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Date: Mon, 3 Apr 2006 15:59:11 +1200
From: Andrew Thompson <thompsa@freebsd.org>
To: "Marc G. Fournier" <scrappy@postgresql.org>
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Cc: Tom Lane <tgl@sss.pgh.pa.us>, pgsql-hackers@postgresql.org,
	freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject: Re: [HACKERS] semaphore usage "port based"?
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On Sun, Apr 02, 2006 at 11:41:01PM -0400, Kris Kennaway wrote:
> On Mon, Apr 03, 2006 at 12:30:58AM -0300, Marc G. Fournier wrote:
> > 'k, but how do I fix kill so that it has the proper behaviour if SysV is 
> > enabled?
> 
> Check the source, perhaps there's already a way.  If not, talk to
> whoever made the change.
> 
> > Maybe a mount option for procfs that allows for pre-5.x 
> > behaviour?
> 
> procfs has nothing to do with this though.
> 
> > I'm not the first one to point out that this is a problem, just 
> > the first to follow it through to the cause ;(  And I believe there is 
> > more then just PostgreSQL that is affected by shared memory (ie. apache2 
> > needs SysV IPC enabled, so anyone doing that in a jail has it enabled 
> > also) ...
> 
> Also note that SysV IPC is not the problem here, it's the change in
> the behaviour of kill() that is causing postgresql to become confused.
> That's what you should investigate.

The ESRCH error is being returned from prison_check(), that would be a
good starting place.


Andrew