Application that crashed: konqueror
Version of the application: 4.3.2 (KDE 4.3.2)
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-16-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Copied directory and a file to a network drive (CIFS, mounted via /etc/fstab). Got an error message saying "could not change permissions of file", when clicking the OK button the file manager (both Konqueror and Dolphin) crashes. Have reproduced the bug on two seperate machines.

 -- Backtrace:
Application: Konqueror (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0x002d0f4d in KIO::Slave::deref() () from /usr/lib/libkio.so.5
#7  0x002d1af6 in KIO::Slave::gotInput() () from /usr/lib/libkio.so.5
#8  0x002d3ee3 in KIO::Slave::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#9  0x00ab9263 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#10 0x00ab9ec2 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#11 0x001dbf97 in KIO::Connection::readyRead() () from /usr/lib/libkio.so.5
#12 0x001ddd5e in ?? () from /usr/lib/libkio.so.5
#13 0x001dde8e in KIO::Connection::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkio.so.5
#14 0x00ab1f0b in QMetaCallEvent::placeMetaCall(QObject*) () from /usr/lib/libQtCore.so.4
#15 0x00ab35fe in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#16 0x081def54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x081e667c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#18 0x01138bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#19 0x00aa36cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#20 0x00aa42b2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#21 0x00aa447d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#22 0x00ace3ff in ?? () from /usr/lib/libQtCore.so.4
#23 0x00c59e78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#24 0x00c5d720 in ?? () from /lib/libglib-2.0.so.0
#25 0x00c5d853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#26 0x00ace02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0x0827fbe5 in ?? () from /usr/lib/libQtGui.so.4
#28 0x00aa1c79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0x00aa20ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x00aa453f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0x081dedd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#32 0x07b0f59f in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#33 0x0804dde1 in _start ()

Reported using DrKonqi