sshd crashes

I am using the following version of openssh -
"openssh-server-4.3p2-16.el5" in the CentOS 5 environment. Whenever
non-local user logs into the box [ not a system created user ] and
logs out sshd segfaults with the following message in
/var/log/messages.

sshd[9250]: segfault at 00000000d7bcbc6c rip 00002aaaace1a664 rsp
00007fff5b1c0918 error 4

This happens only with 64bit Intel/AMD machines and however it works
fine on 32bit machines. Any pointers where I can look for?

thanks,
bhagya prasad