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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE91FC47404 for ; Thu, 10 Oct 2019 00:04:22 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B752121848 for ; Thu, 10 Oct 2019 00:04:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="KO2fr0Zw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B752121848 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 814086B0003; Wed, 9 Oct 2019 20:04:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 79DBC6B0005; Wed, 9 Oct 2019 20:04:21 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 663308E0003; Wed, 9 Oct 2019 20:04:21 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0033.hostedemail.com [216.40.44.33]) by kanga.kvack.org (Postfix) with ESMTP id 3DAA66B0003 for ; Wed, 9 Oct 2019 20:04:21 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id D2012824CA3D for ; Thu, 10 Oct 2019 00:04:20 +0000 (UTC) X-FDA: 76025927880.20.north22_7d38f37224749 X-HE-Tag: north22_7d38f37224749 X-Filterd-Recvd-Size: 2554 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Thu, 10 Oct 2019 00:04:20 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0CDDF206C0; Thu, 10 Oct 2019 00:04:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570665859; bh=0jWhLB0AitAGeTk8uwHb4sWxNylEEp1Z5cSAq6u4bHo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=KO2fr0Zwkli3KGUSh2qc7P9PK4qBKVwVx+oPFzKFWlWzJfQp26ZNS63n90J7z/xEO OY2y+6gSF3DxWMRBNiLNTgqCR/VIKmEV7nt3iO54Ry32FQ7ZiRuxdcv087I5fjVVys Ufdj92zu8LIw7MBLpuT5Q1ibuhvI/p9heRTNILr8= Date: Wed, 9 Oct 2019 17:04:18 -0700 From: Andrew Morton To: Shakeel Butt Cc: Qian Cai , Wei Yang , Konstantin Khlebnikov , Rik van Riel , Linux MM , LKML , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , linux-s390@vger.kernel.org, Stephen Rothwell Subject: Re: "reuse mergeable anon_vma as parent when fork" causes a crash on s390 Message-Id: <20191009170418.b7954140de86e422f3818381@linux-foundation.org> In-Reply-To: References: <1570656570.5937.24.camel@lca.pw> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 9 Oct 2019 15:21:11 -0700 Shakeel Butt wrote: > On Wed, Oct 9, 2019 at 2:30 PM Qian Cai wrote: > > > > The linux-next commit "mm/rmap.c: reuse mergeable anon_vma as parent when fork" > > [1] causes a crash on s390 while compiling some C code. Reverted it fixes the > > issue. > > > > [1] https://lore.kernel.org/lkml/20191004160632.30251-1-richardw.yang@linux.intel.com/ > > > > ... > > Our internal syzbot instance also hit this bug and bisected to the same patch. Thanks, I'll drop mm-rmapc-reuse-mergeable-anon_vma-as-parent-when-fork.patch.