Version:            (using KDE KDE 3.5.6)
Installed from:    Gentoo Packages

Compiler Information:
Version: gcc-Version 4.1.1 (Gentoo 4.1.1-r3)
CFLAGS="-O2 -march=nocona -msse3 -pipe -fomit-frame-pointer"

A Konqueror instance running in the background crashed. I can't remember which site was opened.
Hope the backtrace helps:

Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1231377728 (LWP 9378)]
[KCrash handler]
#9  0xb70ca7d1 in QPixmap::convertToImage () from /usr/qt/3/lib/libqt-mt.so.3
#10 0xb77ecb57 in KWin::setIcons (win=75497477, icon=@0xbfdeda64, 
    miniIcon=@0xbfded9a8) at kwin.cpp:507
#11 0xb7ad1ee7 in KMainWindow::setIcon (this=0x8162388, p=@0xbfdeda64)
    at kmainwindow.cpp:1231
#12 0xb6799b53 in KonqMainWindow::setIcon (this=0x8162388, pix=@0xbfdeda64)
    at konq_mainwindow.cc:5287
#13 0xb6796589 in KonqMainWindow::setLocationBarURL (this=0x8162388, 
    url=@0x834d60c) at konq_mainwindow.cc:3603
#14 0xb676dd25 in KonqView::setLocationBarURL (this=0x834d5e0, 
    locationBarURL=@0xbfdedb08) at konq_view.cc:644
#15 0xb6775b8f in KonqViewManager::setActivePart (this=0x8187cc8, part=0x0, 
    immediate=true) at konq_viewmgr.cc:1356
#16 0xb6775cbf in KonqViewManager::clear (this=0x8187cc8)
    at konq_viewmgr.cc:917
#17 0xb67b3c43 in KonqMainWindow::stayPreloaded (this=0x8162388)
    at konq_mainwindow.cc:5764
#18 0xb67b3ff3 in KonqMainWindow::queryExit (this=0x8162388)
    at konq_mainwindow.cc:5282
#19 0xb7ad1370 in KMainWindow::shuttingDown (this=0x0) at kmainwindow.cpp:1104
#20 0xb7ad5a89 in KMainWindow::qt_invoke (this=0x8162388, _id=71, 
    _o=0xbfdedd38) at kmainwindow.moc:139
#21 0xb7f9e8eb in KParts::MainWindow::qt_invoke (this=0x8162388, _id=71, 
    _o=0xbfdedd38) at mainwindow.moc:98
#22 0xb67b96d9 in KonqMainWindow::qt_invoke (this=0x8162388, _id=71, 
    _o=0xbfdedd38) at konq_mainwindow.moc:746
#23 0xb7167f0e in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#24 0xb7168a48 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#25 0xb7786f3e in KApplication::shutDown (this=0xbfdee81c)
    at kapplication.moc:234
#26 0xb7787b4b in KApplication::xioErrhandler (this=0xbfdee81c, dpy=0x80d2688)
    at kapplication.cpp:726
#27 0xb7787b86 in kde_xio_errhandler (dpy=0x80d2688) at kapplication.cpp:179
#28 0xb6c5b07b in _XIOError () from /usr/lib/libX11.so.6
#29 0xb6c5b056 in _XIOError () from /usr/lib/libX11.so.6
#30 0xb6c5bfb4 in _XRead () from /usr/lib/libX11.so.6
#31 0x00000001 in ?? ()