squatter segfaults on large mailboxes - FreeBSD

[Per olof Ljungmark]

Cyrus-IMAP 2.3.8 with UOA autocreate patches
FreeBSD 6-STABLE

The command was:
su cyrus -c "/usr/local/cyrus/bin/squatter -r -s -v user"
The error is
Indexing mailbox user/spamdump/archive/2006/08... Segmentation fault
kernel: pid 6988 (squatter), uid 60: exited on signal 11

There is free memory available when this happens but still it could be a 
system limit somehow. Anyone else out there running FreeBSD that could 
give a hint?

Have two more boxes where this works fine on same mailbox but they do 
have a bit more RAM.

Thanks,