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List:       pgsql-bugs
Subject:    Re: Segmentation fault when calling BlessTupleDesc in a C function in parallel on PostgreSQL-(12.6, 
From:       Thomas Munro <thomas.munro () gmail ! com>
Date:       2021-05-29 3:51:51
Message-ID: CA+hUKG+Jadj0GaqaaZeqjpx-kiPiDKVsBLEnf06E=Ns8HKyLvg () mail ! gmail ! com
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On Mon, May 17, 2021 at 7:01 PM Eric Thinnes <e.thinnes@gmx.de> wrote:
>  > PG 11, before that there was a different arrangement involving
>  > translation), but there is a low probability edge case that your test
>  > manages to hit fairly reliably, where two backends try to bless a
>
> I see that I have a talent for stepping into the trap.
>
>  > record_table_entry->key.u.shared_tupdesc);
>  >                  Assert(result->tdrefcount == -1);
>  >
>  > With that change I can see it still hits this path often but works
>  > correctly.  Will fix next week.
>
> That is good news.
>
> This means that all users can benefit from it.

Pushed.  Thanks for the report and the reproducer!


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