Feedback-ID: i0fe9450f:Fastmail
Date: Wed, 8 Apr 2026 11:06:14 +0900
From: Michael Paquier <michael@paquier.xyz>
To: Chris Hofstaedtler <ch+pg@zeha.at>
Cc: Thomas Munro <thomas.munro@gmail.com>, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #19416: Backend SIGSEGV in
 ExecShutdownHashJoin/ExecHashTableDetach/dsa_free
Message-ID: <adW4FhgrcxmBQ_yI@paquier.xyz>
References: <19416-967b71bb54d8fe9b@postgresql.org>
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On Tue, Apr 07, 2026 at 10:53:36AM +0200, Chris Hofstaedtler wrote:
> Sorry for the lack of followup. Currently we are thinking our problem
> matches the bug described in
> https://postgr.es/m/044401dcabac$fe432490$fac96db0$@icloud.com
> ("[BUG + PATCH] DSA pagemap out-of-bounds in make_new_segment odd-sized
> path").

That smells like the same problem to me.

> For now our plan is to wait for the next 18.x stable release, and then reenable
> enable_parallel_hash. Then see if it occours again.

The next minor release is planned for the 14th of May, as per:
https://www.postgresql.org/developer/roadmap/

Please let us know how it goes, in case we have a different problem at
hand.  You could as well cherry-pick 4da2afd01f93 in your builds of
v18, and give it a try in a non-production environment.
--
Michael

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