From: Trond Myklebust Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export. Date: Mon, 18 Aug 2008 15:19:33 -0400 Message-ID: <1219087173.7192.17.camel@localhost> References: <20080818185048.GO20684@miggy.org> Mime-Version: 1.0 Content-Type: text/plain Cc: Grant Coady , linux-kernel , neilb@suse.de, bfields@fieldses.org, linux-nfs@vger.kernel.org To: Athanasius Return-path: In-Reply-To: <20080818185048.GO20684@miggy.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: On Mon, 2008-08-18 at 19:50 +0100, Athanasius wrote: > On Mon, Aug 18, 2008 at 12:02:20PM +1000, Grant Coady wrote: > > I've been using NFS here for years, lately there's something odd going on > > since about a month or so. Previously reported last month: > > http://www.gossamer-threads.com/lists/linux/kernel/951419?page=last > > > > Now with 2.6.27-rc3 on one of the client boxes I get a complete stall > > at odd times when accessing the server's exported directory, cannot > > see a pattern to it. Eventually recovers after a Ctrl-C. Nothing in > > the server or client log files. Not easy to reproduce either. > > I wonder if this is what I've been seeing. I've been otherwise too > busy to properly report it, thinking that *someone* else must also be > seeing it and it's being worked on, else it's a subtle configuration > problem my end. Your lockdep trace basically shows that the rpc layer is blocking for some reason. Could you please try to reproduce the problem, and then do echo 0 >/proc/sys/sunrpc/rpc_debug ...and see what the output from 'dmesg' shows? Cheers Trond