From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2941227-1520037656-2-8186316874760413176 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='US-ASCII' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1520037656; b=sXR1XhpkmbnLs+5DuWu5UYc4O58uHARV+ZskKXlWNs0qVut gTo0sQOWt1DCWLSskfREJDv4XCl2BoA+ZbjDPkj6Jfb4QyM08mxG/RR6scu0cMDK wHogN7AgEZ72gbc6UCy0lCpX5XPE2rl8y1lDFqvUDj5I3hZL+hrioeNx7k6IfqvN 9T3mGb53ejrDtbsERowHaII5D+rde/dTQYWkSi79P48e30GXDGZY2sMAJtQamh63 BT+1YZTLY7s4uezGfjiNbk1JdgX1jzcjvvnXLDaiJTyfLgQ+Xg01bM7Erp2kr3pZ nzuQTmShL0J99qQ/bpUYISl4uw123kXQm8sUIYg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=date:from:to:cc:subject:message-id :in-reply-to:references:mime-version:content-type :content-transfer-encoding:sender:list-id; s=arctest; t= 1520037656; bh=aG0YQvW2Cm6rpGaldhQ/GRXYniQVrqafTo7gMPwKXS8=; b=K d9nYDJ5l0mb7v72WIGwkHR9vPPXzNkpEgxSLLeIePEPDCobXw3UVLhYiaR4QKRKR +6cid6pC2MW0SlwQp4yzBPZHqD2GC/z85mKSw0qq6S0oLM7RWgugNylCxPyv1xIh eDB/zsr5uGMMmCCEvg/l9toeakpxsSR1Y65EX1PQOv/oOanb8NGg5CYPuhbs++Yx ObND7TI2CTsbC117IARxOm00UpOXQrLupPMYB0E7pKeBtBS069sPGjRmuAm4qnis +6aukFbBzBVafvXeGC9a2SK4gERTey0H8N079BcVUhTTPp+yzfy+bHSM0pBX9HOd 2OAOOofr53ZHla/yv7A3Q== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linux-foundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linux-foundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linux-foundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linux-foundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752697AbeCCAkz (ORCPT ); Fri, 2 Mar 2018 19:40:55 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:44408 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752274AbeCCAky (ORCPT ); Fri, 2 Mar 2018 19:40:54 -0500 Date: Fri, 2 Mar 2018 16:40:52 -0800 From: Andrew Morton 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 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> X-Mailer: Sylpheed 3.6.0 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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...