Re: (ITS#7378) Slapd hangs on bdb write lock

[hyc@symas.com]

michael@stroeder.com wrote:
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> A couple of days ago I had a hang with OpenLDAP 2.4.32 / back-hdb running=
>  on
> Debian Squeeze, self-compiled against BDB 4.8.30. It seemed Database was
> locked as restarting slapd of even rebooting OS did not help. Unfortunate=
> ly I
> had to bring up the system as fast as possible and could not examine the =
> problem.

db_recover will always return the DB to a usable state and reset any DB locks.
(It completely deletes the lock region, so there cannot be any stale locks
after it runs.)

> The system has only 200 entries and not much load yet. I had renamed entr=
> ies
> with web2ldap when all 4 masters (4-way MMR) locked up one after the othe=
> r.

> So there seem to be lockup problems in 2.4.32.

The only way to know if you're seeing the same problem as the original poster
is if you provide db_stat -CA and gdb trace output, like the original poster did.

-- 
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/