Re: Parallel scan with SubTransGetTopmostTransaction assert coredump

Greg Nancarrow <gregn4422@gmail.com>

From: Greg Nancarrow <gregn4422@gmail.com>

To: Pavel Borisov <pashkin.elfe@gmail.com>

Cc: Robert Haas <robertmhaas@gmail.com>, Tomas Vondra <tomas.vondra@enterprisedb.com>, Maxim Orlov <m.orlov@postgrespro.ru>, Michael Paquier <michael@paquier.xyz>, Pengchengliu <pengchengliu@tju.edu.cn>, Andres Freund <andres@anarazel.de>, PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2021-08-04T10:17:56Z

Lists: pgsql-hackers

On Wed, Aug 4, 2021 at 7:55 PM Pavel Borisov <pashkin.elfe@gmail.com> wrote:
>
>>
> Greg, thanks for the fast response! I suppose that a check for IsolationUsesXactSnapshot() is also useful in a GetTransactionSnapshot for the correct processing of a case with NULL transaction snapshot.
> This corrects mentioned check-world test.
> PFA v7 patch.

Ah, thanks for that (I didn't debug that failure).
But is the coredump issue reproducible now? (using v7 and your test script)


Regards,
Greg Nancarrow
Fujitsu Australia

Commits

Fix broken snapshot handling in parallel workers.
- 96f6ef9fe451 10.19 landed
- 198cf81e2c64 11.14 landed
- f4b77e82ebf4 12.9 landed
- bc062cb93823 13.5 landed
- 11c1239881b3 14.0 landed
- a780b2fcce6c 15.0 landed
Doc: move some catalogs.sgml entries to the right place.
- 713a431c781f 14.0 cited
Stamp 13.2.
- 3fb4c75e857a 13.2 cited
Create an infrastructure for parallel computation in PostgreSQL.
- 924bcf4f16d5 9.5.0 cited