qmail-remote uses 100% CPU when delivering to certain hosts

[Boris Kochergin]

Hi.

Firstly, my environment:

FreeBSD isis.poly.edu 9.1-RC1 FreeBSD 9.1-RC1 #0: Thu Sep 20 23:42:23 
EDT 2012     boris at jails.isis.poly.edu:/usr/obj/usr/src/sys/GENERIC  amd64

qmail-tls-1.03.20021228_4

I have noticed that qmail-remote spins around using 100% CPU forever 
when delivering mail to a select few hosts. I believe this all to be in 
userspace as top reports that the CPU is busy with only userspace code. 
This has never happened when the machine was running 8.0-RELEASE, but 
happens with 8.2-RELEASE and 9.1-RC1.

The environment this happens in is a jail.

Calling truss on the offending processes produces no output, with truss 
in the "wait" state forever. I've tcpdumped the conversation between the 
qmail-remote process and the remote host. It is attached with this e-mail.

Thoughts?

-Boris
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