Bug 423330

Application: plasmashell (5.16.5)

Qt Version: 5.12.4
Frameworks Version: 5.62.0
Operating System: Linux 5.3.0-59-generic x86_64
Distribution: Ubuntu 19.10

-- Information about the crash:
- Unusual behavior I noticed: Unexpected crash of the app, the KDE taskbar and the desktop have suddenly disappeared.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f1627980880 (LWP 2521))]

Thread 9 (Thread 0x7f15f7573700 (LWP 6311)):
#0  0x00007f162aea0c2f in __GI___poll (fds=0x7f15ec003ab0, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f160d59d1c6 in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#2  0x00007f160d58e831 in pa_mainloop_poll () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#3  0x00007f160d58eeb3 in pa_mainloop_iterate () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#4  0x00007f160d58ef60 in pa_mainloop_run () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#5  0x00007f160d59d10d in  () at /usr/lib/x86_64-linux-gnu/libpulse.so.0
#6  0x00007f160d2fd37c in  () at /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-13.0.so
#7  0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#8  0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f1605a4a700 (LWP 3406)):
#0  0x00007f162b446f06 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007f162b4457bd in QTimerInfoList::updateCurrentTime() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f162b445d99 in QTimerInfoList::timerWait(timespec&) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f162b4473a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f1629bc402f in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1629bc49db in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f1629bc4be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f162b447653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f162b3ee5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f162b227a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f162b228c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#12 0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f16062d8700 (LWP 3382)):
#0  0x00007f162aea0c2f in __GI___poll (fds=0x7f15f80029e0, nfds=1, timeout=1748339) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f1629bc4aae in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1629bc4be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f162b447653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f162b3ee5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f162b227a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f1606ac401c in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f162b228c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f160dfe5700 (LWP 3089)):
#0  0x00007f162ae9c2ac in __GI___libc_read (nbytes=16, buf=0x7f160dfe4ad0, fd=16) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f162ae9c2ac in __GI___libc_read (fd=16, buf=0x7f160dfe4ad0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f1629c0c70f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1629bc45fe in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1629bc4a52 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1629bc4be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f162b447653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f162b3ee5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f162b227a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f162cfbf8aa in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007f162b228c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#12 0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f161d722700 (LWP 2919)):
#0  0x00007f162a6b22c6 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55bc2731a3d8) at ../sysdeps/unix/sysv/linux/futex-internal.h:80
#1  0x00007f162a6b22c6 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55bc2731a388, cond=0x55bc2731a3b0) at pthread_cond_wait.c:508
#2  0x00007f162a6b22c6 in __pthread_cond_wait (cond=0x55bc2731a3b0, mutex=0x55bc2731a388) at pthread_cond_wait.c:638
#3  0x00007f161e1a591b in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#4  0x00007f161e1a553b in  () at /usr/lib/x86_64-linux-gnu/dri/nouveau_dri.so
#5  0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f161ffff700 (LWP 2706)):
#0  0x00007f1629bc43a3 in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f1629bc4a52 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1629bc4be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f162b447653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f162b3ee5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f162b227a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f162ccea319 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f162b228c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f1625a06700 (LWP 2555)):
#0  0x00007f162aea0c2f in __GI___poll (fds=0x7f1618009f10, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f1629bc4aae in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1629bc4be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f162b447653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f162b3ee5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f162b227a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f162bd0cefa in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f162b228c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f162689c700 (LWP 2530)):
#0  0x00007f162aea0c2f in __GI___poll (fds=0x7f162689bc28, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f162d43e917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f162d44053a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f162704d288 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f162b228c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f162a6ab669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f162aead323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f1627980880 (LWP 2521)):
[KCrash Handler]
#6  0x00007f162ab89a07 in  () at /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#7  0x00007f162abc7daa in KIO::DropJob::setApplicationActions(QList<QAction*> const&) () at /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#8  0x00007f162411ab54 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#9  0x00007f162411bda5 in  () at /usr/lib/x86_64-linux-gnu/qt5/plugins/plasma/scriptengines/plasma_appletscript_declarative.so
#10 0x00007f162b41b3f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f1629a76c4b in KIO::TransferJob::mimetype(KIO::Job*, QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#12 0x00007f1629a76e76 in KIO::TransferJob::slotMimetype(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#13 0x00007f162b41b558 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f1629a39039 in KIO::SlaveInterface::mimeType(QString const&) () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#15 0x00007f1629a3b46c in KIO::SlaveInterface::dispatch(int, QByteArray const&) () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#16 0x00007f1629a391bf in KIO::SlaveInterface::dispatch() () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#17 0x00007f1629a42e22 in KIO::Slave::gotInput() () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#18 0x00007f162b41b558 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x00007f16299bc70e in  () at /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#20 0x00007f162b41be4a in QObject::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f162bf8ba86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007f162bf94e00 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f162b3efa2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007f162b3f26a8 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f162b448037 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f1629bc48bd in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f1629bc4b40 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f1629bc4be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f162b447635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007f162b3ee5cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#31 0x00007f162b3f6336 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x000055bc251d7774 in  ()
#33 0x00007f162adb21e3 in __libc_start_main (main=0x55bc251d6c20, argc=1, argv=0x7fff5ed02c38, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff5ed02c28) at ../csu/libc-start.c:308
#34 0x000055bc251d7bfe in _start ()
[Inferior 1 (process 2521) detached]

Reported using DrKonqi