From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f69.google.com (mail-wm0-f69.google.com [74.125.82.69]) by kanga.kvack.org (Postfix) with ESMTP id 9E10D6B0005 for ; Fri, 2 Mar 2018 19:40:56 -0500 (EST) Received: by mail-wm0-f69.google.com with SMTP id d23so1670104wmd.1 for ; Fri, 02 Mar 2018 16:40:56 -0800 (PST) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org. [140.211.169.12]) by mx.google.com with ESMTPS id x4si5218412wrd.236.2018.03.02.16.40.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 02 Mar 2018 16:40:55 -0800 (PST) Date: Fri, 2 Mar 2018 16:40:52 -0800 From: Andrew Morton Subject: Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init_zone pageblock alignment Message-Id: <20180302164052.5eea1b896e3a7125d1e1f23a@linux-foundation.org> In-Reply-To: <0485727b2e82da7efbce5f6ba42524b429d0391a.1520011945.git.neelx@redhat.com> References: <1519908465-12328-1-git-send-email-neelx@redhat.com> <0485727b2e82da7efbce5f6ba42524b429d0391a.1520011945.git.neelx@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Daniel Vacek Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Michal Hocko , Vlastimil Babka , Mel Gorman , Pavel Tatashin , Paul Burton , stable@vger.kernel.org On Sat, 3 Mar 2018 01:12:26 +0100 Daniel Vacek wrote: > Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns > where possible") introduced a bug where move_freepages() triggers a > VM_BUG_ON() on uninitialized page structure due to pageblock alignment. b92df1de5d28 was merged a year ago. Can you suggest why this hasn't been reported before now? This makes me wonder whether a -stable backport is really needed... -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org