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Re: Going for "all green" buildfarm results

From: Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Andrew Dunstan <andrew(at)dunslane(dot)net>, pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: Going for "all green" buildfarm results
Date: 2006-06-02 14:47:25
Message-ID: 44804F7D.7070408@kaltenbrunner.cc (view raw or flat)
Thread:
Lists: pgsql-hackers
Tom Lane wrote:
> Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> writes:
> 
>>FWIW: lionfish had a weird make check error 3 weeks ago which I
>>(unsuccessfully) tried to reproduce multiple times after that:
> 
> 
>>http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=lionfish&dt=2006-05-12%2005:30:14
> 
> 
> Weird.
> 
>   SELECT ''::text AS eleven, unique1, unique2, stringu1 
>                 FROM onek WHERE unique1 < 50 
>                 ORDER BY unique1 DESC LIMIT 20 OFFSET 39;
> ! ERROR:  could not open relation with OID 27035
> 
> AFAICS, the only way to get that error in HEAD is if ScanPgRelation
> can't find a pg_class row with the mentioned OID.  Presumably 27035
> belongs to "onek" or one of its indexes.  The very next command also
> refers to "onek", and doesn't fail, so what we seem to have here is
> a transient lookup failure.  We've found a btree bug like that once
> before ... wonder if there's still one left?

If there is still one left it must be quite hard to trigger (using the
regression tests). Like i said before - I tried quite hard to reproduce
the issue back then - without any success.


Stefan

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