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Re: Curious buildfarm failures

From: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Curious buildfarm failures
Date: 2013-01-14 22:14:50
Message-ID: 50F4835A.6040409@vmware.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On 14.01.2013 23:35, Tom Lane wrote:
> Since commit 2065dd2834e832eb820f1fbcd16746d6af1f6037, there have been
> a few buildfarm failures along the lines of
>
>    -- Commit table drop
>    COMMIT PREPARED 'regress-two';
> ! PANIC:  failed to re-find shared proclock object
> ! PANIC:  failed to re-find shared proclock object
> ! connection to server was lost
>
> Evidently I bollixed something, but what?  I've been unable to reproduce
> this locally so far.  Anybody see what's wrong?

I was able to reproduce this by setting max_locks_per_transaction and 
max_connections to the minimum. My assumption is that there's something 
wrong in the way hash_update_hash_key() handles collisions.

- Heikki


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