From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f47.google.com (mail-pa0-f47.google.com [209.85.220.47]) by kanga.kvack.org (Postfix) with ESMTP id 3CC516B0038 for ; Thu, 9 Oct 2014 15:14:41 -0400 (EDT) Received: by mail-pa0-f47.google.com with SMTP id rd3so285308pab.6 for ; Thu, 09 Oct 2014 12:14:40 -0700 (PDT) Received: from userp1040.oracle.com (userp1040.oracle.com. [156.151.31.81]) by mx.google.com with ESMTPS id ub8si1682950pac.5.2014.10.09.12.14.39 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Thu, 09 Oct 2014 12:14:39 -0700 (PDT) Message-ID: <5436DDEB.5090004@oracle.com> Date: Thu, 09 Oct 2014 15:11:39 -0400 From: Sasha Levin MIME-Version: 1.0 Subject: Re: [PATCH 0/5] mm: poison critical mm/ structs References: <1412041639-23617-1-git-send-email-sasha.levin@oracle.com> <20141001140725.fd7f1d0cf933fbc2aa9fc1b1@linux-foundation.org> <542C749B.1040103@oracle.com> In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Dickins Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, mgorman@suse.de On 10/02/2014 05:23 AM, Hugh Dickins wrote: > I'm glad to hear they've confirmed some vm_area_struct corruption: > any ideas on where that's coming from? Hugh, I think that what we're seeing isn't a corruption of vm_area_struct per-se, but something weirder. I've poisoned every spot where vm_area_struct is allocated, and yet there seems to be nothing that's hitting that field before we end up using a "zeroed out" vm_area_struct. The results are the same both with and without kasan, there seems to be no corruption happening anywhere, but we somehow end up with an empty vm_area_struct. It also somewhat makes sense considering that we're seeing no slub corruption either. Either something is zeroing out *exactly* vm_area_struct, or it's not really corruption... Thanks, Sasha -- 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