Horton

Re: pg11.1: dsa_area could not attach to segment

Justin Pryzby <pryzby@telsasoft.com>

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From: Justin Pryzby <pryzby@telsasoft.com>
To: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: Sergei Kornilov <sk@zsrv.org>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Date: 2019-02-12T05:00:58Z
Lists: pgsql-hackers 
On Mon, Feb 11, 2019 at 08:43:14PM -0600, Justin Pryzby wrote:
> I have a suspicion that this doesn't happen if
> parallel_leader_participation=off.

I think this is tentatively confirmed..I ran 20 loops for over 90 minutes with
no crash when parallel_leader_participation=off.

On enabling parallel_leader_participation, crash within 10min.

Sergei, could you confirm ?

Thomas:

2019-02-11 23:56:20.611 EST [12699] PANIC:  dsa_area could not attach to segment index:6 handle:1376636277
[pryzbyj@telsasoft-db postgresql]$ ls /dev/shm/ |grep PostgreSQL.1376636277 || echo Not present.
Not present.

Thanks,
Justin

Commits

  1. Fix race in dsm_attach() when handles are reused.

  2. Refactor pid, random seed and start time initialization.