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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 F0E39C64E7B for ; Mon, 30 Nov 2020 18:50:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6396320725 for ; Mon, 30 Nov 2020 18:50:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hp31rofR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6396320725 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D61888D0001; Mon, 30 Nov 2020 13:50:53 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D37446B005C; Mon, 30 Nov 2020 13:50:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C4DE28D0001; Mon, 30 Nov 2020 13:50:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0244.hostedemail.com [216.40.44.244]) by kanga.kvack.org (Postfix) with ESMTP id ACE3F6B0036 for ; Mon, 30 Nov 2020 13:50:53 -0500 (EST) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 69E1F180B5FB5 for ; Mon, 30 Nov 2020 18:50:53 +0000 (UTC) X-FDA: 77541976386.29.seat56_2200e8a273a4 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin29.hostedemail.com (Postfix) with ESMTP id 229941815EB6E for ; Mon, 30 Nov 2020 18:16:45 +0000 (UTC) X-HE-Tag: seat56_2200e8a273a4 X-Filterd-Recvd-Size: 2286 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf09.hostedemail.com (Postfix) with ESMTP for ; Mon, 30 Nov 2020 18:16:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=LfoTFRysNcteXF4WoH+Wefae7lmhgRvxwaPAWGwNfWo=; b=hp31rofROGoSDJyrbwlSbTyfr8 UK5zWY2ZNhzmZiDIQui/Ocs+FIeFerSpv9MPlv8smJYNjIvEPQged3o0PvoaGTR/1bnwRHhOlI6su RB8fUBfxAk6xyn3XbdQlhzJb5CJ8RN0Xpe62m+2qiX8Sn2GEkYGJANuY6kmfxKU1TXHgoZe59+pDe UNuW0jxTl2fR2xCq3r6TIUmcIJK6YjtClyEm3nfMB5VNqPqwTbg0DpwByIUYqRZOhZrfxBx61/Phu VU4H0EKrVQhr4DvUQQ3KqmwvyRJ+fL/boJ3Ofl9hk2S9cF4mPEZWGIDDrCyTqBTiV63kuNlILa42R for8s4MQ==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kjniw-0007Y4-CL; Mon, 30 Nov 2020 18:16:30 +0000 Date: Mon, 30 Nov 2020 18:16:30 +0000 From: Matthew Wilcox To: "Gong, Sishuai" Cc: "cl@linux.com" , "penberg@kernel.org" , "rientjes@google.com" , "iamjoonsoo.kim@lge.com" , "akpm@linux-foundation.org" , "linux-mm@kvack.org" Subject: Re: Race: data race between shmem_getpage() and mapping_set_gfp_mask() Message-ID: <20201130181630.GF4327@casper.infradead.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Bogosity: Ham, tests=bogofilter, spamicity=0.000661, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 30, 2020 at 06:14:29PM +0000, Gong, Sishuai wrote: > Hi, > > We found a data race in linux kernel 5.3.11 that we are able to reproduce in x86 under specific interleavings. Currently, we are not sure about the consequence of this race so we would like to confirm with the community if this can be a harmful bug. Are you going to be sending a lot of these? There's no shortage of actual bugs hit with syzcaller. What we're short on is people to review, analyse and fix bugs.