From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from magic.merlins.org ([209.81.13.136]:57136 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753118AbaENXrN (ORCPT ); Wed, 14 May 2014 19:47:13 -0400 Date: Wed, 14 May 2014 16:47:06 -0700 From: Marc MERLIN To: Chris Murphy Cc: Btrfs BTRFS Subject: Re: 3.15rc5 deadlock Message-ID: <20140514234706.GC12792@merlins.org> References: <20140514114027.GA32301@merlins.org> <5373616E.9070409@fb.com> <20140514205519.GB12849@merlins.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Wed, May 14, 2014 at 05:13:20PM -0600, Chris Murphy wrote: > > On May 14, 2014, at 2:55 PM, Marc MERLIN wrote: > > > INFO: task btrfs:13329 blocked for more than 120 seconds. > > Pretty much anytime blocked for more than 120 seconds is reported, devs ask for sysrq-w. Typically that translates into three steps: > > echo 1 > /proc/sys/kernel/sysrq > echo w > /proc/sysrq-trigger > dmesg > > https://www.kernel.org/doc/Documentation/sysrq.txt I took that just in case, but it's big (too long to be accepted on the list), and inconvenient to share each time. I was hoping the output of legolas:~# ps -eo pid,user,args,wchan | grep btrfs would do, but if not, I can upload the sysrq I have in my syslog. Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901