Re: (ITS#6310) Slapd with pcache crashes under load

[masarati@aero.polimi.it]

> Hello,
> I have somehow changed the setup:
>
> The first process is a ldap to sql server withpout pcache
> the config file is here:
> http://purgatory.spnet.net/~karavelov/abort/slapd.conf
>
> The second process is a pure cache that reads from the first process
> using unix domain socket. The config file is here:
> http://purgatory.spnet.net/~karavelov/abort/slapd-proxy.conf
>
> The sql backend runs without problems. But the proxy process crashes
> once or twice a day on assertion:
>
> The output of the process is here:
> http://purgatory.spnet.net/~karavelov/abort/log
>
> It was running in valgrind, so here is its output:
> http://purgatory.spnet.net/~karavelov/abort/vg
>
> The process has dumped a core. I have made a debugging session with it.
> Here it is:
> http://purgatory.spnet.net/~karavelov/abort/gdb
>
> I am not sure what to look for. The process aborts on the same
> asserrtion even it is not run in valgrind.

No.  Some overlay along the lines apparently mucks with e_private in the
entry that back-ldap is sending.  It's probably slapo-pcache.  I need to
debug this.  You say it happens seldom.  Can you recognize anything
special in the operation that triggers the assertion failure?  I mean:
either in terms of special data, or in terms of special state of the
cache?  This could help narrow down some means to reproduce the issue.

Thanks, p.