Milter-greylist

I have just installed milter-greylist-3.0 and 3.1.1 on my amd64 box
(gentoo).  I have a couple of problems.

1. It seems to segfault unpredictably - usually after 8-10 hours of normal
operation:

Nov 26 05:21:38 mypc milter-greylist[22394]: segfault at 0000000000584000
rip 00002b968f4e1d7b rsp 0000000042002128 error 6
Nov 26 05:21:38 mypc sm-mta[22393]: kAPILWJ0022393: milter_read(greylist):
cmd read returned 0, expecting 5
Nov 26 05:21:38 mypc sm-mta[22393]: kAPILWJ0022393: Milter (greylist): to
error state

2. It crashes when run with the -D option (when a message arrives):

SPF return code 5
SPF lookup performed in 0.017231s
kAPNXg2Q015893: addr = webmail01.dodo.com.au[202.136.34.19], from =
<user@...>, rcpt = <myaddress@...>
Segmentation fault

I don't know if these two problems are related.  The first one would
obviously be difficult to debug.  What is "error 6".

I've used '--enable-dnsrbl --with-libspf2=/usr/lib' as my options and
libspf-1.2.5