linux-kernel - Re: nfs3 problem with -rc{2,3}

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Date:	Mon, 18 Jun 2012 13:45:35 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	Ken Moffat <zarniwhoop@...world.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: nfs3 problem with -rc{2,3}

On Mon, 2012-06-18 at 09:42 -0400, Trond Myklebust wrote:
> On Sun, 2012-06-17 at 21:07 +0100, Ken Moffat wrote:
> > I'm seeing problems writing to shared directories mounted as nfs3.
> > Wondering if anyone else is seeing similar problems ?
> > 
> >  I noticed this last week with -rc2 (my first new kernel since
> > 3.4.0), but haven't managed to find a minimal test case to replicate
> > it.
> > 
> >  The first problem was with firefox - I use it to download tarballs
> > and patches to a shared /sources.  The first download worked, maybe
> > also another, but some time later one stalled and firefox stopped
> > refreshing its window.  Looked as if it successfully created
> > packagename.tar.gz.part, but with an empty packagename.tar.gz.
> > 
> >  I killed firefox, then I used wget to download to a local filesystem
> > and then tried to cp it to the shared /sources - cp hung indefinitely,
> > apparently after completing the transfer.
> > 
> >  At this time I tried to run a script *in* /sources which hung
> > trying to rm a file [ worked fine when I killed it, ssh'd to the
> > server, and ran it locally ].
> > 
> >  I've also got regular backup scripts which wrap rsync writes to a
> > different writable directory on the server.  These stall with -rc2
> > and -rc3, and get killed by SIGINT when I eventually reboot or shut
> > down.
> > 
> >  I tried using only the rsync command and playing with just an rsync
> > of a single file in a directory, but that doesn't provoke the
> > problem.  I've also tried various attempts to cp or move a file
> > to the shared directory, but again without problems.  It seems that
> > things are fine until something provokes the problem, then all
> > updates stall.  This makes it a bit hard to get a reliable and
> > simple testcase.
> > 
> >  I suppose I'll have to start to bisect using the backup script as
> > my test case (booted rc2 earlier, did nothing except ssh and allow
> > fcron to run it - it stalled.  built rc3, booted that, fcron tried
> > to run the incomplete backup, again it has stalled).
> > 
> >  Config from rc2 attached, any suggestions are welcome.
> 
> Is this a problem with the client or with the server, and have you tried
> seeing if the fixes that were merged into -rc3 help?

Doh... Ignore the second half of the above sentence. error=ENOCOFFEE.

I would still like to know whether this is a client or server issue
(i.e. whether a downgrade of one or the other to 3.4 fixes the problem).
-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com