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Re: unexpected "ERROR: concurrent delete in progress"

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Jon Nelson <jnelson+pgsql(at)jamponi(dot)net>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: unexpected "ERROR: concurrent delete in progress"
Date: 2010-12-07 20:19:23
Message-ID: 27631.1291753163@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugs
Jon Nelson <jnelson+pgsql(at)jamponi(dot)net> writes:
> While tracking down some issues that /might/ be kernel related, I ran
> into an error message:

> ERROR:  concurrent delete in progress

> With this SQL in a file (t.sql):

> begin;
> create temporary table foo as select x as a, ARRAY[x] as b FROM
> generate_series(1, 10000000 ) AS x;
> create index foo_a_idx on foo (a);
> create index foo_b_idx on foo USING GIN (b);
> rollback;

> I had issued this bash:

> while true; do psql -f t.sql test >> out 2>&1; done

> and after a dozen or so iterations I encountered that error message.
> Now, it *might* be kernel related, but what else might it be?
> I'm on Linux x86_64, using postgresql 8.4.5.

FWIW, I can't replicate that using either HEAD or current 8.4.x,
on Fedora 13 x86_64.  It's quite unobvious though how kernel
or hardware flakiness might lead to that message.  *Maybe* you
could get it from a dropped hint-bit or some such, but I don't
see a clear explanation.

			regards, tom lane

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