Bug 363248

Application: systemsettings5 (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-22-generic x86_64
Distribution: Ubuntu 16.04 LTS

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

Going through one by one changing options under System Settings. I believe I got down to the Compositor setting, I did not change any settings here. I hit alt+ctrl+F1 to check something and when I hit alt+ctrl+F7 to come back to desktop, System Settings was gone and in its place was a crashed message.

Kubuntu 16.04

The crash can be reproduced sometimes.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f047e2cd900 (LWP 18653))]

Thread 4 (Thread 0x7f046c025700 (LWP 18654)):
#0  0x00007f047a9e6e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f04786cec62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f04786d08d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f046e9a9629 in QXcbEventReader::run (this=0xce8a10) at qxcbconnection.cpp:1253
#4  0x00007f047b0dc84e in QThreadPrivate::start (arg=0xce8a10) at thread/qthread_unix.cpp:331
#5  0x00007f0477e586fa in start_thread (arg=0x7f046c025700) at pthread_create.c:333
#6  0x00007f047a9f2b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f045ab1f700 (LWP 18656)):
#0  0x00007f047a9e29cd in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f04736bb073 in ?? () from /usr/lib/x86_64-linux-gnu/tls/libnvidia-tls.so.361.42
#2  0x00007f047797a6c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f0477936e04 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f04779372c0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f047793742c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f0477937469 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f047795db45 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f0477e586fa in start_thread (arg=0x7f045ab1f700) at pthread_create.c:333
#9  0x00007f047a9f2b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f045a31e700 (LWP 18657)):
#0  0x00007f047a9e6e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f047793731c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f04779376a2 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f045bddb906 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f047795db45 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f0477e586fa in start_thread (arg=0x7f045a31e700) at pthread_create.c:333
#6  0x00007f047a9f2b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f047e2cd900 (LWP 18653)):
[KCrash Handler]
#6  0x00007f04786d06cc in xcb_wait_for_reply () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#7  0x00007f0442c672bc in XcbAtom::atom (this=this@entry=0x12a31b0) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/kcms/touchpad/src/backends/x11/xcbatom.cpp:49
#8  0x00007f0442c683ed in XlibBackend::findTouchpad (this=this@entry=0x12a3150, identifier=...) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/kcms/touchpad/src/backends/x11/xlibbackend.cpp:378
#9  0x00007f0442c68871 in XlibBackend::devicePlugged (this=0x12a3150, device=8) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/kcms/touchpad/src/backends/x11/xlibbackend.cpp:703
#10 0x00007f047b2ebfca in QMetaObject::activate (sender=sender@entry=0x4c6f420, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffc61230930) at kernel/qobject.cpp:3713
#11 0x00007f047b2ec7d7 in QMetaObject::activate (sender=sender@entry=0x4c6f420, m=m@entry=0x7f0442e81be0 <XlibNotifications::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffc61230930) at kernel/qobject.cpp:3578
#12 0x00007f0442c70664 in XlibNotifications::devicePlugged (_t1=8, this=0x4c6f420) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/obj-x86_64-linux-gnu/kcms/touchpad/src/moc_xlibnotifications.cpp:162
#13 XlibNotifications::processEvent (this=this@entry=0x4c6f420, event=event@entry=0x7ffc61230990) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/kcms/touchpad/src/backends/x11/xlibnotifications.cpp:144
#14 0x00007f0442c7093c in XlibNotifications::processEvent (event=0x7ffc61230990, this=0x4c6f420) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/kcms/touchpad/src/backends/x11/xlibnotifications.cpp:110
#15 XlibNotifications::processEvents (this=this@entry=0x4c6f420) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/kcms/touchpad/src/backends/x11/xlibnotifications.cpp:82
#16 0x00007f0442c709ba in XlibNotifications::qt_static_metacall (_o=_o@entry=0x4c6f420, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=3, _a=_a@entry=0x7ffc61230bd0) at /build/plasma-desktop-Bvo2Ad/plasma-desktop-5.5.5/obj-x86_64-linux-gnu/kcms/touchpad/src/moc_xlibnotifications.cpp:88
#17 0x00007f047b2ebfca in QMetaObject::activate (sender=sender@entry=0x4ce2120, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc61230bd0) at kernel/qobject.cpp:3713
#18 0x00007f047b2ec7d7 in QMetaObject::activate (sender=sender@entry=0x4ce2120, m=m@entry=0x7f047b506780 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc61230bd0) at kernel/qobject.cpp:3578
#19 0x00007f047b36b51e in QSocketNotifier::activated (this=this@entry=0x4ce2120, _t1=12) at .moc/moc_qsocketnotifier.cpp:134
#20 0x00007f047b2f847b in QSocketNotifier::event (this=0x4ce2120, e=<optimized out>) at kernel/qsocketnotifier.cpp:260
#21 0x00007f047c79005c in QApplicationPrivate::notify_helper (this=this@entry=0xcbd240, receiver=receiver@entry=0x4ce2120, e=e@entry=0x7ffc61230e40) at kernel/qapplication.cpp:3716
#22 0x00007f047c795516 in QApplication::notify (this=0x7ffc61231170, receiver=0x4ce2120, e=0x7ffc61230e40) at kernel/qapplication.cpp:3499
#23 0x00007f047b2bd62b in QCoreApplication::notifyInternal (this=0x7ffc61231170, receiver=0x4ce2120, event=event@entry=0x7ffc61230e40) at kernel/qcoreapplication.cpp:965
#24 0x00007f047b313f45 in QCoreApplication::sendEvent (event=0x7ffc61230e40, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#25 socketNotifierSourceDispatch (source=0xd42160) at kernel/qeventdispatcher_glib.cpp:101
#26 0x00007f0477937127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f0477937380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f047793742c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f047b313a7f in QEventDispatcherGlib::processEvents (this=0xd24e30, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#30 0x00007f047b2badea in QEventLoop::exec (this=this@entry=0x7ffc61231050, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#31 0x00007f047b2c2e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#32 0x000000000040f7a1 in main ()

Possible duplicates by query: bug 350271.

Reported using DrKonqi