Version:           3.5.5 (using KDE 3.5.5, Debian Package 4:3.5.5a.dfsg.1-6 (4.0))
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.18-4-686

I was just surfing the web (don't remember exactly where I was) when konqueror crashed with a backtrace. Here it is:

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1232504608 (LWP 24278)]
[KCrash handler]
#5  0xb68cde24 in pthread_mutex_lock () from /lib/tls/libpthread.so.0
#6  0xb7d73576 in pthread_mutex_lock () from /lib/tls/libc.so.6
#7  0xb6e87f8f in XInitThreads () from /usr/lib/libX11.so.6
#8  0xb6ea2cbe in XrmQGetResource () from /usr/lib/libX11.so.6
#9  0xb6ea3728 in XrmGetResource () from /usr/lib/libX11.so.6
#10 0xb6e7a01a in XGetErrorDatabaseText () from /usr/lib/libX11.so.6
#11 0xb6e7a32b in XGetErrorText () from /usr/lib/libX11.so.6
#12 0xb716dd94 in qt_x_errhandler (dpy=0x80a2320, err=0xbfc2bc5c)
    at kernel/qapplication_x11.cpp:755
#13 0xb77f0df7 in KApplication::xErrhandler (this=0xbfc2cc9c, dpy=0x80a2320, 
    err_=0xbfc2bc5c)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kdecore/kapplication.cpp:744
#14 0xb77f0e30 in kde_x_errhandler (dpy=0x80a2320, err=0xbfc2bc5c)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kdecore/kapplication.cpp:184
#15 0xb6e9d1cf in _XError () from /usr/lib/libX11.so.6
#16 0xb6e9edab in _XReply () from /usr/lib/libX11.so.6
#17 0xb6e96098 in XSync () from /usr/lib/libX11.so.6
#18 0xb6c8a866 in ~QXEmbed (this=0x905e270)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kdeui/qxembed.cpp:698
#19 0xb5a6dde3 in NSPluginInstance::~NSPluginInstance ()
   from /usr/lib/kde3/libnsplugin.so
#20 0xb728aa4b in ~QWidget (this=0x8835f68) at kernel/qwidget.cpp:973
#21 0xb5a71335 in PluginCanvasWidget::~PluginCanvasWidget ()
   from /usr/lib/kde3/libnsplugin.so
#22 0xb728aa4b in ~QWidget (this=0x8798bd0) at kernel/qwidget.cpp:973
#23 0xb7386ad3 in ~QClipperWidget (this=0x8798bd0)
    at widgets/qscrollview.cpp:109
#24 0xb728aa4b in ~QWidget (this=0x8741950) at kernel/qwidget.cpp:973
#25 0xb7386a13 in ~QViewportWidget (this=0x8741950)
    at widgets/qscrollview.cpp:100
#26 0xb7383c48 in ~QScrollView (this=0x85a35b8) at widgets/qscrollview.cpp:630
#27 0xb5dce86b in ~KHTMLView (this=0x85a35b8)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./khtml/khtmlview.cpp:520
#28 0xb7f07490 in ~Part (this=0x85ba078, __vtt_parm=0xb602b6e8)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kparts/part.cpp:159
#29 0xb7f0cb6d in ~ReadOnlyPart (this=0x85ba078, __vtt_parm=0xb602b6e4)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kparts/part.cpp:314
#30 0xb5dcdfb9 in ~KHTMLPart (this=0x85ba078)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./khtml/khtml_part.cpp:524
#31 0xb65c79ce in KonqView::~KonqView () from /usr/lib/libkdeinit_konqueror.so
#32 0xb6612fd0 in KonqViewManager::removeTab ()
   from /usr/lib/libkdeinit_konqueror.so
#33 0xb66131e4 in KonqMainWindow::slotRemoveTab ()
   from /usr/lib/libkdeinit_konqueror.so
#34 0xb66168f8 in KonqMainWindow::qt_invoke ()
   from /usr/lib/libkdeinit_konqueror.so
#35 0xb724dd4f in QObject::activate_signal (this=0x828d928, clist=0x850d498, 
    o=0xbfc2c1ac) at kernel/qobject.cpp:2356
#36 0xb724e7e0 in QObject::activate_signal (this=0x828d928, signal=4)
    at kernel/qobject.cpp:2325
#37 0xb75dfde7 in QButton::clicked (this=0x828d928)
    at .moc/debug-shared-mt/moc_qbutton.cpp:152
#38 0xb72eacf6 in QButton::mouseReleaseEvent (this=0x828d928, e=0xbfc2c614)
    at widgets/qbutton.cpp:836
#39 0xb72846f0 in QWidget::event (this=0x828d928, e=0xbfc2c614)
    at kernel/qwidget.cpp:4702
#40 0xb71e5c26 in QApplication::internalNotify (this=0xbfc2cc9c, 
    receiver=0x828d928, e=0xbfc2c614) at kernel/qapplication.cpp:2635
#41 0xb71e7dc9 in QApplication::notify (this=0xbfc2cc9c, receiver=0x828d928, 
    e=0xbfc2c614) at kernel/qapplication.cpp:2421
#42 0xb78dbe0e in KApplication::notify (this=0xbfc2cc9c, receiver=0x828d928, 
    event=0xbfc2c614)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kdecore/kapplication.cpp:550
#43 0xb7179495 in QApplication::sendSpontaneousEvent (receiver=0x828d928, 
    event=0xbfc2c614) at kernel/qapplication.h:523
#44 0xb717812f in QETWidget::translateMouseEvent (this=0x828d928, 
    event=0xbfc2ca48) at kernel/qapplication_x11.cpp:4301
#45 0xb71766b0 in QApplication::x11ProcessEvent (this=0xbfc2cc9c, 
    event=0xbfc2ca48) at kernel/qapplication_x11.cpp:3478
#46 0xb718cd02 in QEventLoop::processEvents (this=0x80c4d90, flags=4)
    at kernel/qeventloop_x11.cpp:192
#47 0xb7200179 in QEventLoop::enterLoop (this=0x80c4d90)
    at kernel/qeventloop.cpp:198
#48 0xb71fff9a in QEventLoop::exec (this=0x80c4d90)
    at kernel/qeventloop.cpp:145
#49 0xb71e77bf in QApplication::exec (this=0xbfc2cc9c)
    at kernel/qapplication.cpp:2758
#50 0xb6611495 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#51 0xb7f43524 in kdeinitmain () from /usr/lib/kde3/konqueror.so
#52 0x0804e457 in launch (argc=2, _name=0x807adb4 "konqueror", 
    args=0x807ae31 "", cwd=0x807ae32 "/home/ronny", envc=30, 
    envs=0x807b28c "", reset_env=true, tty=0x0, avoid_loops=false, 
    startup_id_str=0x807b291 "dhcppc0;1174765925;663282;21181_TIME2239853822")
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:673
#53 0x0804ecf9 in handle_launcher_request (sock=5)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:1240
#54 0x0804f20c in handle_requests (waitForPid=0)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:1433
#55 0x080502b1 in main (argc=5, argv=0xbfc2d754, envp=0xbfc2d76c)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:1909
#56 0xb7cafea8 in __libc_start_main () from /lib/tls/libc.so.6
#57 0x0804b911 in _start () at ../sysdeps/i386/elf/start.S:119