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From: Sergei Kornilov <sk@zsrv.org>
To: Thomas Munro <thomas.munro@enterprisedb.com>
Cc: Maksim Milyutin <milyutinma@gmail.com>
Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>
Subject: Re: BUG #15585: infinite DynamicSharedMemoryControlLock waiting in parallel query
Date: Fri, 12 Apr 2019 16:48:19 +0300
Message-ID: <31541555076899@sas1-b3ec53dbc12b.qloud-c.yandex.net> (raw)
In-Reply-To: <4543511548366364@myt6-fe24916a5562.qloud-c.yandex.net>
References: <15585-324ff6a93a18da46@postgresql.org>
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	<4543511548366364@myt6-fe24916a5562.qloud-c.yandex.net>

Hello

Just for archive purposes:

This bug should be already fixed in stable branch and will be shipped in next minor release (11.3 and 10.8). Until the fix is released, the simplest workaround is to disable parallel query with SET max_parallel_workers_per_gather = 0 if you're affected by the bug.
It's a rare timing bug, but some workloads seem to be more prone to it, so unfortunately it went undetected for a long time.

Related discussion and patch was here: https://www.postgresql.org/message-id/flat/20190207014719.GJ29720%40telsasoft.com

regards, Sergei





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