Bug 359189

Summary: Crash at login
Product: [Plasma] plasmashell Reporter: Ronny Standtke <Ronny.Standtke>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: crash CC: bshah, kxenator, plasma-bugs-null
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.5.3   
Target Milestone: 1.0   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Ronny Standtke 2016-02-09 16:39:24 UTC 
Application: plasmashell (5.5.3)

Qt Version: 5.5.1
Operating System: Linux 4.2.0-27-generic x86_64
Distribution: Ubuntu 15.10

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

I upgraded to the latest version of KDE and was greeted with this wonderful crash. I installed all debug packages I could possibly find and produced this nice backtrace. I hope it helps fixing some nasty bugs.

-- 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 0x7f56bdf3a7c0 (LWP 2130))]

Thread 8 (Thread 0x7f56aa200700 (LWP 2132)):
#0  0x00007f56b86428dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f56bc710bd2 in _xcb_conn_wait (__timeout=-1, __nfds=1, __fds=0x7f56aa1ffd00) at /usr/include/x86_64-linux-gnu/bits/poll2.h:46
#2  0x00007f56bc710bd2 in _xcb_conn_wait (c=c@entry=0xc1ffa0, cond=cond@entry=0xc1ffe0, vector=vector@entry=0x0, count=count@entry=0x0) at ../../src/xcb_conn.c:459
#3  0x00007f56bc71274f in xcb_wait_for_event (c=0xc1ffa0) at ../../src/xcb_in.c:623
#4  0x00007f56ac97b7e9 in QXcbEventReader::run() (this=0xc2e120) at qxcbconnection.cpp:1229
#5  0x00007f56b8d38a6e in QThreadPrivate::start(void*) (arg=0xc2e120) at thread/qthread_unix.cpp:331
#6  0x00007f56b7e246aa in start_thread (arg=0x7f56aa200700) at pthread_create.c:333
#7  0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7f56a33ea700 (LWP 2431)):
#0  0x00007f56b53d631b in g_source_iter_clear (iter=iter@entry=0x7f56a33e9c30) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:973
#1  0x00007f56b53d87f8 in g_main_context_prepare (context=context@entry=0x7f569c000990, priority=priority@entry=0x7f56a33e9cb0) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3505
#2  0x00007f56b53d911b in g_main_context_iterate (context=context@entry=0x7f569c000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3820
#3  0x00007f56b53d92fc in g_main_context_iteration (context=0x7f569c000990, may_block=may_block@entry=1) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3901
#4  0x00007f56b8f7050b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f569c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f56b8f1750a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f56a33e9de0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f56b8d33ac4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f56bb5e1c35 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f56b8d38a6e in QThreadPrivate::start(void*) (arg=0xcfc9b0) at thread/qthread_unix.cpp:331
#9  0x00007f56b7e246aa in start_thread (arg=0x7f56a33ea700) at pthread_create.c:333
#10 0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7f5696785700 (LWP 2445)):
#0  0x00007f56b86428dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f56b53d91ec in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f5690002e70, timeout=<optimized out>, context=0x7f5690000990) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:4135
#2  0x00007f56b53d91ec in g_main_context_iterate (context=context@entry=0x7f5690000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3835
#3  0x00007f56b53d92fc in g_main_context_iteration (context=0x7f5690000990, may_block=may_block@entry=1) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3901
#4  0x00007f56b8f7050b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f56900008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f56b8f1750a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f5696784de0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f56b8d33ac4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f56bb5e1c35 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f56b8d38a6e in QThreadPrivate::start(void*) (arg=0xde9360) at thread/qthread_unix.cpp:331
#9  0x00007f56b7e246aa in start_thread (arg=0x7f5696785700) at pthread_create.c:333
#10 0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7f56949d5700 (LWP 2469)):
#0  0x00007f56b53d87f8 in g_main_context_prepare (context=context@entry=0x7f5688000990, priority=priority@entry=0x7f56949d4cb0) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3507
#1  0x00007f56b53d911b in g_main_context_iterate (context=context@entry=0x7f5688000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3820
#2  0x00007f56b53d92fc in g_main_context_iteration (context=0x7f5688000990, may_block=may_block@entry=1) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3901
#3  0x00007f56b8f7050b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f56880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f56b8f1750a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f56949d4de0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f56b8d33ac4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f56bb5e1c35 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f56b8d38a6e in QThreadPrivate::start(void*) (arg=0x1213090) at thread/qthread_unix.cpp:331
#8  0x00007f56b7e246aa in start_thread (arg=0x7f56949d5700) at pthread_create.c:333
#9  0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f568efbc700 (LWP 2471)):
#0  0x00007f56b7e29da0 in pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f56bd98a194 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007f56bd98a1d9 in  () at /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007f56b7e246aa in start_thread (arg=0x7f568efbc700) at pthread_create.c:333
#4  0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f5607fff700 (LWP 2484)):
#0  0x00007f56b86428dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f56b53d91ec in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f5600003120, timeout=<optimized out>, context=0x7f5600000990) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:4135
#2  0x00007f56b53d91ec in g_main_context_iterate (context=context@entry=0x7f5600000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3835
#3  0x00007f56b53d92fc in g_main_context_iteration (context=0x7f5600000990, may_block=may_block@entry=1) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3901
#4  0x00007f56b8f7050b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f56000008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f56b8f1750a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f5607ffed90, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f56b8d33ac4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f56bbf6a2a6 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f56b8d38a6e in QThreadPrivate::start(void*) (arg=0x14a7b80) at thread/qthread_unix.cpp:331
#9  0x00007f56b7e246aa in start_thread (arg=0x7f5607fff700) at pthread_create.c:333
#10 0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f55ea98a700 (LWP 2501)):
#0  0x00007f56b86428dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f56b53d91ec in g_main_context_iterate (priority=2147483647, n_fds=1, fds=0x7f55e40048c0, timeout=<optimized out>, context=0x7f55e4000990) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:4135
#2  0x00007f56b53d91ec in g_main_context_iterate (context=context@entry=0x7f55e4000990, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3835
#3  0x00007f56b53d92fc in g_main_context_iteration (context=0x7f55e4000990, may_block=may_block@entry=1) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3901
#4  0x00007f56b8f7050b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f55e40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#5  0x00007f56b8f1750a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f55ea989dc0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f56b8d33ac4 in QThread::exec() (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f55f0ccf8f7 in KCupsConnection::run() () at /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007f56b8d38a6e in QThreadPrivate::start(void*) (arg=0x2204660) at thread/qthread_unix.cpp:331
#9  0x00007f56b7e246aa in start_thread (arg=0x7f55ea98a700) at pthread_create.c:333
#10 0x00007f56b864deed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f56bdf3a7c0 (LWP 2130)):
[KCrash Handler]
#6  0x00007f56b92825e0 in QScreen::refreshRate() const (this=0x0) at kernel/qscreen.cpp:463
#7  0x00007f56bbfdbf38 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f56bbfdc063 in  () at /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f56b8f488ea in QMetaObject::activate(QObject*, int, int, void**) (sender=0xe578b0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3713
#10 0x00007f56b8d10105 in QUnifiedTimer::startAnimationDriver() (this=<optimized out>) at animation/qabstractanimation.cpp:279
#11 0x00007f56b8f49763 in QObject::event(QEvent*) (this=0xe6b890, e=<optimized out>) at kernel/qobject.cpp:1261
#12 0x00007f56b9a1e9dc in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0xc12c90, receiver=receiver@entry=0xe6b890, e=e@entry=0x7ffd29b452a0) at kernel/qapplication.cpp:3716
#13 0x00007f56b9a23ea6 in QApplication::notify(QObject*, QEvent*) (this=0x7ffd29b45640, receiver=0xe6b890, e=0x7ffd29b452a0) at kernel/qapplication.cpp:3499
#14 0x00007f56b8f19d7b in QCoreApplication::notifyInternal(QObject*, QEvent*) (this=0x7ffd29b45640, receiver=0xe6b890, event=event@entry=0x7ffd29b452a0) at kernel/qcoreapplication.cpp:965
#15 0x00007f56b8f6f30d in QTimerInfoList::activateTimers() (event=0x7ffd29b452a0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#16 0x00007f56b8f6f30d in QTimerInfoList::activateTimers() (this=0xc08800) at kernel/qtimerinfo_unix.cpp:637
#17 0x00007f56b8f6f811 in timerSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:177
#18 0x00007f56b53d8ff7 in g_main_context_dispatch (context=0x7f56a40016f0) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3154
#19 0x00007f56b53d8ff7 in g_main_context_dispatch (context=context@entry=0x7f56a40016f0) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3769
#20 0x00007f56b53d9250 in g_main_context_iterate (context=context@entry=0x7f56a40016f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3840
#21 0x00007f56b53d92fc in g_main_context_iteration (context=0x7f56a40016f0, may_block=may_block@entry=1) at /build/glib2.0-ajuDY6/glib2.0-2.46.1/./glib/gmain.c:3901
#22 0x00007f56b8f704ef in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0xc57a80, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#23 0x00007f56b8f1750a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffd29b454e0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#24 0x00007f56b8f1f5ec in QCoreApplication::exec() () at kernel/qcoreapplication.cpp:1229
#25 0x00007f56b9253d1c in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1530
#26 0x00007f56b9a1ae15 in QApplication::exec() () at kernel/qapplication.cpp:2976
#27 0x000000000043258a in main(int, char**) (argc=2, argv=<optimized out>) at ../../shell/main.cpp:179

Reported using DrKonqi
Comment 1 Ronny Standtke 2016-02-09 17:16:53 UTC 
I just noticed that this crash always happens when I switch the external monitor (connected via HDMI) off and on again. I don't know if it happens when switching off or on because I just don't see anything on the screen when I switch the monitor off. :-)
I just see it everytime I switch the monitor on again. This is significantly reducing the WAF of KDE on this machine.
Comment 2 Marco Martin 2016-02-24 13:42:36 UTC 
*** Bug 354596 has been marked as a duplicate of this bug. ***
Comment 3 David Edmundson 2016-02-25 00:12:43 UTC 

*** This bug has been marked as a duplicate of bug 356394 ***