Hi,
so far I haven't found a way to reproduce this outside a relatively
large application (it works perfectly with Qt 4.4.x), but the gdb
backtrace looks interesting enough to possibly be of help even
without a small testcase:
Program received signal SIGSEGV, Segmentation fault.
0x000000367d280d00 in strlen () from /lib64/libc.so.6
(gdb) bt
#0 0x000000367d280d00 in strlen () from /lib64/libc.so.6
#1 0x00007ffe2a85f7f3 in XSetCommand () from
/usr/lib64/libX11.so.6
#2 0x00007ffe2a864459 in XSetWMProperties () from
/usr/lib64/libX11.so.6
#3 0x00007ffe2e49aec7 in QWidgetPrivate::create_sys () from
/usr/lib64/libQtGui.so.4
#4 0x00007ffe2e4631fa in QWidget::create () from
/usr/lib64/libQtGui.so.4
#5 0x00007ffe2e468b32 in QWidget::setVisible () from
/usr/lib64/libQtGui.so.4
#6 0x000000000045b514 in PopupWindow::popup (this=0x11cfd40)
at /usr/lib64/qt4/include/QtGui/qwidget.h:475
#7 0x0000000000432190 in BookView::qt_metacall (this=0xa75290,
_c=QMetaObject::InvokeMetaMethod, _id=33,
_a=0x7fff372204a0) at BookView.moc:119
#8 0x00007ffe2ef45a76 in QMetaObject::activate () from
/usr/lib64/libQtCore.so.4
#9 0x00007ffe2e40cb87 in QAction::triggered () from
/usr/lib64/libQtGui.so.4
#10 0x00007ffe2e40e030 in QAction::activate () from
/usr/lib64/libQtGui.so.4
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