Re: (ITS#5161) delta-syncrepl mutex lockup

[quanah@zimbra.com]

--On October 2, 2007 8:26:10 PM +0000 hyc@symas.com wrote:

> Based on the (unreliable) pstack output it appears that all of the
> threads are  waiting for the same mutex. This of course shouldn't be
> possible since one of  those threads must already own it. We really need
> to have gdb access here to  inspect the state of the mutex and see which
> thread is the owner, then figure  out why it's trying to lock it again.
> In OpenLDAP 2.3 this pretty much means  that some operation locked the
> mutex and somehow completed without unlocking  it, i.e. completed without
> going thru the accesslog response callback.
>
> This has nothing to do with BDB so db_stat isn't relevant here. It's
> about the  accesslog overlay and any other overlays that may be
> manipulating the callback  stack, so your slapd.conf is more relevant
> here.

I mainly wanted the db_stat information to make sure there were no held 
writelocks, which it is clear is not the case.

I find I do have another pstack output from this same type of hang with 
another client at:

<http://bugzilla.zimbra.com/attachment.cgi?id=5896>

I'm working on getting the slapd.conf in question, but I believe the only 
overlays affecting the BDB backend are syncprov and accesslog.

--Quanah


--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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