Version:            (using KDE 4.2.1)
Compiler:          gcc version 4.3.3 (Gentoo 4.3.3-r1 p1.1, pie-10.1.5) march=core2 -O2
OS:                Linux
Installed from:    Gentoo Packages

I had konqueror open with two webpages opened in tabs. I clicked the close button and when it prompted me about whether I wanted to really close both tabs, I answered yes. Kcrash then informed me that konqueror had crashed. Since I build with +debug and with debug information not stripped, I am able to post this crash report:

Application: Konqueror (konqueror), signal SIGABRT
0x00007f1b880dc901 in nanosleep () from /lib/libc.so.6
Current language:  auto; currently c

Thread 1 (Thread 0x7f1b8d5e1750 (LWP 9449)):
[KCrash Handler]
#5  0x00007f1b8806f1e5 in raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#6  0x00007f1b88070703 in abort () at abort.c:88
#7  0x00007f1b88068229 in __assert_fail (assertion=0x7f1b78d81386 "!s_refcnt", file=0x7f1b78d81188 "/var/tmp/portage/kde-base/kdelibs-4.2.1-r2/work/kdelibs-4.2.1/khtml/khtml_global.cpp", line=258, 
    function=0x7f1b78d813e0 "static void KHTMLGlobal::finalCheck()") at assert.c:78
#8  0x00007f1b789ba95c in KHTMLGlobal::finalCheck () at /var/tmp/portage/kde-base/kdelibs-4.2.1-r2/work/kdelibs-4.2.1/khtml/khtml_global.cpp:258
#9  0x00007f1b791e28e2 in ~KHTMLFactory (this=0xe4c360) at /var/tmp/portage/kde-base/kdelibs-4.2.1-r2/work/kdelibs-4.2.1/khtml/khtml_factory.cpp:35
#10 0x00007f1b8b2ad2f7 in destroy () at /usr/include/qt4/QtCore/qalgorithms.h:350
#11 0x00007f1b88071d8d in exit (status=0) at exit.c:75
#12 0x00007f1b8805b5cd in __libc_start_main (main=0x4009b0 <main>, argc=2, ubp_av=0x7fff956223d8, init=0x4009e0 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff956223c8) at libc-start.c:258
#13 0x00000000004008e9 in _start ()