Bug 420648

Application: plasma-discover (5.16.5)

Qt Version: 5.12.4
Frameworks Version: 5.62.0
Operating System: Linux 5.3.0-29-generic x86_64
Distribution: Ubuntu 19.10

-- Information about the crash:
- What I was doing when the application crashed:

I had done an apt update/upgrade and now Discover crashes when started. I see an outline of the Discover window and then crash.

The crash can be reproduced every time.

-- Backtrace:
Application: Discover (plasma-discover), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f7b561af680 (LWP 9881))]

Thread 9 (Thread 0x7f7b38fe5700 (LWP 9898)):
#0  0x00007f7b59eef94d in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f7b5a274081 in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f7b5a464875 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f7b5a852f00 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#4  0x00007f7b5a909874 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#5  0x00007f7b5a4643f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7b5a848985 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#7  0x00007f7b5a84924b in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#8  0x00007f7b5a4643f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7b5a9029d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#10 0x00007f7b5a8f6b5e in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#11 0x00007f7b5a8f6fa6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#12 0x00007f7b5a8d0d13 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#13 0x00007f7b5a4643f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f7b5a893834 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#15 0x00007f7b5a8938cf in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#16 0x00007f7b5a8a5db9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#17 0x00007f7b5b8bba86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f7b5b8c4e00 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f7b5a438a2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f7b5a491295 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f7b58c718bd in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f7b58c71b40 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f7b5a490635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f7b5a4375cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f7b5a270a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f7b5a271c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#29 0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f7b39ffb700 (LWP 9890)):
#0  0x00007f7b59ee52ac in __GI___libc_read (nbytes=16, buf=0x7f7b39ffabd0, fd=24) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f7b59ee52ac in __GI___libc_read (fd=24, buf=0x7f7b39ffabd0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f7b58cb970f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7b58c715fe in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7b58c71a52 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7b58c71e33 in g_main_loop_run () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f7b589698da in  () at /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#7  0x00007f7b58c9b181 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#9  0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f7b3a7fc700 (LWP 9889)):
#0  0x00007f7b59ee9c2f in __GI___poll (fds=0x562d8ff410a0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7b58c71aae in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7b58c71c31 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7b58c9b181 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f7b3bfff700 (LWP 9886)):
#0  0x00007f7b59eef94d in syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f7b5a274081 in QSemaphore::acquire(int) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007f7b5a464875 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007f7b5a852f00 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#4  0x00007f7b5a909874 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#5  0x00007f7b5a4643f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7b5a848985 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#7  0x00007f7b5a84924b in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#8  0x00007f7b5a4643f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7b5a9029d3 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#10 0x00007f7b5a8f6b5e in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#11 0x00007f7b5a8f6fa6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#12 0x00007f7b5a8d0d13 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#13 0x00007f7b5a4643f8 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007f7b5a893834 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#15 0x00007f7b5a8938cf in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#16 0x00007f7b5a8a5db9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#17 0x00007f7b5b8bba86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007f7b5b8c4e00 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f7b5a438a2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007f7b5a491295 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007f7b58c718bd in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f7b58c71b40 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f7b5a490635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f7b5a4375cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f7b5a270a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x00007f7b5a271c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#29 0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f7b45131700 (LWP 9885)):
#0  0x00007f7b59ee52ac in __GI___libc_read (nbytes=16, buf=0x7f7b45130a90, fd=14) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f7b59ee52ac in __GI___libc_read (fd=14, buf=0x7f7b45130a90, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f7b58cb970f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7b58c715fe in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7b58c71a52 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f7b5a490653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7b5a4375cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7b5a270a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7b5a271c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#11 0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f7b4ec92700 (LWP 9884)):
#0  0x00007f7b58cbdc3d in g_mutex_lock () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f7b58c7103a in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7b58c719db in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7b5a490653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7b5a4375cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f7b5a270a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7b5ac8b319 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f7b5a271c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#10 0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f7b4fea3700 (LWP 9883)):
#0  0x00007f7b59ee52ac in __GI___libc_read (nbytes=16, buf=0x7f7b4fea2a60, fd=7) at ../sysdeps/unix/sysv/linux/read.c:26
#1  0x00007f7b59ee52ac in __GI___libc_read (fd=7, buf=0x7f7b4fea2a60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f7b58cb970f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7b58c715fe in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f7b58c71a52 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f7b5a490653 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f7b5a4375cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f7b5a270a45 in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7b5ae35efa in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007f7b5a271c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#12 0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f7b54fdb700 (LWP 9882)):
#0  0x00007f7b59ee9c2f in __GI___poll (fds=0x7f7b54fdaba8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7b58b8d917 in  () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f7b58b8f53a in xcb_wait_for_event () at /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f7b557be288 in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f7b5a271c92 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f7b59646669 in start_thread (arg=<optimized out>) at pthread_create.c:479
#6  0x00007f7b59ef6323 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f7b561af680 (LWP 9881)):
[KCrash Handler]
#6  0x00007f7b59e1a3eb in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#7  0x00007f7b59df9899 in __GI_abort () at abort.c:79
#8  0x00007f7b5a238a99 in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f7b5bfd494d in QSGRenderLoop::handleContextCreationFailure(QQuickWindow*, bool) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007f7b5bfd5a25 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f7b5bfd62ed in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007f7b5b29cb3d in QWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#13 0x00007f7b5c05567f in QQuickWindow::event(QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#14 0x00007f7b5b8bba86 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007f7b5b8c4e00 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007f7b5a438a2a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f7b5b2932d6 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#18 0x00007f7b5b293504 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#19 0x00007f7b5b26d26b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#20 0x00007f7b557bf28e in  () at /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#21 0x00007f7b58c718bd in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f7b58c71b40 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f7b58c71be3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f7b5a490635 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007f7b5a4375cb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f7b5a43f336 in QCoreApplication::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#27 0x0000562d8d8b35a1 in  ()
#28 0x00007f7b59dfb1e3 in __libc_start_main (main=0x562d8d8b2f00, argc=3, argv=0x7fffc4fe8938, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffc4fe8928) at ../csu/libc-start.c:308
#29 0x0000562d8d8b3b3e in _start ()
[Inferior 1 (process 9881) detached]

Reported using DrKonqi