Re: BF mamba failure

From: Michael Paquier <michael(at)paquier(dot)xyz>
To: Kouber Saparev <kouber(at)gmail(dot)com>
Cc: Bertrand Drouvot <bertranddrouvot(dot)pg(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: BF mamba failure
Date: 2026-07-07 23:59:35
Message-ID: ak2S5046X1aaagr4@paquier.xyz
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On Tue, Jul 07, 2026 at 01:13:59PM +0300, Kouber Saparev wrote:
> We had this issue again, the database just stopped - PostgreSQL 17.6.
>
> FATAL,XX000,"trying to drop stats entry already dropped: kind=relation
> dboid=16420 objoid=3885511363 refcount=1 generation=0"
>
> There is no such object present in the database.
>
> Do you think the issue might be fixed in PostgreSQL 18.4?... Or PostgreSQL
> 19 eventually?

Well, honestly, hard to say. That's a case where a reproducible
scenario would be useful, as it seems to ve very workload dependent in
terms of handling of the relation entries.. (Aka I have not dug in
details how to do that.)

As one example, the buildfarm seems to be quite silent, but it would
help if we need something like a wraparound for better
reproducibility.
--
Michael

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