Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759355AbbLBTCH (ORCPT ); Wed, 2 Dec 2015 14:02:07 -0500 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:5043 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756776AbbLBTCF (ORCPT ); Wed, 2 Dec 2015 14:02:05 -0500 Date: Wed, 2 Dec 2015 14:01:38 -0500 From: Chris Mason To: Andrey Ryabinin CC: Dave Jones , Josef Bacik , Linux Kernel , "J. Bruce Fields" , Jeff Layton , David Sterba , Subject: Re: 4.4rc3 nfsd/btrfs kasan warning. Message-ID: <20151202190138.GF8918@ret.masoncoding.com> Mail-Followup-To: Chris Mason , Andrey Ryabinin , Dave Jones , Josef Bacik , Linux Kernel , "J. Bruce Fields" , Jeff Layton , David Sterba , conchur@web.de References: <20151202145907.GA9425@codemonkey.org.uk> <565F0A20.40200@fb.com> <20151202160942.GA16348@codemonkey.org.uk> <20151202171320.GE8918@ret.masoncoding.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23.1 (2014-03-12) X-Originating-IP: [192.168.52.123] X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2015-12-02_11:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1293 Lines: 34 On Wed, Dec 02, 2015 at 09:32:34PM +0300, Andrey Ryabinin wrote: > 2015-12-02 20:14 GMT+03:00 Chris Mason : > > On Wed, Dec 02, 2015 at 11:09:43AM -0500, Dave Jones wrote: > >> On Wed, Dec 02, 2015 at 10:11:28AM -0500, Josef Bacik wrote: > >> > On 12/02/2015 09:59 AM, Dave Jones wrote: > >> > > Got a few of these in the logs this morning after an overnight rsync over nfs > >> > > to an exported btrfs volume. > >> > > >> > That's probably us and not NFS, what line is that in > >> > setup_cluster_bitmap? Thanks, > >> > >> If my math is correct, it's this.. > >> > >> if (entry->offset != bitmap_offset) > >> > >> I don't seem to be able to trigger it on demand unfortunatly. > > > > Is it possible we're blowing the stack? It seems pretty tricky to get a > > stack out of bounds out of this code without flat out blowing through > > it. > > > > I think it just empty bitmaps list. > list_first_entry() can't be used on empty list. Ohh, I was so busy looking for free'd entries I missed that. Good point. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/