Version:           tuntematon (using KDE 3.1.94 (CVS >= 20031206), compiled sources)
Compiler:          gcc version 3.2.3 (Debian)
OS:          Linux (i686) release 2.6.0-test11

Just double clicked the location bar and it gone down. I can't reproduce this, but maybe the backtrace helps?

Here:
[New Thread 1099277568 (LWP 3541)]
0x414f130e in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#0  0x414f130e in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#1  0x407b23ad in KCrash::defaultCrashHandler(int) (sig=11) at kcrash.cpp:246
#2  <signal handler called>
#3  0x08051486 in QShared::ref() (this=0x340000) at qshared.h:49
#4  0x410605ae in QString (this=0xbfffe620, s=@0x4000001a)
    at tools/qstring.cpp:1372
#5  0x4077dcae in KIconEffect::fingerprint(int, int) const (this=0x839e89c, 
    group=2, state=0) at kiconeffect.cpp:139
#6  0x4078b335 in KIconFactory::createPixmap(QIconSet const&, QIconSet::Size, QIconSet::Mode, QIconSet::State) (this=0x85829d0, mode_P=3407872)
    at kiconloader.cpp:1169
#7  0x40cbbc83 in QIconSetPrivate::icon(QIconSet const*, QIconSet::Size, QIconSet::Mode, QIconSet::State) (this=0x83e1590, iconSet=0xbfffe8f0, size=Small, 
    mode=Active, state=Off) at kernel/qiconset.cpp:195
#8  0x40cbc49a in QIconSet::pixmap(QIconSet::Size, QIconSet::Mode, QIconSet::State) const (this=0xbfffe8f0, size=Small, mode=Active, state=Off)
    at kernel/qiconset.cpp:520
#9  0x40584bba in KToolBarButton::drawButton(QPainter*) (this=0x8563c08, 
    _painter=0x8381630) at ktoolbarbutton.cpp:474
#10 0x40dafd68 in QButton::paintEvent(QPaintEvent*) (this=0x8563c08)
    at widgets/qbutton.cpp:870
#11 0x40d42857 in QWidget::event(QEvent*) (this=0x8563c08, e=0xbfffec50)
    at kernel/qwidget.cpp:4529
#12 0x40c8dbe7 in QApplication::internalNotify(QObject*, QEvent*) (
    this=0xbffff5c0, receiver=0x8563c08, e=0xbfffec50)
    at kernel/qapplication.cpp:2582
#13 0x40c8d7f6 in QApplication::notify(QObject*, QEvent*) (this=0xbffff5c0, 
    receiver=0x8563c08, e=0xbfffec50) at kernel/qapplication.cpp:2470
#14 0x4072be99 in KApplication::notify(QObject*, QEvent*) (this=0xbffff5c0, 
    receiver=0x8563c08, event=0xbfffec50) at kapplication.cpp:509
#15 0x4004c0c5 in QApplication::sendEvent(QObject*, QEvent*) (
    receiver=0xbfffe620, event=0xbfffe620) at qapplication.h:492
#16 0x40c4fabb in QWidget::repaint(int, int, int, int, bool) (this=0x8563c08, 
    x=0, y=0, w=28, h=27, erase=false) at kernel/qwidget_x11.cpp:1486
#17 0x40505c65 in QWidget::repaint(QRect const&, bool) (this=0x340000, 
    r=@0xbfffed00, erase=false) at qwidget.h:813
#18 0x40d440cc in QWidget::repaint(bool) (this=0x8563c08, erase=false)
    at kernel/qwidget.cpp:5825
#19 0x40583b9b in KToolBarButton::enterEvent(QEvent*) (this=0x8563c08)
    at ktoolbarbutton.cpp:398
#20 0x40d42819 in QWidget::event(QEvent*) (this=0x8563c08, e=0xbfffefc0)
    at kernel/qwidget.cpp:4518
#21 0x40c8dbe7 in QApplication::internalNotify(QObject*, QEvent*) (
    this=0xbffff5c0, receiver=0x8563c08, e=0xbfffefc0)
    at kernel/qapplication.cpp:2582
#22 0x40c8d7f6 in QApplication::notify(QObject*, QEvent*) (this=0xbffff5c0, 
    receiver=0x8563c08, e=0xbfffefc0) at kernel/qapplication.cpp:2470
#23 0x4072be99 in KApplication::notify(QObject*, QEvent*) (this=0xbffff5c0, 
    receiver=0x8563c08, event=0xbfffefc0) at kapplication.cpp:509
#24 0x4004c0c5 in QApplication::sendEvent(QObject*, QEvent*) (
    receiver=0xbfffe620, event=0xbfffe620) at qapplication.h:492
#25 0x40c8fc68 in qt_dispatchEnterLeave(QWidget*, QWidget*) (enter=0x8563c08, 
    leave=0x82953a0) at kernel/qapplication.cpp:3551
#26 0x40c0d5ca in QApplication::x11ProcessEvent(_XEvent*) (this=0xbffff5c0, 
    event=0xbffff2b0) at kernel/qapplication_x11.cpp:3762
#27 0x40c29a96 in QEventLoop::processEvents(unsigned) (this=0x8134938, flags=4)
    at kernel/qeventloop_x11.cpp:192
#28 0x40ca6f5e in QEventLoop::enterLoop() (this=0x8134938)
    at kernel/qeventloop.cpp:198
#29 0x40ca6e7a in QEventLoop::exec() (this=0x8134938)
    at kernel/qeventloop.cpp:145
#30 0x40c8ddb9 in QApplication::exec() (this=0xbffff5c0)
    at kernel/qapplication.cpp:2705
#31 0x419436a0 in kdemain (argc=3407872, argv=0x340000) at konq_main.cc:177
#32 0x409178b6 in kdeinitmain ()
   from /home/tpr/kdecvshead/lib/kde3/konqueror.so
#33 0x0804def3 in launch (argc=2, _name=0x8061574 "konqueror", 
    args=0x8061588 "\001", cwd=0x0, envc=1, envs=0x8061599 "", 
    reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x340000 <Address 0x340000 out of bounds>) at kinit.cpp:604
#34 0x0804ee71 in handle_launcher_request (sock=8) at kinit.cpp:1167
#35 0x0804f3ff in handle_requests (waitForPid=0) at kinit.cpp:1360
#36 0x080503c5 in main (argc=3, argv=0xbffffc14, envp=0x340000)
    at kinit.cpp:1797