bopm memory leak?

Hey all,

I'm seeing what looks like a memory leak on my bopm. It's not an
overused bopm, but the memory image tends to grow without bound. I've
seen the process grow to exceed >200MB. I kill the process once day or
so to clean it up.

  PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
65225 esper       1  96    0 19488K 17944K select   0:21  0.00% bopm

The host is FreeBSD 7.0-RC1, though many of our other bopms are
reporting high memory usage.

We're using version 3.1.3, and at the time of this writing, the bopm
had been up for just over 5 hours.

21:16 < eri> yeti stat
21:16 <+Yeti> Uptime: 5 hours, 13 minutes, 43 seconds
21:16 <+Yeti> DNSBL: 4 successful lookups from dnsbl.sorbs.net
21:16 <+Yeti> DNSBL: 3 successful lookups from rbl.efnet.org
21:16 <+Yeti> DNSBL: 3 successful lookups from dnsbl.ahbl.org
21:16 <+Yeti> Number of connects: 731 (2.33/minute)

Our config has a few DNS blacklists: rbl.efnet.org, SORBS, AHBL, and
one for Tor. The dns_fdlimit = 64. Our scanner scans for some 150
ports or so (it's grown rather organically, it might be time to scale
those back a bit ;-)). fd = 64, max_read = 4096, timeout = 30 for the
default scanners.

Yeti doesn't report much in fdstat:
21:20 <+Yeti> Total open FD: 2/7207

Does anyone have an ideas? We've poked around the source a bit without
much luck. We'd appreciate any insight :-)

Greets,
-eri