Bug 388644

Summary: Kwin: Crash after login to Plasma-Wayland
Product: [Plasma] kwin Reporter: Rainer Finke <rainer>
Component: wayland-genericAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: normal Keywords: investigated, triaged
Priority: NOR    
Version First Reported In: 5.11.5   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Rainer Finke 2018-01-07 11:04:19 UTC 
Sometimes Kwin has a segmentation fault right after the login to Plasma-Wayland (maybe in 20% of the logins, but sometimes in a row several times and then it is ok again for several logins). I had this issue with my AMD GPU.

Linux 4.14.12
Plasma 5.11.5
KDE Frameworks 5.41
Qt 5.10

$ sudo echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope
[sudo] Passwort für rainer:                                                                                                                                                                                                                                             
0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
[rainer@gd1 ~]$ sudo gdb --pid `pidof kwin_wayland` 2>&1 | tee kwin2.gdb                                                                                                                                                                                                
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Attaching to process 733                                                                                                                                                                                                                                                
[New LWP 734]                                                                                                                                                                                                                                                           
[New LWP 735]                                                                                                                                                                                                                                                           
[New LWP 736]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
0x00007f7d5fdd0402 in do_lookup_x () from /lib64/ld-linux-x86-64.so.2
(gdb) continue
Continuing.
[New Thread 0x7f7d359bd700 (LWP 760)]
[New Thread 0x7f7d34e69700 (LWP 761)]
[New Thread 0x7f7d27fff700 (LWP 762)]
[New Thread 0x7f7d277fe700 (LWP 763)]
[New Thread 0x7f7d26ffd700 (LWP 764)]
[New Thread 0x7f7d267fc700 (LWP 765)]
[New Thread 0x7f7d25ffb700 (LWP 766)]
[New Thread 0x7f7d257fa700 (LWP 767)]
[New Thread 0x7f7d24ff9700 (LWP 769)]
[New Thread 0x7f7d03fff700 (LWP 803)]
[New Thread 0x7f7d03656700 (LWP 806)]
[New Thread 0x7f7d019d0700 (LWP 807)]
[New Thread 0x7f7d00fc9700 (LWP 808)]
[New Thread 0x7f7cf3fff700 (LWP 809)]
[New Thread 0x7f7cf37fe700 (LWP 810)]
[New Thread 0x7f7c66195700 (LWP 1171)]

Thread 1 "kwin_wayland" received signal SIGSEGV, Segmentation fault.
0x00007f7d56510bbc in ?? () from /usr/lib/libwayland-server.so.0
(gdb) bt
#0  0x00007f7d56510bbc in  () at /usr/lib/libwayland-server.so.0
#1  0x00007f7d56515619 in  () at /usr/lib/libwayland-server.so.0
#2  0x00007f7d56510cff in wl_client_destroy () at /usr/lib/libwayland-server.so.0
#3  0x00007f7d56510db9 in  () at /usr/lib/libwayland-server.so.0
#4  0x00007f7d565129b2 in wl_event_loop_dispatch () at /usr/lib/libwayland-server.so.0
#5  0x00007f7d5f17b2bf in KWayland::Server::Display::Private::dispatch() () at /usr/lib/libKF5WaylandServer.so.5
#6  0x00007f7d5f99c9e1 in  () at /usr/lib/libkwin.so.5
#7  0x00007f7d5f9986eb in  () at /usr/lib/libkwin.so.5
#8  0x00007f7d5f998904 in  () at /usr/lib/libkwin.so.5
#9  0x00007f7d5dd85b2f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#10 0x00007f7d5f996050 in KWin::PointerInputRedirection::update() () at /usr/lib/libkwin.so.5
#11 0x00007f7d5dd85b2f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#12 0x00007f7d5f9abec1 in KWin::Workspace::updateStackingOrder(bool) () at /usr/lib/libkwin.so.5
#13 0x00007f7d5f934a0c in  () at /usr/lib/libkwin.so.5
#14 0x00007f7d5dd85b2f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#15 0x00007f7d5fb05d33 in KWin::WaylandServer::shellClientRemoved(KWin::ShellClient*) () at /usr/lib/libkwin.so.5
#16 0x00007f7d5fab8229 in KWin::WaylandServer::removeClient(KWin::ShellClient*) () at /usr/lib/libkwin.so.5
#17 0x00007f7d5faad24d in KWin::ShellClient::destroyClient() () at /usr/lib/libkwin.so.5
#18 0x00007f7d5dd85b2f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#19 0x00007f7d5f19756b in KWayland::Server::Resource::Private::unbind(wl_resource*) () at /usr/lib/libKF5WaylandServer.so.5
#20 0x00007f7d56510c12 in  () at /usr/lib/libwayland-server.so.0
#21 0x00007f7d56515619 in  () at /usr/lib/libwayland-server.so.0
#22 0x00007f7d56510cff in wl_client_destroy () at /usr/lib/libwayland-server.so.0
#23 0x00007f7d56510db9 in  () at /usr/lib/libwayland-server.so.0
#24 0x00007f7d565129b2 in wl_event_loop_dispatch () at /usr/lib/libwayland-server.so.0
#25 0x00007f7d5f17b2bf in KWayland::Server::Display::Private::dispatch() () at /usr/lib/libKF5WaylandServer.so.5
#26 0x00007f7d5dd85b2f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
#27 0x00007f7d5dd92349 in QSocketNotifier::activated(int, QSocketNotifier::QPrivateSignal) () at /usr/lib/libQt5Core.so.5
#28 0x00007f7d5dd92724 in QSocketNotifier::event(QEvent*) () at /usr/lib/libQt5Core.so.5
#29 0x00007f7d5e310e3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#30 0x00007f7d5e318816 in QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
#31 0x00007f7d5dd551e0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
#32 0x00007f7d5ddae651 in QEventDispatcherUNIXPrivate::activateSocketNotifiers() () at /usr/lib/libQt5Core.so.5
#33 0x00007f7d5ddaece9 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#34 0x00007f7d47e98bfe in  () at /usr/lib/qt/plugins/platforms/KWinQpaPlugin.so
#35 0x00007f7d5dd5382b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#36 0x00007f7d5dd5cb18 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
#37 0x000055dbb3e3c2c4 in  ()
#38 0x00007f7d5d172f4a in __libc_start_main () at /usr/lib/libc.so.6
#39 0x000055dbb3e3c6da in _start ()
(gdb)  

(gdb) thread 2
[Switching to thread 2 (Thread 0x7f7d455e1700 (LWP 734))]
#0  0x00007f7d5d23d91b in poll () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007f7d5d23d91b in poll () at /usr/lib/libc.so.6
#1  0x00007f7d54568ed3 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f7d54568fae in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f7d5ddb1691 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f7d5dd5382b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f7d5db6378e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f7d574a1416 in  () at /usr/lib/libQt5DBus.so.5
#7  0x00007f7d5db68b2d in  () at /usr/lib/libQt5Core.so.5
#8  0x00007f7d5ef0b08c in start_thread () at /usr/lib/libpthread.so.0
#9  0x00007f7d5d247e1f in clone () at /usr/lib/libc.so.6
(gdb) thread 3
[Switching to thread 3 (Thread 0x7f7d3ffff700 (LWP 735))]
#0  0x00007f7d5d23d91b in poll () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007f7d5d23d91b in poll () at /usr/lib/libc.so.6
#1  0x00007f7d54568ed3 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f7d54568fae in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f7d5ddb1691 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f7d5dd5382b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f7d5db6378e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f7d5db68b2d in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f7d5ef0b08c in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f7d5d247e1f in clone () at /usr/lib/libc.so.6
(gdb) thread 4
[Switching to thread 4 (Thread 0x7f7d3edee700 (LWP 736))]
#0  0x00007f7d5d23d91b in poll () from /usr/lib/libc.so.6
(gdb) bt
#0  0x00007f7d5d23d91b in poll () at /usr/lib/libc.so.6
#1  0x00007f7d54568ed3 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007f7d54568fae in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007f7d5ddb1691 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#4  0x00007f7d5dd5382b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
#5  0x00007f7d5db6378e in QThread::exec() () at /usr/lib/libQt5Core.so.5
#6  0x00007f7d5db68b2d in  () at /usr/lib/libQt5Core.so.5
#7  0x00007f7d5ef0b08c in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007f7d5d247e1f in clone () at /usr/lib/libc.so.6
(gdb) thread 5
[Switching to thread 5 (Thread 0x7f7d359bd700 (LWP 760))]
#0  0x00007f7d5ef1139d in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
(gdb) bt
#0  0x00007f7d5ef1139d in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007f7d36ffffbc in  () at /usr/lib/dri/radeonsi_dri.so
#2  0x00007f7d36fffec8 in  () at /usr/lib/dri/radeonsi_dri.so
#3  0x00007f7d5ef0b08c in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007f7d5d247e1f in clone () at /usr/lib/libc.so.6
(gdb)


In jounralctl was not a lot of information during Kwin segmentation fault.
$ journalctl -f 
Jan 07 11:40:03 pc org_kde_powerdevil[978]: kscreen.kwayland: Loading Wayland backend.
Jan 07 11:40:03 pc plasmashell[887]: trying to show an empty dialog
Jan 07 11:40:03 pc plasmashell[887]: Using the 'wl-shell' shell integration
Jan 07 11:40:03 pc plasmashell[887]: file:///usr/share/plasma/plasmoids/org.kde.desktopcontainment/contents/ui/FolderItemDelegate.qml:288:17: QML Text: Binding loop detected for property "width"
Jan 07 11:40:03 pc plasmashell[887]: Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Jan 07 11:40:03 pc kdeinit5[840]: ()
Jan 07 11:40:03 pc kdeinit5[840]: ("/home/rainer/kwin2.gdb")
Jan 07 11:40:03 pc kdeinit5[840]: ()
Jan 07 11:40:03 pc dbus-daemon[713]: [session uid=1000 pid=711] Activating service name='org.gnome.GConf' requested by ':1.40' (uid=1000 pid=895 comm="/usr/lib/firefox/firefox --sm-client-id 1016619316")
Jan 07 11:40:03 pc dbus-daemon[713]: [session uid=1000 pid=711] Successfully activated service 'org.gnome.GConf'
Jan 07 11:40:03 pc dbus-daemon[713]: [session uid=1000 pid=711] Activating service name='org.kde.kuiserver' requested by ':1.26' (uid=1000 pid=887 comm="/usr/bin/plasmashell ")
Jan 07 11:40:03 pc dbus-daemon[713]: [session uid=1000 pid=711] Successfully activated service 'org.kde.kuiserver'
Jan 07 11:40:04 pc akonadiserver[1065]: Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Jan 07 11:40:04 pc plasmashell[887]: Trying to use rootObject before initialization is completed, whilst using setInitializationDelayed. Forcing completion
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/main.qml:78:27: Unable to assign [undefined] to QStringList
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/share/plasma/plasmoids/org.kde.plasma.digitalclock/contents/ui/main.qml:37: TypeError: Cannot read property 'DateTime' of undefined
Jan 07 11:40:04 pc plasmashell[887]: Both point size and pixel size set. Using pixel size.
Jan 07 11:40:04 pc plasmashell[887]: Both point size and pixel size set. Using pixel size.
Jan 07 11:40:04 pc plasmashell[887]: Both point size and pixel size set. Using pixel size.
Jan 07 11:40:04 pc plasmashell[887]: trying to show an empty dialog
Jan 07 11:40:04 pc plasmashell[887]: trying to show an empty dialog
Jan 07 11:40:04 pc akonadi_imap_resource[1359]: Using Wayland-EGL
Jan 07 11:40:04 pc kdeinit5[840]: Registering "org.kde.StatusNotifierHost-887" as system tray
Jan 07 11:40:04 pc akonadi_archivemail_agent[1354]: Using Wayland-EGL
Jan 07 11:40:04 pc akonadi_ical_resource[1358]: "No file selected."
Jan 07 11:40:04 pc plasmashell[887]: couldn't load "/usr/lib/qt/plugins/discover-notifier/DiscoverPackageKitNotifier.so" because "Cannot load library /usr/lib/qt/plugins/discover-notifier/DiscoverPackageKitNotifier.so: (libpackagekitqt5.so.0: Kann die Shared-Object-Datei nicht öffnen: Datei oder Verzeichnis nicht gefunden)"
Jan 07 11:40:04 pc plasmashell[887]: couldn't load "/usr/lib/qt/plugins/discover-notifier/FlatpakNotifier.so" because "Cannot load library /usr/lib/qt/plugins/discover-notifier/FlatpakNotifier.so: (libflatpak.so.0: Kann die Shared-Object-Datei nicht öffnen: Datei oder Verzeichnis nicht gefunden)"
Jan 07 11:40:04 pc plasmashell[887]: couldn't find any notifier backend ("/usr/lib/qt/plugins")
Jan 07 11:40:04 pc akonadi_sendlater_agent[1368]: Using Wayland-EGL
Jan 07 11:40:04 pc plasmashell[887]: Empty filename passed to function
Jan 07 11:40:04 pc plasmashell[887]: Empty filename passed to function
Jan 07 11:40:04 pc akonadi_mailfilter_agent[1364]: Using Wayland-EGL
Jan 07 11:40:04 pc plasmashell[887]: kf5idletime_kwayland: This plugin does not support polling idle time
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/lib/qt/qml/QtQuick/Controls/Button.qml:99: TypeError: Cannot read property 'width' of null
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/lib/qt/qml/QtQuick/Controls/ScrollView.qml:365: TypeError: Cannot read property 'padding' of null
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/lib/qt/qml/QtQuick/Controls/ScrollView.qml:364: TypeError: Cannot read property 'padding' of null
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/lib/qt/qml/QtQuick/Controls/ScrollView.qml:363: TypeError: Cannot read property 'padding' of null
Jan 07 11:40:04 pc plasmashell[887]: file:///usr/lib/qt/qml/QtQuick/Controls/ScrollView.qml:362: TypeError: Cannot read property 'padding' of null
Jan 07 11:40:04 pc plasmashell[887]: libkcups: Create-Printer-Subscriptions last error: 1282 Ungültiger Dateideskriptor
Jan 07 11:40:04 pc plasmashell[887]: libkcups: Request failed 1282 -1
Jan 07 11:40:04 pc plasmashell[887]: libkcups: Get-Jobs last error: 1282 Ungültiger Dateideskriptor
Jan 07 11:40:04 pc plasmashell[887]: libkcups: Get-Jobs last error: 1282 Ungültiger Dateideskriptor
Jan 07 11:40:05 pc plasmashell[887]: Data set on unsupported clipboard mode. QMimeData object will be deleted.
Jan 07 11:40:05 pc plasmashell[887]: Plasma Shell startup completed
Jan 07 11:40:05 pc plasmashell[887]: Both point size and pixel size set. Using pixel size.
Jan 07 11:40:05 pc plasmashell[887]: trying to show an empty dialog
Jan 07 11:40:05 pc systemd-resolved[511]: Using degraded feature set (UDP) for DNS server 192.168.1.1.
Jan 07 11:40:05 pc plasmashell[887]: ktp-common-internals: Current presence changed
Jan 07 11:40:05 pc plasmashell[887]: ktp-common-internals: Current presence changed
Jan 07 11:40:05 pc kdeinit5[840]: org.kde.kmix: kmixd: Delayed initialization running now
Jan 07 11:40:05 pc kdeinit5[840]: org.kde.kmix: kmixd: Delayed initialization done
Jan 07 11:42:02 pc dbus-daemon[713]: [session uid=1000 pid=711] Failed to activate service 'org.freedesktop.Telepathy.Client.KTp.KdedIntegrationModule': timed out (service_start_timeout=120000ms)
Comment 1 Martin Flöser 2018-01-07 15:22:34 UTC 
Unfortunately (as always on Arch) the backtrace lacks debug symbols. Due to that the backtrace doesn't tell us anything except that it crashed.
Comment 2 Rainer Finke 2018-01-08 18:33:07 UTC 
Thank you for the feedback. I will compile Wayland with debug symbols and try to reproduce the same error.
Comment 3 Rainer Finke 2018-01-19 13:58:09 UTC 
I didn't see this issue on Plasma 5.12 beta. As it seems to be fixed, I will close the bug.
Comment 4 Andrew Crouthamel 2018-09-19 14:34:29 UTC 
This bug has had its resolution changed, but accidentally has been left in NEEDSINFO status. I am thus closing this bug and setting the status as RESOLVED to reflect the resolution change.