From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:58928 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752894AbcJKPVP (ORCPT ); Tue, 11 Oct 2016 11:21:15 -0400 Subject: Re: btrfs bio linked list corruption. To: Dave Jones , Al Viro , Josef Bacik , David Sterba , , Linux Kernel References: <20161011144507.okg6baqvodn2m2lh@codemonkey.org.uk> <20161011151139.GD19539@ZenIV.linux.org.uk> <20161011151904.qimdy3rra63fri7n@codemonkey.org.uk> From: Chris Mason Message-ID: Date: Tue, 11 Oct 2016 11:20:41 -0400 MIME-Version: 1.0 In-Reply-To: <20161011151904.qimdy3rra63fri7n@codemonkey.org.uk> Content-Type: text/plain; charset="windows-1252"; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 10/11/2016 11:19 AM, Dave Jones wrote: > On Tue, Oct 11, 2016 at 04:11:39PM +0100, Al Viro wrote: > > On Tue, Oct 11, 2016 at 10:45:08AM -0400, Dave Jones wrote: > > > This is from Linus' current tree, with Al's iovec fixups on top. > > > > Those iovec fixups are in the current tree... > > ah yeah, git quietly dropped my local copy when I rebased so I didn't notice. > > > TBH, I don't see anything > > in splice-related stuff that could come anywhere near that (short of > > some general memory corruption having random effects of that sort). > > > > Could you try to bisect that sucker, or is it too hard to reproduce? > > Only hit it the once overnight so far. Will see if I can find a better way to > reproduce today. This call trace is reading metadata so we can finish the truncate. I'd say adding more memory pressure would make it happen more often. I'll try to trigger. -chris