[exim] Numerous segfaults with 64 bit exim

I get numerous segfaults on 2 exim servers that also scan mail using
ClamAV and Spamassassin. I don't get segfaults on exim servers that just
accept mail and don't scan it.

Anybody else seeing this?

CentOS 5.6


exim[21485]: segfault at 0000000000000000 rip 00000038b6a79470 rsp
00007fff489d94b8 error 4



gdb output:

Core was generated by `/usr/local/exim/bin/exim -bd -q10m'.
Program terminated with signal 11, Segmentation fault.
#0 0x00000038b6a79470 in strchr () from /lib64/libc.so.6
begin:vcard
fn:Patrick Boutilier
n:Boutilier;Patrick
org:;Nova Scotia Department of Education
adr:;;2021 Brunswick Street;Halifax;NS;B3K 2Y5;Canada
email;internet:boutilpj@???
title:WAN Communications Specialist
tel;work:902-424-6800
tel;fax:902-424-0874
version:2.1
end:vcard