file "/home/.cache/discover/featured-5.9.json" "No such file or directory"
org.kde.plasma.libdiscover: Couldn't find a category for  "fwupd-backend"
free(): double free detected in tcache 2
KCrash: Application 'plasma-discover' crashing...
KCrash: Attempting to start /usr/libexec/drkonqi from kdeinit
sock_file=/run/user/1000/kdeinit5__0

[1]+  Stopped                 plasma-discover
[@Lenovo ~]$ QSocketNotifier: Invalid socket 8 and type 'Read', disabling...
QSocketNotifier: Invalid socket 22 and type 'Read', disabling...

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Aborted
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f44974e0dc0 (LWP 4361))]

Thread 27 (Thread 0x7f43fdffb700 (LWP 4390)):
#0  0x00007f449a8681c8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f449b7684d9 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib64/libQt5Core.so.5
#2  0x00007f449b7685fb in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#3  0x00007f449b7665e3 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#4  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 26 (Thread 0x7f43fe7fc700 (LWP 4389)):
#0  0x00007f449a8681c8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f449b7684d9 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib64/libQt5Core.so.5
#2  0x00007f449b7685fb in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#3  0x00007f449b7665e3 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#4  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 25 (Thread 0x7f43feffd700 (LWP 4388)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#7  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 24 (Thread 0x7f43ff7fe700 (LWP 4387)):
#0  0x00007fff927c7ac5 in clock_gettime ()
#1  0x00007f449b3b06b5 in clock_gettime@GLIBC_2.2.5 () from /lib64/libc.so.6
#2  0x00007f449b938415 in qt_gettime() () from /lib64/libQt5Core.so.5
#3  0x00007f449b936d5d in QTimerInfoList::updateCurrentTime() () from /lib64/libQt5Core.so.5
#4  0x00007f449b938eb5 in timerSourceCheck(_GSource*) () from /lib64/libQt5Core.so.5
#5  0x00007f4499f19499 in g_main_context_check () from /lib64/libglib-2.0.so.0
#6  0x00007f4499f19a33 in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#7  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#8  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#9  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#10 0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#11 0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#12 0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 23 (Thread 0x7f43fffff700 (LWP 4386)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f4470040654 in FwupdBackend::downloadFile(QUrl const&, QString const&) () from /usr/lib64/qt5/plugins/discover/fwupd-backend.so
#6  0x00007f4470040b07 in FwupdBackend::refreshRemote(FwupdBackend*, _FwupdRemote*, unsigned long long, _GCancellable*) () from /usr/lib64/qt5/plugins/discover/fwupd-backend.so
#7  0x00007f447004276a in QtConcurrent::RunFunctionTask<_GPtrArray*>::run() () from /usr/lib64/qt5/plugins/discover/fwupd-backend.so
#8  0x00007f449b7663da in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#9  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#10 0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 22 (Thread 0x7f4440bf7700 (LWP 4384)):
[KCrash Handler]
#6  0x00007f449b324a35 in raise () from /lib64/libc.so.6
#7  0x00007f449b30d895 in abort () from /lib64/libc.so.6
#8  0x00007f449b368887 in __libc_message () from /lib64/libc.so.6
#9  0x00007f449b36fdbc in malloc_printerr () from /lib64/libc.so.6
#10 0x00007f449b3713cd in _int_free () from /lib64/libc.so.6
#11 0x00007f4499f1f98d in g_free () from /lib64/libglib-2.0.so.0
#12 0x00007f4499a2dc54 in as_xml_dump_node_content () from /lib64/libappstream.so.4
#13 0x00007f4499a2e019 in as_xml_parse_metainfo_description_node () from /lib64/libappstream.so.4
#14 0x00007f4499a4e100 in as_release_load_from_xml () from /lib64/libappstream.so.4
#15 0x00007f4499a41492 in as_component_load_from_xml () from /lib64/libappstream.so.4
#16 0x00007f4499a3b587 in as_metadata_parse () from /lib64/libappstream.so.4
#17 0x00007f4499a3ba4d in as_metadata_parse_file () from /lib64/libappstream.so.4
#18 0x00007f4499a48daa in as_pool_load () from /lib64/libappstream.so.4
#19 0x00007f449ad7150d in AppStream::Pool::load() () from /lib64/libAppStreamQt.so.2
#20 0x00007f449ad715d3 in AppStream::Pool::load(QString*) () from /lib64/libAppStreamQt.so.2
#21 0x00007f445828bcb1 in loadAppStream(AppStream::Pool*) () from /usr/lib64/qt5/plugins/discover/packagekit-backend.so
#22 0x00007f445829588e in QtConcurrent::RunFunctionTask<DelayedAppStreamLoad>::run() () from /usr/lib64/qt5/plugins/discover/packagekit-backend.so
#23 0x00007f449b7663da in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#24 0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#25 0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#26 0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 21 (Thread 0x7f44417fa700 (LWP 4383)):
#0  0x00007f449a8681c8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f449b7684d9 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib64/libQt5Core.so.5
#2  0x00007f449b7685fb in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#3  0x00007f449b7665e3 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#4  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 20 (Thread 0x7f4441ffb700 (LWP 4382)):
#0  0x00007f449a8681c8 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f449b7684d9 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib64/libQt5Core.so.5
#2  0x00007f449b7685fb in QWaitCondition::wait(QMutex*, unsigned long) () from /lib64/libQt5Core.so.5
#3  0x00007f449b7665e3 in QThreadPoolThread::run() () from /lib64/libQt5Core.so.5
#4  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 19 (Thread 0x7f44427fc700 (LWP 4381)):
#0  0x00007fff927c7ac5 in clock_gettime ()
#1  0x00007f449b3b06b5 in clock_gettime@GLIBC_2.2.5 () from /lib64/libc.so.6
#2  0x00007f449b938415 in qt_gettime() () from /lib64/libQt5Core.so.5
#3  0x00007f449b936d5d in QTimerInfoList::updateCurrentTime() () from /lib64/libQt5Core.so.5
#4  0x00007f449b9371a9 in QTimerInfoList::timerWait(timespec&) () from /lib64/libQt5Core.so.5
#5  0x00007f449b9388be in timerSourcePrepare(_GSource*, int*) () from /lib64/libQt5Core.so.5
#6  0x00007f4499f18fba in g_main_context_prepare () from /lib64/libglib-2.0.so.0
#7  0x00007f4499f199bb in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#8  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#9  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#10 0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#11 0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#12 0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#13 0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#14 0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 18 (Thread 0x7f4442ffd700 (LWP 4380)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#7  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 17 (Thread 0x7f44437fe700 (LWP 4379)):
#0  0x00007f449b36f0b3 in __libc_enable_asynccancel () from /lib64/libc.so.6
#1  0x00007f449b3de9b7 in poll () from /lib64/libc.so.6
#2  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#3  0x00007f4499f19e0b in g_main_loop_run () from /lib64/libglib-2.0.so.0
#4  0x00007f44998f078a in gdbus_shared_thread_func () from /lib64/libgio-2.0.so.0
#5  0x00007f4499f43652 in g_thread_proxy () from /lib64/libglib-2.0.so.0
#6  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#7  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 16 (Thread 0x7f4443fff700 (LWP 4378)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f4499f19c11 in glib_worker_main () from /lib64/libglib-2.0.so.0
#4  0x00007f4499f43652 in g_thread_proxy () from /lib64/libglib-2.0.so.0
#5  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 15 (Thread 0x7f4459ffb700 (LWP 4377)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f449d12011a in QQuickPixmapReader::run() () from /lib64/libQt5Quick.so.5
#7  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7f445a7fc700 (LWP 4374)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 13 (Thread 0x7f445affd700 (LWP 4373)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7f445b7fe700 (LWP 4372)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7f445bfff700 (LWP 4371)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7f4470a88700 (LWP 4370)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7f4471289700 (LWP 4369)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7f4471a8a700 (LWP 4368)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7f447228b700 (LWP 4367)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f4472a8c700 (LWP 4366)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7f4480f37700 (LWP 4365)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f448183c4db in util_queue_thread_func () from /usr/lib64/dri/radeonsi_dri.so
#2  0x00007f448183bfbb in impl_thrd_routine () from /usr/lib64/dri/radeonsi_dri.so
#3  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#4  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f4483fff700 (LWP 4364)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f449bf34d89 in QQmlThreadPrivate::run() () from /lib64/libQt5Qml.so.5
#7  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f44892ac700 (LWP 4363)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499f19a8d in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f449b938b93 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#4  0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#5  0x00007f449b7616e7 in QThread::exec() () from /lib64/libQt5Core.so.5
#6  0x00007f449cc734da in QDBusConnectionManager::run() () from /lib64/libQt5DBus.so.5
#7  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#8  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f448a1d1700 (LWP 4362)):
#0  0x00007f449b3de9cf in poll () from /lib64/libc.so.6
#1  0x00007f4499e1338a in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007f4499e1571a in xcb_wait_for_event () from /lib64/libxcb.so.1
#3  0x00007f448a3d5cc8 in QXcbEventQueue::run() () from /lib64/libQt5XcbQpa.so.5
#4  0x00007f449b7629b6 in QThreadPrivate::start(void*) () from /lib64/libQt5Core.so.5
#5  0x00007f449a861432 in start_thread () from /lib64/libpthread.so.0
#6  0x00007f449b3e9833 in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f44974e0dc0 (LWP 4361)):
#0  0x00007f449a867ea2 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f4499e1357f in _xcb_conn_wait () from /lib64/libxcb.so.1
#2  0x00007f4499e1542f in wait_for_reply () from /lib64/libxcb.so.1
#3  0x00007f4499e15545 in xcb_wait_for_reply () from /lib64/libxcb.so.1
#4  0x00007f448a3c3234 in QXcbWindow::netWmStates() () from /lib64/libQt5XcbQpa.so.5
#5  0x00007f448a3c34d9 in QXcbWindow::handlePropertyNotifyEvent(xcb_property_notify_event_t const*) () from /lib64/libQt5XcbQpa.so.5
#6  0x00007f448a3b30b8 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () from /lib64/libQt5XcbQpa.so.5
#7  0x00007f448a3b4536 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5XcbQpa.so.5
#8  0x00007f448a3d6ce7 in xcbSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib64/libQt5XcbQpa.so.5
#9  0x00007f4499f1976f in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#10 0x00007f4499f19af8 in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#11 0x00007f4499f19bc3 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#12 0x00007f449b938b75 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#13 0x00007f449b8ec1db in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib64/libQt5Core.so.5
#14 0x00007f449b8f3db6 in QCoreApplication::exec() () from /lib64/libQt5Core.so.5
#15 0x000055f1ab5df4fd in main ()
[Inferior 1 (process 4361) detached]

Reported using DrKonqi
Comment 1 Aleix Pol 2020-03-09 18:16:49 UTC 
This is a crash in libappstream.
Comment 2 Aleix Pol 2020-03-09 19:49:49 UTC 
AppStream maintainer confirmed that getting a newer stable libappstream solves this issue:
https://github.com/ximion/appstream/commit/da9f330dfd0a585ec2d319c0878f7f9da0838200