Bug 374932

Application: plasmashell (5.7.5)

Qt Version: 5.6.1
Frameworks Version: 5.26.0
Operating System: Linux 4.8.0-22-generic x86_64
Distribution: Ubuntu 16.10

-- Information about the crash:
- What I was doing when the application crashed:
I've just started virtualbox and had blackscreen. When I restarted virtualbox, kubuntu booted and showed me that plasma has crashed.

The crash can be reproduced every time.

-- 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 0x7fa12ca7a8c0 (LWP 1976))]

Thread 7 (Thread 0x7fa06367e700 (LWP 2119)):
#0  0x00007fa12730b0bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa12404b9d6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa12404baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa127c394ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa127be10fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa127a06d43 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa065b8d5c7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007fa127a0bc68 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa126aeb70a in start_thread (arg=0x7fa06367e700) at pthread_create.c:333
#9  0x00007fa1273170af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 6 (Thread 0x7fa0746b6700 (LWP 2108)):
#0  __libc_disable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:96
#1  0x00007fa127306c99 in read () at ../sysdeps/unix/syscall-template.S:84
#2  0x00007fa12408fc60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa12404b485 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa12404b974 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa12404baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fa127c394ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fa127be10fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa127a06d43 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fa12ac91706 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fa127a0bc68 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fa126aeb70a in start_thread (arg=0x7fa0746b6700) at pthread_create.c:333
#12 0x00007fa1273170af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 5 (Thread 0x7fa109cee700 (LWP 2080)):
#0  0x00007fa12404b8c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fa12404baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa127c394ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fa127be10fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa127a06d43 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa12a309c65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6  0x00007fa127a0bc68 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fa126aeb70a in start_thread (arg=0x7fa109cee700) at pthread_create.c:333
#8  0x00007fa1273170af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 4 (Thread 0x7fa10adc7700 (LWP 2058)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fa12c4d1574 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fa12c4d15b9 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fa126aeb70a in start_thread (arg=0x7fa10adc7700) at pthread_create.c:333
#4  0x00007fa1273170af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 3 (Thread 0x7fa110914700 (LWP 2054)):
#0  0x00007fa127306c8d in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa12408fc60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa12404b485 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa12404b974 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa12404baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa127c394ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa127be10fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fa127a06d43 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa12a309c65 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fa127a0bc68 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fa126aeb70a in start_thread (arg=0x7fa110914700) at pthread_create.c:333
#11 0x00007fa1273170af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 2 (Thread 0x7fa11a31f700 (LWP 2016)):
#0  0x00007fa12730b0bd in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fa12404b9d6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa12404baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa127c394ab in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fa127be10fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fa127a06d43 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fa12cbb8575 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fa127a0bc68 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fa126aeb70a in start_thread (arg=0x7fa11a31f700) at pthread_create.c:333
#9  0x00007fa1273170af in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105

Thread 1 (Thread 0x7fa12ca7a8c0 (LWP 1976)):
[KCrash Handler]
#6  0x00007fa12ad13d04 in QQuickItem::isEnabled() const () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fa12ad2f6dc in QQuickWindowPrivate::setFocusInScope(QQuickItem*, QQuickItem*, Qt::FocusReason, QFlags<QQuickWindowPrivate::FocusOption>) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fa12ad16398 in QQuickItem::setFocus(bool, Qt::FocusReason) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007fa12ad282b0 in QQuickWindow::focusInEvent(QFocusEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#10 0x00007fa127f42133 in QWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007fa12ad35a13 in QQuickWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x0000559702c00ae3 in ?? ()
#13 0x00007fa12851e8ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#14 0x00007fa128523d4f in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#15 0x00007fa127be33b0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007fa127f37b69 in QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#17 0x00007fa127f37eed in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#18 0x00007fa127f15b2b in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#19 0x00007fa119795660 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#20 0x00007fa12404b7d7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007fa12404ba40 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fa12404baec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fa127c3948f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007fa127be10fa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#25 0x00007fa127be990c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x0000559702bf2f1f in ?? ()
#27 0x00007fa12722f3f1 in __libc_start_main (main=0x559702bf23b0, argc=2, argv=0x7ffd914e6fd8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd914e6fc8) at ../csu/libc-start.c:291
#28 0x0000559702bf329a in _start ()

Possible duplicates by query: bug 373231, bug 373064, bug 373049, bug 372773, bug 372490.

Reported using DrKonqi