From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:22421 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751469AbaEHCsR (ORCPT ); Wed, 7 May 2014 22:48:17 -0400 Date: Thu, 8 May 2014 10:48:04 +0800 From: Liu Bo To: Kenny MacDermid Cc: linux-btrfs@vger.kernel.org Subject: Re: btrfs issues in 3.14 Message-ID: <20140508024803.GA3407@localhost.localdomain> Reply-To: bo.li.liu@oracle.com References: <20140507022245.GA15783@localhost.localdomain> 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 07, 2014 at 09:35:06AM -0300, Kenny MacDermid wrote: > On Tue, May 6, 2014 at 11:22 PM, Liu Bo wrote: > > > > What does sysrq+w say when the hang happens? > > The whole system isn't hung, I may have explained that wrong. The > system will hang if I try to shutdown, and the process will hang if I > try to kill -9 it. > > It looks like the browser is in this state currently so I did an 'echo > w >/proc/sysrq-trigger' and have attached the full dmesg with the > browser issues and the output. Those stacks show the blocked tasks are waiting for a page's writeback, but they don't show what blocks the endio process of that page. I'd recommand you to try the lastest 3.15.0-rc4 or btrfs-next, as many fixes are merged during this period. thanks, -liubo