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Re: ldap deadlock?

To: Curt Blank <curt@uwm.edu>
Subject: Re: ldap deadlock?
From: Howard Chu <hyc@symas.com>
Date: Tue, 08 Aug 2006 16:35:30 -0700
Cc: openldap-software@OpenLDAP.org
In-reply-to: <44D9064A.1000105@uwm.edu>
References: <44D9064A.1000105@uwm.edu>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20060716 SeaMonkey/1.5a

Curt Blank wrote:

I'm looking for ideas here. ldap seems to deadlock once in a while whereby it continues to accept connections as noted in the log file but it does not return anything to the query, the query just hangs.

It's openldap 2.2.28 using Berkley db 4.2.52 as the backend on a SuSE 9.3 platform. All patches are up to snuff on the OS side.
I'm hoping for pointers to help see what might be going on.
As of today I started running db_deadlock in the background wit the -a y option to see if that helps.

This deadlocking is getting people up in arms here because it is disrupting authentication for the whole campus and I guess I can't blame them.

There have been no deadlocks reported in OpenLDAP 2.2 after 2.2.20. More likely you had an unclean shutdown and restarted without running db_recover, so you have stale locks in the environment. You should upgrade to 2.3 which does recovery automatically.

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

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  - From: Curt Blank <curt@uwm.edu>

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