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slapd goes <DEFUNCT> after random time (ITS#248)

Full_Name: Michael Dwyer
Version: 1.2.1 (libldap)
OS: Linux 2.0.36/Slackware
Submission from: (NULL) (

After a seemingly random amount of time, the SLAPD server stops answering, and
up in the process list as [<DEFUNCT>].  You can only -KILL it, as far as I can

My current working theory is that my problems are somehow connected to SYN
I usually see a LOT of suspected syn cookie attacks on the LDAP port.  This is
my internal network, where nobody would be attacking me. They are most likely
reactions to the large number of connections that Netscape places on it.

I'm going to try disabling syn cookies, and am reading up on it, but has anyone
else seen this?  For that matter, I can't even figure out what "DEFUNCT" means!