From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id 14BAF440846 for ; Thu, 24 Aug 2017 08:38:12 -0400 (EDT) Received: by mail-pg0-f70.google.com with SMTP id g10so2937976pgc.2 for ; Thu, 24 Aug 2017 05:38:12 -0700 (PDT) Received: from foss.arm.com (foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id o128si2746962pfo.226.2017.08.24.05.38.10 for ; Thu, 24 Aug 2017 05:38:11 -0700 (PDT) Date: Thu, 24 Aug 2017 13:36:48 +0100 From: Mark Rutland Subject: Re: Intermittent memory corruption with v4.13-rc6+ and earlier Message-ID: <20170824123647.GA19698@leverpostej> References: <20170824113743.GA14737@leverpostej> <20170824114833.GH5943@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170824114833.GH5943@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: linux-kernel@vger.kernel.org, syzkaller@googlegroups.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Alexander Viro , Andrew Morton , Jan Kara , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Vlastimil Babka , will.deacon@arm.com On Thu, Aug 24, 2017 at 01:48:34PM +0200, Michal Hocko wrote: > On Thu 24-08-17 12:37:43, Mark Rutland wrote: > > Hi, > > > > I'm chasing intermittent memory corruption bugs seen at least on rc5, > > rc6, and yesterday's HEAD (98b9f8a4549909c6), on arm64. > > > > It looks like we make use of dangling references to a freed struct file, > > which is caught by KASAN. Without KASAN, I see a number of other > > intermittent issues that I suspect are the result of this memory > > corruption. I've included an example splat below, complete with KASAN's > > alloc/free traces at the end of this mail. > > Is it possible this is the same issue as the one fixed by > http://lkml.kernel.org/r/20170823211408.31198-1-ebiggers3@gmail.com? That sounds plausible, and so far the fix seems to help. Thanks for the pointer! I'll leave that running for a while, just in case. Thanks, Mark. -- 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