From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1530FC4332F for ; Mon, 7 Nov 2022 15:44:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231792AbiKGPoF (ORCPT ); Mon, 7 Nov 2022 10:44:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231302AbiKGPoC (ORCPT ); Mon, 7 Nov 2022 10:44:02 -0500 Received: from outbound-smtp07.blacknight.com (outbound-smtp07.blacknight.com [46.22.139.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57E03766F for ; Mon, 7 Nov 2022 07:44:01 -0800 (PST) Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp07.blacknight.com (Postfix) with ESMTPS id D35A81C371E for ; Mon, 7 Nov 2022 15:43:51 +0000 (GMT) Received: (qmail 16486 invoked from network); 7 Nov 2022 15:43:51 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[84.203.198.246]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 7 Nov 2022 15:43:51 -0000 Date: Mon, 7 Nov 2022 15:43:50 +0000 From: Mel Gorman To: "Akira Naribayashi (Fujitsu)" Cc: "akpm@linux-foundation.org" , "vbabka@suse.cz" , "rientjes@google.com" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: Re: [PATCH] mm, compaction: fix fast_isolate_around() to stay within boundaries Message-ID: <20221107154350.34brdl3ms2ve5wud@techsingularity.net> References: <20221027132557.5f724149bd5753036f41512a@linux-foundation.org> <20221031073559.36021-1-a.naribayashi@fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 07, 2022 at 12:32:34PM +0000, Akira Naribayashi (Fujitsu) wrote: > > Under what circumstances will this panic occur? I assume those > > circumstnces are pretty rare, give that 6e2b7044c1992 was nearly two > > years ago. > > > > Did you consider the desirability of backporting this fix into earlier > > kernels? > > > Panic can occur on systems with multiple zones in a single pageblock. > Please provide an example of the panic and the zoneinfo. > The reason it is rare is that it only happens in special configurations. How is this special configuration created? -- Mel Gorman SUSE Labs