Received: from malur.postgresql.org ([217.196.149.56])
	by arkaria.postgresql.org with esmtps  (TLS1.3) tls
 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
	(Exim 4.94.2)
	(envelope-from <pgsql-bugs-owner+archive@lists.postgresql.org>)
	id 1qtxmx-00FFdg-BI
	for pgsql-bugs@arkaria.postgresql.org; Fri, 20 Oct 2023 22:16:15 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.94.2)
	(envelope-from <pgsql-bugs-owner+archive@lists.postgresql.org>)
	id 1qtxmv-008Zc2-B8
	for pgsql-bugs@arkaria.postgresql.org; Fri, 20 Oct 2023 22:16:14 +0000
Received: from makus.postgresql.org ([2001:4800:3e1:1::229])
	by malur.postgresql.org with esmtps  (TLS1.3) tls
 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
	(Exim 4.94.2)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1qtxmv-008Zb2-2s
	for pgsql-bugs@lists.postgresql.org; Fri, 20 Oct 2023 22:16:13 +0000
Received: from sss.pgh.pa.us ([68.162.161.243])
	by makus.postgresql.org with esmtps  (TLS1.3) tls
 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
	(Exim 4.94.2)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1qtxmp-001Upg-5H
	for pgsql-bugs@lists.postgresql.org; Fri, 20 Oct 2023 22:16:12 +0000
Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1])
	by sss.pgh.pa.us (8.15.2/8.15.2) with ESMTP id 39KMG4v03998078;
	Fri, 20 Oct 2023 18:16:04 -0400
From: Tom Lane <tgl@sss.pgh.pa.us>
To: maxime.boyer@cra-arc.gc.ca
cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #18165: Could not duplicate handle for
 "Global/PostgreSQL.xxxxxxxxxx": Bad file descriptor
In-reply-to: <18165-bf4f525cea6e51de@postgresql.org>
References: <18165-bf4f525cea6e51de@postgresql.org>
Comments: In-reply-to PG Bug reporting form <noreply@postgresql.org>
	message dated "Fri, 20 Oct 2023 20:18:08 -0000"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <3998076.1697840164.1@sss.pgh.pa.us>
Date: Fri, 20 Oct 2023 18:16:04 -0400
Message-ID: <3998077.1697840164@sss.pgh.pa.us>
List-Id: <pgsql-bugs.lists.postgresql.org>
List-Help: <https://lists.postgresql.org/manage/>
List-Subscribe: <https://lists.postgresql.org/manage/>
List-Post: <mailto:pgsql-bugs@lists.postgresql.org>
List-Owner: <mailto:pgsql-bugs-owner@lists.postgresql.org>
List-Archive: <https://www.postgresql.org/list/pgsql-bugs>
Archived-At: 
 <https://www.postgresql.org/message-id/3998077.1697840164%40sss.pgh.pa.us>
Precedence: bulk

PG Bug reporting form <noreply@postgresql.org> writes:
> Could not duplicate handle for "Global/PostgreSQL.xxxxxxxxxx": Bad file
> descriptor

That must be coming from dsm_impl_pin_segment or dsm_impl_unpin_segment;
noplace else has the same error message spelling.

> Error started after a pg_upgrade from 11.17 to 14.9 on the same physical
> servers.

Both those messages predate v11, so it's hard to tell what changed.
Are you sure the OS environment didn't change too?

			regards, tom lane