Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751248AbcCFFbK (ORCPT ); Sun, 6 Mar 2016 00:31:10 -0500 Received: from mail-pf0-f180.google.com ([209.85.192.180]:32881 "EHLO mail-pf0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751122AbcCFFbI (ORCPT ); Sun, 6 Mar 2016 00:31:08 -0500 Date: Sat, 5 Mar 2016 20:31:03 -0900 From: Kent Overstreet To: Andrea Righi Cc: Shaohua Li , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: multipath: I/O hanging forever Message-ID: <20160306053103.GA31060@kmo-pixel> References: <20160229015333.GA3101@Dell> <20160229034616.GA2682@Dell> <20160304173044.GA2636@Dell> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160304173044.GA2636@Dell> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 817 Lines: 17 On Fri, Mar 04, 2016 at 10:30:44AM -0700, Andrea Righi wrote: > On Sun, Feb 28, 2016 at 08:46:16PM -0700, Andrea Righi wrote: > > On Sun, Feb 28, 2016 at 06:53:33PM -0700, Andrea Righi wrote: > > ... > > > I'm using 4.5.0-rc5+, from Linus' git. I'll try to do a git bisect > > > later, I'm pretty sure this problem has been introduced recently (i.e., > > > I've never seen this issue with 4.1.x). > > > > I confirm, just tested kernel 4.1 and this problem doesn't happen. > > Alright, I had some spare time to bisect this problem and I found that > the commit that introduced this issue is c66a14d. > > So, I tried to revert the commit (with some changes to fix conflicts and > ABI changes) and now multipath seems to work fine for me (no hung task). Is it hanging on first IO, first large IO, or just randomly?