multiply segfaults in rxvt

[igor <igor@mexmat.net>]

Hi,

I'm using debian64 unstable (alioth) on my Athlon64 2800+ for 2 monthes. All 
works well.
But
$ dmesg | grep segfault
rxvt[1614]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff870 error 4
rxvt[1985]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff200 error 4
rxvt[2884]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff200 error 4
rxvt[28655]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff040 error 4
rxvt[29580]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff220 error 4
rxvt[15245]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff040 error 4
rxvt[16795]: segfault at 0000000000000000 rip 000000000040caca rsp 
0000007fbffff870 error 4
$

What does it mean? What should I do to prevent this segfaults?

Thanks,
Igor.