From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Sandeen Subject: Re: 2.6.35 causes deadlock when snapshotting root lv Date: Fri, 18 Jun 2010 14:19:44 -0500 Message-ID: <4C1BC6D0.2030203@sandeen.net> References: <4C1A2839.5010407@cfl.rr.com> <20100617142731.GA10071@redhat.com> <4C1A4A74.9070105@cfl.rr.com> <20100617162747.GA21336@redhat.com> <4C1ACBF1.3050603@cfl.rr.com> <4C1BC125.4090902@sandeen.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4C1BC125.4090902@sandeen.net> Sender: linux-fsdevel-owner@vger.kernel.org To: Phillip Susi Cc: Mike Snitzer , device-mapper development , linux-fsdevel@vger.kernel.org, Eric Sandeen List-Id: dm-devel.ids Eric Sandeen wrote: > Phillip Susi wrote: >> On 06/17/2010 12:27 PM, Mike Snitzer wrote: >>>>> http://git.kernel.org/linus/18e9e5104fcd9a9 >>>>> http://git.kernel.org/linus/6b0310fbf087ad6 >>>> Yes, these do look suspicious. I'll test reverting them tonight. >>> OK, I'd suggest reverting the VFS change (18e9e5104fcd9a9) first. >> Turns out it was 6b0310fbf087ad6 that did it. CCing Eric Sandeen since >> he wrote it. Eric, this patch seems to cause a deadlock when taking an >> lvm snapshot of the root lv. Any idea why? > > I'll look. A sysrq-w when it hangs up would probably be enlightening... > > -Eric FWIW simple freeze/unfreeze works for me, and lvm snap on a non-root ext4 partition seems to as well. I'm out for a few days and probably won't get a root lv set up to test anytime soon. If you can provide sysrq-w output that probably will be a big help if it doesn't end up being obvious by inspection. :) Thanks -Eric