Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp1274218imu; Fri, 4 Jan 2019 17:30:24 -0800 (PST) X-Google-Smtp-Source: ALg8bN4Py15qc120mSQSgdHgQW7hnXqZ0bdmj2IPtUTPzQ2roDWIWQnd6ahls6cWgDub0kjgqEva X-Received: by 2002:a63:de04:: with SMTP id f4mr3424525pgg.292.1546651824054; Fri, 04 Jan 2019 17:30:24 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1546651824; cv=none; d=google.com; s=arc-20160816; b=kW3/52TwJlNqlwsYBmrnyRZwc91LT0QZrlxJRda4TYqZP2K+VSuAG/yKLCFNvzGLDz cZpCxdhbVOB5alarkIZ55mfAoYCinomQpP2z9bNLHPWWSRoS7FsUGvuM8zYejlyMICNy DhDYb0MqpNROu94rB2+zt62D1PhxDfh1/IE/BV4xCOhvJkz6doIJ6qpDLqZLSPGMxE3D eRWkBMDXjjK2YvtlzadTiVmVnEMwZnF1ZuirbTs+/sH6zySCZfbQiPQUKDbgq19R40SA qk9Moxlkbvl4ZqysWr0nbTVj4iScqXtRazLx8ZTj40FKL6qwYwepRY3fnPJmmuDY9Wo7 snsg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=zj1XLXLAEAZzNuzV8OkzIzgzQR5Kzjd8iNta0EMIl8U=; b=w3QX2lEvrGsUl234TMH91lJ7sguC9LrslDvK9yiVC/+wrhNYV6lXdjf/1YbrwXlmhN 7HEAPEyLu3OXcMniFGFG1XqoCOvJRrG3TvLxtjiFqnl9Dj9fYwGo6UQ8zp5N2Hx2Bx9j sZlNXrKtNhILvssQwkH7hlqmKlaRZ5tHDFQCY1PszKubMs7RXzbG4lEYmZfqwPnd3JMG 0xcb+LVgXF+wa/ub5QnwDFO+uCgE8uu3y/U1WynpHlbIMcWALTBVYwvZaaxyuwNcsdck TQIPT90ppx3RCwWV5R3Xq42yIWx9/XZ5H3Jl4betfR8cby7S5QuKkxjqxyroUNtyE/MU buhw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id k134si55966732pga.401.2019.01.04.17.30.08; Fri, 04 Jan 2019 17:30:24 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726311AbfAEB2F (ORCPT + 99 others); Fri, 4 Jan 2019 20:28:05 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:39310 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725862AbfAEB2F (ORCPT ); Fri, 4 Jan 2019 20:28:05 -0500 Received: from localhost.localdomain (c-24-6-170-16.hsd1.ca.comcast.net [24.6.170.16]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id B816515; Sat, 5 Jan 2019 01:28:03 +0000 (UTC) Date: Fri, 4 Jan 2019 17:28:02 -0800 From: Andrew Morton To: Vlastimil Babka Cc: Dmitry Vyukov , syzbot , Andrea Arcangeli , Alexander Potapenko , "Kirill A. Shutemov" , LKML , Linux-MM , linux@dominikbrodowski.net, Michal Hocko , David Rientjes , syzkaller-bugs , xieyisheng1@huawei.com, zhong jiang Subject: Re: KMSAN: uninit-value in mpol_rebind_mm Message-Id: <20190104172802.ce9c4b77577a9c2810f04171@linux-foundation.org> In-Reply-To: <52835ef5-6351-3852-d4ba-b6de285f96f5@suse.cz> References: <000000000000c06550057e4cac7c@google.com> <52835ef5-6351-3852-d4ba-b6de285f96f5@suse.cz> 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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 4 Jan 2019 09:50:31 +0100 Vlastimil Babka wrote: > > Yes, it doesn't and it's not trivial to do. The tool reports uses of > > unint _values_. Values don't necessary reside in memory. It can be a > > register, that come from another register that was calculated as a sum > > of two other values, which may come from a function argument, etc. > > I see. BTW, the patch I sent will be picked up for testing, or does it > have to be in mmotm/linux-next first? I grabbed it. To go further we'd need a changelog, a signoff, description of testing status, reviews, a Fixes: and perhaps a cc:stable ;)