Application: plasma-discover (5.12.4)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-24-generic x86_64
Distribution: Ubuntu 18.04 LTS

-- Information about the crash:
I attempted to update a number of processes on a new installation. Simultaneously, I attempted to install some softwares through Discover. Discover crashed during the update process and consistently crashes upon launch. 

I have restarted the computer, but the problem persists.

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".
[Current thread is 1 (Thread 0x7f11238f1f40 (LWP 1902))]

Thread 13 (Thread 0x7f10ce9ec700 (LWP 1918)):
#0  0x00007f111efddbf9 in __GI___poll (fds=0x7f10c8004e10, nfds=1, timeout=9646) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f11198cc439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f11198cc54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f111f92b90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f111f8d09ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f111f6ef22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f111f6f416d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f111b7f16db in start_thread (arg=0x7f10ce9ec700) at pthread_create.c:463
#8  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f10f093e700 (LWP 1916)):
#0  0x00007f1119911cf4 in g_mutex_unlock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f11198cb327 in g_main_context_acquire () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f11198cc2f5 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f11198cc54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f111f92b90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f111f8d09ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f111f6ef22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f1122ace2a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f111f6f416d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f111b7f16db in start_thread (arg=0x7f10f093e700) at pthread_create.c:463
#10 0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f10f113f700 (LWP 1913)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804c988) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804c938, cond=0x5634b804c960) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804c960, mutex=0x5634b804c938) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f113f700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f10f1940700 (LWP 1912)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804c988) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804c938, cond=0x5634b804c960) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804c960, mutex=0x5634b804c938) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f1940700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f10f2141700 (LWP 1911)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804c8a0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804c850, cond=0x5634b804c878) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804c878, mutex=0x5634b804c850) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f2141700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f10f2942700 (LWP 1910)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804c8a0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804c850, cond=0x5634b804c878) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804c878, mutex=0x5634b804c850) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f2942700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f10f3143700 (LWP 1909)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804c8a0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804c850, cond=0x5634b804c878) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804c878, mutex=0x5634b804c850) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f3143700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f10f3944700 (LWP 1908)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804e970) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804e920, cond=0x5634b804e948) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804e948, mutex=0x5634b804e920) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f3944700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f10f4563700 (LWP 1907)):
#0  0x00007f111b7f79f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5634b804bab8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  0x00007f111b7f79f3 in __pthread_cond_wait_common (abstime=0x0, mutex=0x5634b804ba68, cond=0x5634b804ba90) at pthread_cond_wait.c:502
#2  0x00007f111b7f79f3 in __pthread_cond_wait (cond=0x5634b804ba90, mutex=0x5634b804ba68) at pthread_cond_wait.c:655
#3  0x00007f10fd437b7b in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007f10fd4378a7 in  () at /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007f111b7f16db in start_thread (arg=0x7f10f4563700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f11068a9700 (LWP 1906)):
#0  0x00007f111efd90b4 in __GI___libc_read (fd=9, buf=0x7f11068a8b70, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007f1119910960 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f11198cbf27 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f11198cc3e0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f11198cc54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f111f92b90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f111f8d09ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f111f6ef22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f11203056f5 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f111f6f416d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f111b7f16db in start_thread (arg=0x7f11068a9700) at pthread_create.c:463
#11 0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f1107aba700 (LWP 1905)):
#0  0x00007f111efddbf9 in __GI___poll (fds=0x7f1100019250, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f11198cc439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f11198cc54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f111f92b90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f111f8d09ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f111f6ef22a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f1121a90d45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f111f6f416d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f111b7f16db in start_thread (arg=0x7f1107aba700) at pthread_create.c:463
#9  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f1110f9a700 (LWP 1904)):
#0  0x00007f111efddbf9 in __GI___poll (fds=0x7f1110f99ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f1119663747 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f111966536a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f1113d472a9 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f111f6f416d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f111b7f16db in start_thread (arg=0x7f1110f9a700) at pthread_create.c:463
#6  0x00007f111efea88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f11238f1f40 (LWP 1902)):
[KCrash Handler]
#6  0x00007f111f9133cd in QVariant::QVariant(QString const&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f11227738f3 in SourcesModel::addSourcesBackend(AbstractSourcesBackend*) () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#8  0x00007f10c250360e in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/flatpak-backend.so
#9  0x00007f10c250b87b in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/flatpak-backend.so
#10 0x00007f1122779507 in DiscoverBackendsFactory::backendForFile(QString const&, QString const&) const () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#11 0x00007f1122779b9b in DiscoverBackendsFactory::backend(QString const&) const () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#12 0x00007f1122779fff in DiscoverBackendsFactory::allBackends() const () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#13 0x00007f11227653ca in ResourcesModel::registerAllBackends() () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#14 0x00007f1122789855 in  () at /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#15 0x00007f111f902122 in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f1120edf82c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007f1120ee70f4 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f111f8d29a8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f111f8d511d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f111f92c2c3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f11198cc287 in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f11198cc4c0 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f11198cc54c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f111f92b8ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f111f8d09ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f111f8d9a84 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00005634b758df58 in  ()
#28 0x00007f111eeeab97 in __libc_start_main (main=0x5634b758d680, argc=1, argv=0x7fff56dfcd38, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff56dfcd28) at ../csu/libc-start.c:310
#29 0x00005634b758e13a in _start ()

Reported using DrKonqi