Application: okular (0.19.3)
KDE Platform Version: 4.13.3
Qt Version: 4.8.6
Operating System: Linux 3.13.0-61-generic x86_64
Distribution: Peppermint Five

-- Information about the crash:
Restoring Okular from the task bar after changing Linux's theme in LXDE - What I was doing when the application crashed:

none; it just closed - Unusual behavior I noticed:

none - Custom settings of the application:

-- Backtrace:
Application: Okular (okular), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#5  0x00007fd83b83388b in IA__gtk_widget_set_direction (widget=0xfc86c0, dir=GTK_TEXT_DIR_LTR) at /build/buildd/gtk+2.0-2.24.23/gtk/gtkwidget.c:8672
#6  0x00007fd8477c246e in QGtkStyle::drawComplexControl (this=0xf8d640, control=<optimized out>, option=0x7ffe049f2af0, painter=0x7ffe049f2ad0, widget=0x138e160) at styles/qgtkstyle.cpp:1402
#7  0x00007fd84781f443 in drawComplexControl (opt=..., cc=QStyle::CC_ComboBox, this=0x7ffe049f2ad0) at ../../include/QtGui/../../src/gui/painting/qstylepainter.h:94
#8  QComboBox::paintEvent (this=0x138e160) at widgets/qcombobox.cpp:2813
#9  0x00007fd8474a6300 in QWidget::event (this=0x138e160, event=0x7ffe049f2f40) at kernel/qwidget.cpp:8533
#10 0x00007fd847456e2c in QApplicationPrivate::notify_helper (this=this@entry=0xf2a120, receiver=receiver@entry=0x138e160, e=e@entry=0x7ffe049f2f40) at kernel/qapplication.cpp:4567
#11 0x00007fd84745d4a0 in QApplication::notify (this=0x7ffe049f4750, receiver=0x138e160, e=0x7ffe049f2f40) at kernel/qapplication.cpp:4353
#12 0x00007fd848161d1a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#13 0x00007fd846a644dd in QCoreApplication::notifyInternal (this=0x7ffe049f4750, receiver=receiver@entry=0x138e160, event=event@entry=0x7ffe049f2f40) at kernel/qcoreapplication.cpp:953
#14 0x00007fd8474a0a21 in sendSpontaneousEvent (event=0x7ffe049f2f40, receiver=0x138e160) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#15 QWidgetPrivate::drawWidget (this=this@entry=0x138e1b0, pdev=pdev@entry=0x18adda0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5599
#16 0x00007fd8474a1450 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=<optimized out>, index@entry=19, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5808
#17 0x00007fd8474a12bf in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=19, index@entry=20, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5795
#18 0x00007fd8474a12bf in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=20, index@entry=22, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5795
#19 0x00007fd8474a12bf in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=22, index@entry=23, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5795
#20 0x00007fd8474a12bf in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=23, index@entry=24, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5795
#21 0x00007fd8474a12bf in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=24, index@entry=25, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5795
#22 0x00007fd8474a12bf in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, siblings=..., index=25, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5795
#23 0x00007fd8474a05dc in QWidgetPrivate::drawWidget (this=this@entry=0x134f240, pdev=pdev@entry=0x18adda0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5652
#24 0x00007fd8474a1450 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x11468a0, pdev=pdev@entry=0x18adda0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5808
#25 0x00007fd8474a05dc in QWidgetPrivate::drawWidget (this=0x11468a0, pdev=0x18adda0, rgn=..., offset=..., flags=flags@entry=5, sharedPainter=sharedPainter@entry=0x0, backingStore=backingStore@entry=0x13453f0) at kernel/qwidget.cpp:5652
#26 0x00007fd84766394e in QWidgetBackingStore::sync (this=this@entry=0x13453f0) at painting/qbackingstore.cpp:1373
#27 0x00007fd847663cc5 in QWidgetBackingStore::sync (this=0x13453f0, exposedWidget=0x134d210, exposedRegion=...) at painting/qbackingstore.cpp:1161
#28 0x00007fd847495f12 in QWidgetPrivate::syncBackingStore (this=this@entry=0x134f240, region=...) at kernel/qwidget.cpp:1903
#29 0x00007fd8474c1488 in QETWidget::translatePaintEvent (this=this@entry=0x134d210, event=event@entry=0x7ffe049f41e0) at kernel/qapplication_x11.cpp:5607
#30 0x00007fd8474d0d1b in QApplication::x11ProcessEvent (this=0x7ffe049f4750, event=event@entry=0x7ffe049f41e0) at kernel/qapplication_x11.cpp:3649
#31 0x00007fd8474f8b32 in x11EventSourceDispatch (s=0xf29f70, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#32 0x00007fd842c79e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007fd842c7a048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007fd842c7a0ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007fd846a917a1 in QEventDispatcherGlib::processEvents (this=0xeefb50, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#36 0x00007fd8474f8be6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#37 0x00007fd846a630af in QEventLoop::processEvents (this=this@entry=0x7ffe049f45b0, flags=...) at kernel/qeventloop.cpp:149
#38 0x00007fd846a633a5 in QEventLoop::exec (this=this@entry=0x7ffe049f45b0, flags=...) at kernel/qeventloop.cpp:204
#39 0x00007fd846a68b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#40 0x00007fd84745537c in QApplication::exec () at kernel/qapplication.cpp:3828
#41 0x00000000004099c6 in main (argc=<optimized out>, argv=<optimized out>) at ../../shell/main.cpp:174

Report to https://bugs.kde.org/

Reproducible: Didn't try