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slapd crashes (ldap 2.1.30, db 4.1.25)

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Hello.  We just moved our production LDAP server to OpenLDAP, after lots
of good results running in limited tests.

*Something* is crashing slapd.  I don't know what.  Nothing's logged,
and core isn't dumped.  I will submit an ITS if I can figure out what's
going on.

Our setup:
~  Red Hat Workstation 3.0 w/ 2 CPUS ( + SMP ) and 2 Gb RAM

~  o=WFU,c=US
~    is an LDAP backend
~    "suffixmassage" translating to "ou=Users,dc=wfu,dc=edu"
~  dc=wfu,dc=edu
~    is a BDB backend.
~    No DB_CONFIG, "cachesize" set to 5000 in slapd.conf

Our secondary server is the one everyone's hitting.  It seems like a lot
of connections aren't being closed by the clients; maybe that has
something to do with it.

I've turned logging up A LOT but there's no consistent error.  Some of
the things that show up in the log include

connection_close: deferring
ber_get_next on fd 172 failed errno=11 (Resource temporarily unavailable)

My questions for you:
~  * does anyone know why slapd is crashing?
~  * is there anything I *need* in DB_CONFIG or slapd.conf, e.g. an idle
~  * are there any configuration parameters that, when improperly
configured, can cause slapd to crash?
~  * are there any file permissions, etc. on the UNIX side that could
cause slapd to crash?

Thanks very much!
- --
~           John Borwick
~       Systems Administrator
~      Wake Forest University | web  http://www.wfu.edu/~borwicjh
~      Winston-Salem, NC, USA | GPG key ID               56D60872
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