[Mimedefang] Strange slave timeout errors

[Graham Dunn]

I seen a few (maybe 5 in 1000) mails that will cause the slave to sit
and just chew through CPU until it reaches the max time and the
multiplexor kills it:

Jul  4 13:21:23 ureshii mimedefang-multiplexor: Killing busy slave 3
(pid 14339) : Busy timeout 
Jul  4 13:21:23 ureshii mimedefang[417]: Error from multiplexor: ERR
Filter timed out - check filter rules or system load
Jul  4 13:21:23 ureshii mimedefang-multiplexor: Slave 3 resource
usage: req=1, s cans=1, user=288.870, sys=0.404, nswap=0, majflt=0,
minflt=8624, maxrss=22748, bi=0, bo=0

There's usually 300M of memory free on this system (dual P3-800).
FreeBSD 4.6.2-RELEASE, mimedefang-2.34 from ports.

MIMEDefang version 2.34

HTML::Parser                  : yes
HTML::TokeParser              : yes
HTMLCleaner                   : yes
Path:CONFDIR                  : yes (/usr/local/etc/mimedefang)
Path:QUARANTINEDIR            : yes (/var/spool/MD-Quarantine)
Path:SENDMAIL                 : yes (/usr/sbin/sendmail)
Path:SPOOLDIR                 : yes (/var/spool/MIMEDefang)
SpamAssassin                  : yes
Virus:NAI                     : yes (/usr/local/bin/uvscan)
File::Scan                    : no
Unix::Syslog                  : no
Virus:AVP                     : no
Virus:CLAMAV                  : no
Virus:CLAMD                   : no
Virus:FPROT                   : no
Virus:FPROTD                  : no
Virus:FSAV                    : no
Virus:FileScan                : no
Virus:HBEDV                   : no
Virus:NVCC                    : no
Virus:OpenAV                  : no
Virus:SOPHIE                  : no
Virus:SOPHOS                  : no
Virus:SymantecCSS             : no
Virus:TREND                   : no
Virus:TROPHIE                 : no
Virus:VEXIRA                  : no

IO::Socket                    : Version 1.1603
MIME::Tools                   : Version 5.411 
MIME::Words                   : Version 5.404 
Digest::SHA1                  : Version 2.02
Mail::SpamAssassin            : Version 2.55
Anomy::HTMLCleaner            : Version 1.23
File::Scan                    : missing
HTML::Parser                  : Version 3.28
HTML::TokeParser              : Version 2.24
Unix::Syslog                  : missing

I've attached two messages that caused this. Both of them are fairly
heavy on HTML, is Spamassassin the usual suspect?

Any ideas?

Graham
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