From: Trond Myklebust Subject: Re: [regression] nfs4: 30 second delay during umount of remote fs on system shutdown Date: Thu, 28 Feb 2008 20:55:16 -0800 Message-ID: <1204260916.7213.5.camel@heimdal.trondhjem.org> References: <200802281829.16343.elendil@planet.nl> <1204235218.7109.13.camel@heimdal.trondhjem.org> <200802290203.06241.elendil@planet.nl> Mime-Version: 1.0 Content-Type: text/plain Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org To: Frans Pop Return-path: Received: from pat.uio.no ([129.240.10.15]:40380 "EHLO pat.uio.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755004AbYB2EzV (ORCPT ); Thu, 28 Feb 2008 23:55:21 -0500 In-Reply-To: <200802290203.06241.elendil-EIBgga6/0yRmR6Xm/wNWPw@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Fri, 2008-02-29 at 02:03 +0100, Frans Pop wrote: > On Thursday 28 February 2008, Trond Myklebust wrote: > > On Thu, 2008-02-28 at 18:29 +0100, Frans Pop wrote: > > > I have verified that portmap is also not running during S31umountnfs.sh > > > with 2.6.24, so apparently there has been a change in the kernel that > > > has made umount look for portmap and cause the 30 second delay if it is > > > not running. > > > > You are probably seeing the effect of lockd going down: it always > > attempts to unregister from the portmapper (and no, this is _not_ new > > behaviour). > > It is _very much_ new behavior because as soon as I boot (and shut down) > with a 2.6.24 kernel the problem completely disappears. Userland is *100% > identical* between my tests. The "new behaviour" is that we fixed a bug whereby the lockd code was failing to flush signals before attempting the rpc unregister. The sad fact is that userland appears to have been 100% broken for some time. The difference is that it was able to get away with it earlier... > > If debian is killing the portmapper while lockd is still up, then that > > is a definite debian bug... > > I have no idea about that. AFAICT lockd is not even running (at least, > there's no process named lockd, even when the system is running normally. > Isn't lockd an nfs3 thing? I'm using nfs4 here. NFSv4 has a delegation recall server to kill. Same difference... Trond