Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992653AbdD2B67 (ORCPT ); Fri, 28 Apr 2017 21:58:59 -0400 Received: from scorn.kernelslacker.org ([45.56.101.199]:38098 "EHLO scorn.kernelslacker.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1034846AbdD2B6u (ORCPT ); Fri, 28 Apr 2017 21:58:50 -0400 Date: Fri, 28 Apr 2017 21:58:47 -0400 From: Dave Jones To: Al Viro Cc: Linux Kernel Subject: Re: iov_iter_pipe warning. Message-ID: <20170429015847.p5gpz5px6vybewvs@codemonkey.org.uk> Mail-Followup-To: Dave Jones , Al Viro , Linux Kernel References: <20170412152600.GP29622@ZenIV.linux.org.uk> <20170412162709.bn5qfk4seues3yos@codemonkey.org.uk> <20170412170723.GQ29622@ZenIV.linux.org.uk> <20170412190318.srkkdytf2ebrjzrg@codemonkey.org.uk> <20170421175430.GT29622@ZenIV.linux.org.uk> <20170428152955.mafs3f22srmm34aw@codemonkey.org.uk> <20170428164313.GK29622@ZenIV.linux.org.uk> <20170428165024.ofyl2atpjwohekqa@codemonkey.org.uk> <20170428172024.GL29622@ZenIV.linux.org.uk> <20170428182511.GM29622@ZenIV.linux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170428182511.GM29622@ZenIV.linux.org.uk> User-Agent: NeoMutt/20170306 (1.8.0) X-Spam-Note: SpamAssassin invocation failed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 629 Lines: 17 On Fri, Apr 28, 2017 at 07:25:12PM +0100, Al Viro wrote: > On Fri, Apr 28, 2017 at 06:20:25PM +0100, Al Viro wrote: > > On Fri, Apr 28, 2017 at 12:50:24PM -0400, Dave Jones wrote: > > > currently running v4.11-rc8-75-gf83246089ca0 > > > > > > sunrpc bit is for the other unrelated problem I'm chasing. > > > > > > note also, I saw the backtrace without the fs/splice.c changes. > > > > Interesting... Could you add this and see if that triggers? > > Gyah... It's a bloody dumb braino in iov_iter_revert() for pipe-backed > ones. Sorry, the oneliner below should fix it. 5 hrs in, looking good so far. Dave