Frequent DBERROR DB4

Stephen Conway sconway at
Wed Nov 9 15:42:44 EST 2005

Hello Igor:

The locker number does indeed continue to grow, in the 500s one time even
into the 1000s.  My next problem is this, I have it installed 2.1.12 from
the tar source, what steps should I take to install the new version?  Should
I download the source, or is it possible for me to use the rpm on RH8?  I
saw the readme from the rpms and it said not to install it if you have
previously tried to install from source.  What should I backup prior to
trying to install either the source or the rpm?



-----Original Message-----
From: Igor Brezac [mailto:igor at] 
Sent: Wednesday, November 09, 2005 3:25 PM
To: Stephen Conway
Cc: info-cyrus at
Subject: RE: Frequent DBERROR DB4

On Wed, 9 Nov 2005, Stephen Conway wrote:

> Hello:
> But, can these cause the server to eventually stop responding?  POP and

Not unless the locker number continues to grow.

> connections are no longer possible, and after a restart it comes back.  So
> the next question is, should I consider an upgrade, and if so, what steps
> should I consider?  What should I backup prior to installing?  Am I able
> use the rpm?

Upgrade cyrus will fix your problem.


> Thanks,
> Steve
> -----Original Message-----
> From: Marcelo H. Terres [mailto:mhterres at]
> Sent: Wednesday, November 09, 2005 2:25 PM
> To: Stephen Conway
> Subject: Re: Frequent DBERROR DB4
> Q: I'm getting messages in imapd.log like:
> Sep 11 17:23:55 ogg lmtpd[773]: DBERROR db3: 16 lockers
> Sep 11 17:23:55 ogg lmtpd[1409]: DBERROR db3: 17 lockers
> Sep 11 17:23:56 ogg lmtpd[1508]: DBERROR db3: 9 lockers
> Sep 11 17:23:56 ogg lmtpd[776]: DBERROR db3: 9 lockers
> What's wrong?
>   A: Nothing is wrong. These messages are logged whenever Berkeley
> db encounters lock contention, but isn't necessarily a problem by
> themselves. This is especially likely when you have an empty or small
> duplicate delivery database and are receiving a large volume of
> e-mail.
>   Berkeley db 4.0 has a bug where the number of lockers isn't
> decremented properly, causing this number to be unreliable.
> []
> 2005/11/9, Stephen Conway <sconway at>:
>> Hello:
>> We have a Cyrus IMAPD server version 2.1.12 running on a RH 8 server.
>> is working find up until last week, now we are getting increasing errors
> as
>> follows:
>> Nov  7 22:36:33 antar lmtpd[1057]: DBERROR db4: 50 lockers
>> The number before lockers keeps going higher and higher until eventually
> the
>> server stops receiving pop and imap connections.  After a restart of the
>> server, it starts over again.  My question is, how can I stop these, and
> why
>> after a reboot does it reset down to 1 again?  I have read a bit in the
>> archives and it seems that this has something to do with Berkley DB and
> that
>> updating to newest version of Cyrus should fix this, is this correct?  If
>> so, what are the necessary steps to install the latest version,
>> the existing system, users, messages, etc.
>> In addition, previous version was not installed with the RPM, can you let
> me
>> know where to find the RPM for RH8?
>> Any light you can shed is appreciated.
>> Regards,
>> Steve
>> --
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>> ----
>> Cyrus Home Page:
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> --
> Marcelo H. Terres
> mhterres at


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