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(ITS#4216) slapd terminates unexpectedly

Full_Name: James MacNider
Version: 2.1.6 and 2.2.29
OS: Solaris 8
Submission from: (NULL) (

I think this may be the same issue as was previously reported in ITS# 3567 which
was previously closed.

I have been seen the slapd server exit (gracefully, no core) under high load
when using the NULL backend that is included as part of the OpenLDAP
distribution.  I've been able to reproduce this almost at will with versions
2.1.6 and 2.2.29 of the OpenLDAP slapd process.  I'm using SLAMD (www.slamd.org)
to generate the load. 

Tracing through the code it again seems to be that the problem is getting an
ENOSYS code back from the call to select(), as in ITS# 3567.  Because I'm using
the null backend I can't see how this defect could be in the backend code as
suggested in ITS# 3567.  It is of course possible that this is a defect in
Solaris and not OpenLDAP, but that has yet to be proven one way or the other.