Version:           3.5.5 (using KDE 3.5.5, Debian Package 4:3.5.5a.dfsg.1-8 (4.0))
Compiler:          Target: i486-linux-gnu
OS:                Linux (i686) release 2.6.18-4-686

When I closed the konqueror window, KDE crashed with the following backtrace. Using Debian Etch (stable).

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 1097582624 (LWP 8222)]
[KCrash handler]
#9  0x41682024 in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
#10 0x40260006 in pthread_mutex_lock () from /lib/tls/i686/cmov/libc.so.6
#11 0x41031f8f in XInitThreads () from /usr/lib/libX11.so.6
#12 0x4104cf7f in XrmDestroyDatabase () from /usr/lib/libX11.so.6
#13 0x410338a6 in _XFreeDisplayStructure () from /usr/lib/libX11.so.6
#14 0x4101f784 in XCloseDisplay () from /usr/lib/libX11.so.6
#15 0x40a5549f in qt_cleanup () at kernel/qapplication_x11.cpp:2456
#16 0x40acedaa in ~QApplication (this=0xbfe41c2c)
    at kernel/qapplication.cpp:1084
#17 0x4075e169 in ~KApplication (this=0xbfe41c2c)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kdecore/kapplication.cpp:1644
#18 0x41940515 in kdemain (argc=2, argv=0x807c608)
    at /tmp/buildd/kdebase-3.5.5a.dfsg.1/./konqueror/konq_main.h:10
#19 0x4001a524 in kdeinitmain (argc=2, argv=0x807c608) at konqueror_dummy.cc:3
#20 0x0804e457 in launch (argc=2, _name=0x807ccbc "konqueror", 
    args=0x807ccce "", cwd=0x0, envc=1, envs=0x807ccdf "", reset_env=false, 
    tty=0x0, avoid_loops=false, 
    startup_id_str=0x807cce4 "kusumanchi;1176241525;593106;3318_TIME3715453717") at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:673
#21 0x0804ecf9 in handle_launcher_request (sock=9)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:1240
#22 0x0804f092 in handle_requests (waitForPid=0)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:1443
#23 0x080502b1 in main (argc=5, argv=0xbfe426e4, envp=0xbfe426fc)
    at /tmp/buildd/kdelibs-3.5.5a.dfsg.1/./kinit/kinit.cpp:1909
#24 0x4019cea8 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#25 0x0804b911 in _start () at ../sysdeps/i386/elf/start.S:119