Bug 362637

Application: dolphin (15.12.3)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-21-generic x86_64
Distribution: Ubuntu 16.04 LTS

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

Clicked the window to activate it. Also happened when accessing a dolphin window via Alt-Tab. Seems to happen more often, the older the window gets with windows that were open when the computer went to sleep being the most likely to crash. This is, however, not guaranteed and neither are windows safe from crashing before going to sleep.

I have not yet observed a clear pattern but it started with the recent major kubuntu upgrade.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f01e87b08c0 (LWP 1374))]

Thread 2 (Thread 0x7f01dbf2e700 (LWP 1376)):
#0  0x00007f01fb5cee8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007f01f1dc331c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f01f1dc342c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f01f63d7a9b in QEventDispatcherGlib::processEvents (this=0x7f01d40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:420
#4  0x00007f01f637edea in QEventLoop::exec (this=this@entry=0x7f01dbf2dd00, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#5  0x00007f01f619b8a4 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#6  0x00007f01f61a084e in QThreadPrivate::start (arg=0x156db20) at thread/qthread_unix.cpp:331
#7  0x00007f01f294e6fa in start_thread (arg=0x7f01dbf2e700) at pthread_create.c:333
#8  0x00007f01fb5dab5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f01e87b08c0 (LWP 1374)):
[KCrash Handler]
#6  0x00007f01f65c5088 in typeinfo for QSequentialAnimationGroupPrivate () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f01e828d684 in QXcbWindow::mapToNative (this=<optimized out>, rect=..., screen=0x1043910) at qxcbwindow.cpp:198
#8  0x00007f01e8293f43 in QXcbWindow::setGeometry (this=0x1867d90, rect=...) at qxcbwindow.cpp:715
#9  0x00007f01f6eba652 in QWidgetPrivate::show_sys (this=this@entry=0x1509b70) at kernel/qwidget.cpp:7886
#10 0x00007f01f6ec3a8e in QWidgetPrivate::show_helper (this=this@entry=0x1509b70) at kernel/qwidget.cpp:7824
#11 0x00007f01f6ec65fd in QWidget::setVisible (this=0x150ac30, visible=<optimized out>) at kernel/qwidget.cpp:8108
#12 0x00007f01e4e4c0d6 in Breeze::SplitterProxy::setSplitter (this=0x150ac30, widget=<optimized out>) at /build/breeze-FJR9bu/breeze-5.5.5/kstyle/breezesplitterproxy.cpp:320
#13 0x00007f01e4e4d0f2 in Breeze::SplitterProxy::eventFilter (this=0x150ac30, object=<optimized out>, event=<optimized out>) at /build/breeze-FJR9bu/breeze-5.5.5/kstyle/breezesplitterproxy.cpp:177
#14 0x00007f01f6381412 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x10293e0, receiver=receiver@entry=0x11043c0, event=event@entry=0x7ffdb7a280c0) at kernel/qcoreapplication.cpp:1072
#15 0x00007f01f6e8403c in QApplicationPrivate::notify_helper (this=this@entry=0x10293e0, receiver=receiver@entry=0x11043c0, e=e@entry=0x7ffdb7a280c0) at kernel/qapplication.cpp:3712
#16 0x00007f01f6e89516 in QApplication::notify (this=0x7ffdb7a28ed0, receiver=0x11043c0, e=0x7ffdb7a280c0) at kernel/qapplication.cpp:3499
#17 0x00007f01f638162b in QCoreApplication::notifyInternal (this=0x7ffdb7a28ed0, receiver=receiver@entry=0x11043c0, event=event@entry=0x7ffdb7a280c0) at kernel/qcoreapplication.cpp:965
#18 0x00007f01f6ebc883 in QCoreApplication::sendEvent (event=0x7ffdb7a280c0, receiver=0x11043c0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#19 QWidget::setCursor (this=this@entry=0x11043c0, cursor=...) at kernel/qwidget.cpp:4942
#20 0x00007f01f6fdc6b5 in QMainWindowPrivate::adjustCursor (this=this@entry=0x109fdf0, pos=...) at widgets/qmainwindow.cpp:1353
#21 0x00007f01f6fdceff in QMainWindow::event (this=this@entry=0x11043c0, event=event@entry=0x7ffdb7a28370) at widgets/qmainwindow.cpp:1377
#22 0x00007f01f8ed3147 in KMainWindow::event (this=this@entry=0x11043c0, ev=ev@entry=0x7ffdb7a28370) at ../../src/kmainwindow.cpp:829
#23 0x00007f01f8f0b4e5 in KXmlGuiWindow::event (this=0x11043c0, ev=0x7ffdb7a28370) at ../../src/kxmlguiwindow.cpp:118
#24 0x00007f01f6e8405c in QApplicationPrivate::notify_helper (this=this@entry=0x10293e0, receiver=receiver@entry=0x11043c0, e=e@entry=0x7ffdb7a28370) at kernel/qapplication.cpp:3716
#25 0x00007f01f6e8ae26 in QApplication::notify (this=<optimized out>, receiver=<optimized out>, e=0x7ffdb7a28610) at kernel/qapplication.cpp:3301
#26 0x00007f01f638162b in QCoreApplication::notifyInternal (this=0x7ffdb7a28ed0, receiver=receiver@entry=0x1319110, event=event@entry=0x7ffdb7a28610) at kernel/qcoreapplication.cpp:965
#27 0x00007f01f6e88b32 in QCoreApplication::sendSpontaneousEvent (event=0x7ffdb7a28610, receiver=0x1319110) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#28 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x1319110, event=event@entry=0x7ffdb7a28610, alienWidget=alienWidget@entry=0x1319110, nativeWidget=0x13115e0, buttonDown=buttonDown@entry=0x7f01f73b4b20 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2770
#29 0x00007f01f6ee157b in QWidgetWindow::handleMouseEvent (this=this@entry=0x1870400, event=event@entry=0x7ffdb7a28a20) at kernel/qwidgetwindow.cpp:555
#30 0x00007f01f6ee3b3b in QWidgetWindow::event (this=0x1870400, event=0x7ffdb7a28a20) at kernel/qwidgetwindow.cpp:210
#31 0x00007f01f6e8405c in QApplicationPrivate::notify_helper (this=this@entry=0x10293e0, receiver=receiver@entry=0x1870400, e=e@entry=0x7ffdb7a28a20) at kernel/qapplication.cpp:3716
#32 0x00007f01f6e89516 in QApplication::notify (this=0x7ffdb7a28ed0, receiver=0x1870400, e=0x7ffdb7a28a20) at kernel/qapplication.cpp:3499
#33 0x00007f01f638162b in QCoreApplication::notifyInternal (this=0x7ffdb7a28ed0, receiver=receiver@entry=0x1870400, event=event@entry=0x7ffdb7a28a20) at kernel/qcoreapplication.cpp:965
#34 0x00007f01f68d3521 in QCoreApplication::sendSpontaneousEvent (event=0x7ffdb7a28a20, receiver=0x1870400) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:227
#35 QGuiApplicationPrivate::processMouseEvent (e=0x1c97970) at kernel/qguiapplication.cpp:1804
#36 0x00007f01f68d51e5 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x1c97970) at kernel/qguiapplication.cpp:1596
#37 0x00007f01f68b8f38 in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:625
#38 0x00007f01e82a8f10 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#39 0x00007f01f1dc3127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#40 0x00007f01f1dc3380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007f01f1dc342c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007f01f63d7a7f in QEventDispatcherGlib::processEvents (this=0x105f590, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#43 0x00007f01f637edea in QEventLoop::exec (this=this@entry=0x7ffdb7a28da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#44 0x00007f01f6386e8c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1229
#45 0x00007f01f68cac3c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1542
#46 0x00007f01f6e80495 in QApplication::exec () at kernel/qapplication.cpp:2976
#47 0x00007f01fb8fae2b in kdemain (argc=1, argv=<optimized out>) at /build/dolphin-HvGmRr/dolphin-15.12.3/src/main.cpp:150
#48 0x00007f01fb4f4830 in __libc_start_main (main=0x400710 <main(int, char**)>, argc=1, argv=0x7ffdb7a29058, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdb7a29048) at ../csu/libc-start.c:291
#49 0x0000000000400749 in _start ()

Reported using DrKonqi