kernel locking on a SunOS

Recently I have started to see these mesages in my procmail log:

procmail: Timeout, was waiting for "backups-personal"
procmail: Kernel-lock failed
procmail: Kernel-unlock failed


under SunOS 4.1.4

procmail v3.11pre7 1997/04/28 written and created by Stephen R. van den Berg  
 <srb(_at_)cuci(_dot_)nl>

....

Locking strategies:     dotlocking, fcntl(), lockf(), flock()
Default rcfile:         $HOME/.procmailrc
Your system mailbox:    /var/spool/mail/luomat


This causes my procmail process to sit there and suck CPU, causing my  
sysadmin undue stress & strain....

Help?

TjL
--
TjL <luomat(_at_)peak(_dot_)org>   / http://www.peak.org/~luomat/next/
"The best things in life are made into inferior
 versions and bundled with the latest Microsoft systems"
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