Application: kdeinit5 ()

Qt Version: 5.4.1
Operating System: Linux 3.19.0-15-generic x86_64
Distribution: Ubuntu 15.04

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

A notification regarding software updates brings up a window labelled "Update Information - KDE Daemon", which has an option "Record your encryption passphrase" (for ecryptfs). Clicking the "Run this action now" button causes the window to hang for a second before crashing.

The crash can be reproduced every time.

-- Backtrace:
Application: kdeinit5 (kdeinit5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f143e697780 (LWP 1574))]

Thread 4 (Thread 0x7f142ae0d700 (LWP 1576)):
#0  0x00007f143cd908dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f143b287b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f143b28964f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f142d5f6099 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#4  0x00007f143d102b0e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f143a9db6aa in start_thread (arg=0x7f142ae0d700) at pthread_create.c:333
#6  0x00007f143cd9beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f141f2ee700 (LWP 1593)):
#0  0x00007f143cd908dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1439f7eebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1439f7efcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f143d399c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f143d33e3e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f143d0fdb44 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f1428e01cf7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007f143d102b0e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f143a9db6aa in start_thread (arg=0x7f141f2ee700) at pthread_create.c:333
#9  0x00007f143cd9beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f141eaed700 (LWP 1594)):
#0  0x00007f143cd908dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f1439f7eebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f1439f7efcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f143d399c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f143d33e3e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f143d0fdb44 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f143d102b0e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f143a9db6aa in start_thread (arg=0x7f141eaed700) at pthread_create.c:333
#8  0x00007f143cd9beed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f143e697780 (LWP 1574)):
[KCrash Handler]
#6  0x0000000000000000 in ?? ()
#7  0x00007f143d348629 in QMetaObject::cast(QObject*) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f13eb98ee67 in qobject_cast<QObject*> (object=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobject.h:520
#9  object (v=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:697
#10 invoke (a=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:96
#11 qvariant_cast<QObject*> (v=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:823
#12 HookGui::runCommand (this=<optimized out>, obj=0x1edf930) at ../../../src/daemon/hookevent/hookgui.cpp:126
#13 0x00007f13eb99ee64 in HookGui::qt_static_metacall (_o=0x104cd80, _c=18402272, _id=-1498032, _a=0x0) at moc_hookgui.cpp:90
#14 0x00007f143d3719c9 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f143d37d582 in QSignalMapper::mapped(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f143d37ea07 in QSignalMapper::map(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007f143d3719c9 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007f143bbad012 in QAbstractButton::clicked(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007f143b8fa675 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007f143b8fb299 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007f143b8fb454 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007f143b8421e8 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007f143b7feb2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007f143b8048eb in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007f143d340c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#26 0x00007f143b8033da in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007f143b85acc0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007f143b85ce33 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007f143b7feb2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007f143b804000 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007f143d340c2b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007f143e052f82 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#33 0x00007f143e054b45 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#34 0x00007f143e03934f in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#35 0x00007f142d620590 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#36 0x00007f1439f7ec3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f1439f7ef20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f1439f7efcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#39 0x00007f143d399c57 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007f143d33e3e2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007f143d34602c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#42 0x00007f142d332321 in kdemain (argc=1, argv=<optimized out>) at ../../src/kded.cpp:846
#43 0x0000000000408716 in launch (argc=argc@entry=1, _name=_name@entry=0x40b7fe "kded5", args=<optimized out>, args@entry=0x0, cwd=cwd@entry=0x0, envc=envc@entry=0, envs=<optimized out>, envs@entry=0x0, reset_env=false, tty=0x0, avoid_loops=false, startup_id_str=0x40b710 "0") at ../../../src/kdeinit/kinit.cpp:741
#44 0x00000000004058e9 in main (argc=5, argv=<optimized out>) at ../../../src/kdeinit/kinit.cpp:1808

Reported using DrKonqi