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-admin-owner+archive@lists.postgresql.org>)
	id 1kGjeh-0008Mv-D8
	for pgsql-admin@arkaria.postgresql.org; Fri, 11 Sep 2020 14:03:59 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.92)
	(envelope-from <pgsql-admin-owner+archive@lists.postgresql.org>)
	id 1kGjeg-0000DX-AC
	for pgsql-admin@arkaria.postgresql.org; Fri, 11 Sep 2020 14:03:58 +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 1kGjeg-0000DN-2n
	for pgsql-admin@lists.postgresql.org; Fri, 11 Sep 2020 14:03:58 +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 1kGjed-0003en-Ip
	for pgsql-admin@postgresql.org; Fri, 11 Sep 2020 14:03:57 +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 08BE3nEr370281;
	Fri, 11 Sep 2020 10:03:49 -0400
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jerry Sievers <gsievers19@comcast.net>
cc: pgsql-admin@postgresql.org
Subject: Re: Pg11 server w/parallel backends unresponsive to
 cancel/terminate... (here are some backtraces)
In-reply-to: <87blico2yh.fsf@jsievers.enova.com>
References: <87imcko3zv.fsf@jsievers.enova.com>
 <87blico2yh.fsf@jsievers.enova.com>
Comments: In-reply-to Jerry Sievers <gsievers19@comcast.net>
	message dated "Fri, 11 Sep 2020 08:30:46 -0500"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <370279.1599833029.1@sss.pgh.pa.us>
Date: Fri, 11 Sep 2020 10:03:49 -0400
Message-ID: <370280.1599833029@sss.pgh.pa.us>
List-Id: <pgsql-admin.lists.postgresql.org>
List-Help: <https://lists.postgresql.org/manage/>
List-Subscribe: <https://lists.postgresql.org/manage/>
List-Post: <mailto:pgsql-admin@lists.postgresql.org>
List-Owner: <mailto:pgsql-admin-owner@lists.postgresql.org>
List-Archive: <https://www.postgresql.org/list/pgsql-admin>
Precedence: bulk

Jerry Sievers <gsievers19@comcast.net> writes:
> Included a few backtraces...

Hmm, seems like you've managed to hit an infinite loop in LLVM :-(

That explains why it's not responding to SIGTERM - LLVM would not
know that it's supposed to check for interrupts every so often.
I'm afraid you'll have to go the immediate-shutdown route (and it'll
still take a few seconds).

Going forward, you should try to update to newest LLVM.  Or disable JIT.

			regards, tom lane