Here's a backtrace with rxvt-dbgsym installed:
(gdb) bt
#0 0xb76dbcf9 in __kernel_vsyscall ()
#1 0xb7350d61 in __lll_lock_wait_private ()
at ../sysdeps/unix/sysv/linux/i386/lowlevellock.S:97
#2 0xb7347ad7 in __nptl_setxid (cmdp=0xbf8a6ee8) at allocatestack.c:1085
#3 0xb74a2336 in __GI_seteuid (uid=1000)
at ../sysdeps/unix/sysv/linux/i386/seteuid.c:31
#4 0x0048394e in rxvt_privileges (mode=114, r=0x2319008) at main.c:288
#5 rxvt_privileged_utmp (action=114 'r', r=0x2319008) at main.c:322
#6 rxvt_clean_exit () at main.c:196
#7 0xb73f079b in __run_exit_handlers (status=0,
listp=0xb75763dc <__exit_funcs>, run_list_atexit=true, run_dtors=true)
at exit.c:83
#8 0xb73f0801 in __GI_exit (status=0) at exit.c:105
#9 0x004835a5 in rxvt_Child_signal (sig=17) at main.c:141
#10 <signal handler called>
#11 0xb76dbcf9 in __kernel_vsyscall ()
#12 0xb7347d67 in __nptl_setxid (cmdp=<optimized out>) at allocatestack.c:1172
#13 0xb74a2336 in __GI_seteuid (uid=1000)
at ../sysdeps/unix/sysv/linux/i386/seteuid.c:31
#14 0x0048394e in rxvt_privileges (mode=114, r=0x2319008) at main.c:288
#15 rxvt_privileged_utmp (action=114 'r', r=0x2319008) at main.c:322
#16 rxvt_clean_exit () at main.c:196
#17 0x00482369 in rxvt_cmd_getc (r=0x2319008) at command.c:754
#18 0x004833e9 in rxvt_main_loop (r=0x2319008) at command.c:3031
#19 0x0047f64c in main (argc=1, argv=0xbf8a7934) at rxvt.c:13
--
2. That which causes joy or happiness.
