Received: from malur.postgresql.org ([217.196.149.56])
	by arkaria.postgresql.org with esmtps
 (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <pgsql-bugs-owner+archive@lists.postgresql.org>)
	id 1kcEoA-0001Fo-G0
	for pgsql-bugs@arkaria.postgresql.org; Mon, 09 Nov 2020 21:34:38 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.92)
	(envelope-from <pgsql-bugs-owner+archive@lists.postgresql.org>)
	id 1kcEo9-00041C-DC
	for pgsql-bugs@arkaria.postgresql.org; Mon, 09 Nov 2020 21:34:37 +0000
Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29])
	by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1kcEo9-000415-7F
	for pgsql-bugs@lists.postgresql.org; Mon, 09 Nov 2020 21:34:37 +0000
Received: from sss.pgh.pa.us ([66.207.139.130])
	by magus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1kcEo7-00063C-0v
	for pgsql-bugs@lists.postgresql.org; Mon, 09 Nov 2020 21:34:36 +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 0A9LYX9v1999973;
	Mon, 9 Nov 2020 16:34:33 -0500
From: Tom Lane <tgl@sss.pgh.pa.us>
To: kurt@roeckx.be
cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #16707: Memory leak
In-reply-to: <16707-f5df308978a55bf8@postgresql.org>
References: <16707-f5df308978a55bf8@postgresql.org>
Comments: In-reply-to PG Bug reporting form <noreply@postgresql.org>
	message dated "Mon, 09 Nov 2020 21:07:21 +0000"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <1999971.1604957673.1@sss.pgh.pa.us>
Date: Mon, 09 Nov 2020 16:34:33 -0500
Message-ID: <1999972.1604957673@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>
Precedence: bulk

PG Bug reporting form <noreply@postgresql.org> writes:
> It seems that since I switched from PostgreSQL 9.5 to 12, I started to have
> a memory leak.

Could you maybe collect a memory map from one of the bloated processes?
It'd go something like

* attach to process with gdb

* "call MemoryContextStats(TopMemoryContext)"

* quit gdb

* look in postmaster log for memory dump

You probably need to have debug symbols installed for step 2 to work.

			regards, tom lane