Bug 412529

Summary: [xdg-desktop-portal-kde] : sporadic crash on exitting a KDE application.
Product: [Plasma] xdg-desktop-portal-kde Reporter: RJVB <rjvbertin>
Component: generalAssignee: Jan Grulich <jgrulich>
Status: RESOLVED FIXED    
Severity: crash CC: nate
Priority: NOR Keywords: drkonqi
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Compiled Sources   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description RJVB 2019-10-02 09:16:25 UTC 
Application: xdg-desktop-portal-kde ()
 (Compiled from sources)
Qt Version: 5.9.8
Frameworks Version: 5.60.0
Operating System: Linux 4.14.23-ck1-mainline-core2-rjvb x86_64
Distribution: Ubuntu 14.04.6 LTS

-- Information about the crash:
- What I was doing when the application crashed:
This is a crash I see with some frequency, when exitting a KDE application. If there is a pattern I have yet to discover it.

The crash can be reproduced sometimes.

-- Backtrace:
Application: xdg-desktop-portal-kde (xdg-desktop-portal-kde), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f6d30b3e840 (LWP 14813))]

Thread 3 (Thread 0x7f6d0dd5d700 (LWP 14866)):
#0  0x00007f6d27e207d1 in pthread_mutex_unlock () at /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007f6d2302b264 in g_mutex_unlock (mutex=<optimized out>) at gthread-posix.c:233
#2  0x00007f6d2302b264 in g_main_context_dispatch (context=<optimized out>) at gmain.c:3840
#3  0x00007f6d2302b7b5 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3908
#4  0x00007f6d2302ba21 in g_main_context_iteration (context=0x7f6d08000990, may_block=1) at gmain.c:3969
#5  0x00007f6d2b24041b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f6d080008c0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#6  0x00007f6d2b1ec2b2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f6d0dd5cd88, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#7  0x00007f6d2b1ec2b2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f6d0dd5cd88, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#8  0x00007f6d2b037707 in QThread::exec() (this=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread.cpp:515
#9  0x00007f6d2cc63610 in QDBusConnectionManager::run() (this=0x7f6d2cec32e0 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/dbus/qdbusconnection.cpp:178
#10 0x00007f6d2b03b2c3 in QThreadPrivate::start(void*) (arg=0x7f6d2cec32e0 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#11 0x00007f6d27e1d184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#12 0x00007f6d2a45103d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 2 (Thread 0x7f6d1b580700 (LWP 14817)):
#0  0x00007f6d2a443c9d in poll () at /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007f6d2647eab2 in _xcb_conn_wait () at /opt/local/lib/libxcb.so.1
#2  0x00007f6d26480eba in xcb_wait_for_event () at /opt/local/lib/libxcb.so.1
#3  0x00007f6d1d4d5af9 in QXcbEventReader::run() (this=0x694780) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1330
#4  0x00007f6d2b03b2c3 in QThreadPrivate::start(void*) (arg=0x694780) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/thread/qthread_unix.cpp:368
#5  0x00007f6d27e1d184 in start_thread () at /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007f6d2a45103d in clone () at /lib/x86_64-linux-gnu/libc.so.6

Thread 1 (Thread 0x7f6d30b3e840 (LWP 14813)):
[KCrash Handler]
#6  0x00007f6d3049a9d8 in KNotification::close() (this=0xa95910) at /opt/local/var/lnxports/build/_opt_local_site-ports_kf5_KF5-Frameworks/kf5-knotifications/work/knotifications-5.60.0/src/knotification.cpp:338
#7  0x000000000041f1f6 in NotificationPortal::RemoveNotification(QString const&, QString const&) (this=<optimized out>, app_id=..., id=...) at /home/bertin/work/src/Scratch/KDE/KF5/xdgdtoportal-kde-git/src/notification.cpp:160
#8  0x0000000000411755 in NotificationPortal::qt_metacall(QMetaObject::Call, int, void**) (this=0xa28990, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fffec5e5a50) at /home/bertin/work/src/Scratch/KDE/KF5/xdgdtoportal-kde-git/build/src/xdg-desktop-portal-kde_autogen/EWIEGA46WW/moc_notification.cpp:128
#9  0x00007f6d2cc6bbb8 in QDBusConnectionPrivate::deliverCall(QObject*, int, QDBusMessage const&, QVector<int> const&, int) (this=0x7f6d08003150, object=0xa28990, msg=..., metaTypes=..., slotIdx=6) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/dbus/qdbusintegrator.cpp:998
#10 0x00007f6d2cc6c42a in QDBusConnectionPrivate::activateCall(QObject*, int, QDBusMessage const&) (this=0x7f6d08003150, object=0xa28990, flags=273, msg=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/dbus/qdbusintegrator.cpp:901
#11 0x00007f6d2cc73887 in QDBusConnectionPrivate::activateObject(QDBusConnectionPrivate::ObjectTreeNode&, QDBusMessage const&, int) (this=0x7f6d08003150, node=..., msg=..., pathStartPos=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/dbus/qdbusintegrator.cpp:1514
#12 0x00007f6d2cc739fe in QDBusActivateObjectEvent::placeMetaCall(QObject*) (this=0x7f6d08007b10) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/dbus/qdbusintegrator.cpp:1610
#13 0x00007f6d2b2184a1 in QObject::event(QEvent*) (this=0xa29e30, e=<optimized out>) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qobject.cpp:1252
#14 0x00007f6d2c2f99a7 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=0x67bb00, receiver=0xa29e30, e=0x7f6d08007b10) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/widgets/kernel/qapplication.cpp:3722
#15 0x00007f6d2c2f6d58 in QApplication::notify(QObject*, QEvent*) (this=0x7fffec5e6368, receiver=<optimized out>, e=0x7f6d08007b10) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/widgets/kernel/qapplication.cpp:3093
#16 0x00007f6d2b1f0426 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0xa29e30, event=0x7f6d08007b10) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qcoreapplication.cpp:1031
#17 0x00007f6d2b1f12af in QCoreApplication::sendEvent(QObject*, QEvent*) (receiver=<optimized out>, event=<optimized out>) at .moc/../../../../../qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qcoreapplication.h:233
#18 0x00007f6d2b1f12af in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (receiver=0x0, event_type=0, data=0x67a680) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qcoreapplication.cpp:1706
#19 0x00007f6d2b240963 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) (s=0x7dfbf0) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:276
#20 0x00007f6d2302b0e5 in g_main_dispatch (context=<optimized out>) at gmain.c:3170
#21 0x00007f6d2302b0e5 in g_main_context_dispatch (context=<optimized out>) at gmain.c:3835
#22 0x00007f6d2302b7b5 in g_main_context_iterate (context=<optimized out>, block=<optimized out>, dispatch=<optimized out>, self=<optimized out>) at gmain.c:3908
#23 0x00007f6d2302ba21 in g_main_context_iteration (context=0x7f6d14003030, may_block=1) at gmain.c:3969
#24 0x00007f6d2b24041b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f1aa0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:425
#25 0x00007f6d2b1ec2b2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fffec5e62e0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:134
#26 0x00007f6d2b1ec2b2 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fffec5e62e0, flags=...) at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qeventloop.cpp:212
#27 0x00007f6d2b1f0aed in QCoreApplication::exec() () at /opt/local/var/lnxports/build/_opt_local_site-ports_aqua_qt5-kde-devel/qt5-kde-devel/work/qt-everywhere-opensource-src-5.9.8/qtbase/src/corelib/kernel/qcoreapplication.cpp:1304
#28 0x00000000004127bf in main(int, char**) (argc=1, argv=<optimized out>) at /home/bertin/work/src/Scratch/KDE/KF5/xdgdtoportal-kde-git/src/xdg-desktop-portal-kde.cpp:47

Possible duplicates by query: bug 291633, bug 250902, bug 250559, bug 224673, bug 218428.

Reported using DrKonqi
Comment 1 Nate Graham 2022-01-18 19:50:51 UTC 
> knotifications-5.60.0
That's two and a half years old. Can you try again with a more recent version?
Comment 2 RJVB 2022-01-18 21:50:36 UTC 
Well, I reported it alsmost 1.5 years ago ... O:-)

Haven't been seeing it for a while though, at least not since updating the KDE portal plugin a while back.
Comment 3 Nate Graham 2022-01-18 21:51:28 UTC 
LOL so you did, sorry.

Anyway, that's good that it's not happening anymore.