Re: NFS client broken in Linus' tip

From: Takashi Iwai <tiwai@suse.de>
To: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
	linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	Al Viro <viro@zeniv.linux.org.uk>, Christoph Hellwig <hch@lst.de>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: NFS client broken in Linus' tip
Date: Mon, 03 Feb 2014 10:43:33 +0100	[thread overview]
Message-ID: <s5hioswy1iy.wl%tiwai@suse.de> (raw)
In-Reply-To: <1391378678.8123.5.camel@leira.trondhjem.org>

At Sun, 02 Feb 2014 17:04:38 -0500,
Trond Myklebust wrote:
> 
> On Sun, 2014-02-02 at 12:27 +0000, Russell King - ARM Linux wrote:
> > On Sat, Feb 01, 2014 at 01:03:28AM +0000, Russell King - ARM Linux wrote:
> > > On Fri, Jan 31, 2014 at 03:59:30PM -0500, Trond Myklebust wrote:
> > > > On Thu, 2014-01-30 at 15:38 +0000, Russell King - ARM Linux wrote:
> > > > > On Thu, Jan 30, 2014 at 06:32:08AM -0800, Christoph Hellwig wrote:
> > > > > > On Thu, Jan 30, 2014 at 02:27:52PM +0000, Russell King - ARM Linux wrote:
> > > > > > > Yes and no.  I still end up with an empty /etc/mtab, but the file now
> > > > > > > exists.  However, I can create and echo data into /etc/mtab, but it seems
> > > > > > > that can't happen at boot time.
> > > > > > 
> > > > > > Odd.  Can you disable CONFIG_NFSD_V3_ACL for now to isolate the issue?
> > > > > 
> > > > > Unfortunately, that results in some problem at boot time, which
> > > > > ultimately ends up with the other three CPUs being stopped, and
> > > > > hence the original reason scrolls off the screen before it can be
> > > > > read... even at 1920p.
> > > > > 
> > > > Hi Russell,
> > > > 
> > > > The following patch fixes the issue for me.
> > > 
> > > It doesn't entirely fix the issue for me, instead we've got even weirder
> > > behaviour:
> > > 
> > > root@cubox-i4:~# ls -al test
> > > ls: cannot access test: No such file or directory
> > > root@cubox-i4:~# touch test
> > > root@cubox-i4:~# ls -al test
> > > -rw-r--r-- 1 root root 0 Feb  1 01:01 test
> > > root@cubox-i4:~# echo foo > test
> > > root@cubox-i4:~# ls -al test
> > > -rw-r--r-- 1 root root 4 Feb  1 01:01 test
> > > root@cubox-i4:~# cat test
> > > foo
> > > root@cubox-i4:~# rm test
> > > root@cubox-i4:~# echo foo > test
> > > -bash: test: Operation not supported
> > > root@cubox-i4:~# ls -al test
> > > -rw-r--r-- 1 root root 0 Feb  1 01:01 test
> > 
> > FYI, I just tested Linus' tip, and NFS is still broken.
> > 
> Hi Russell,
> 
> The following patch should fix the above problem. It needs to be applied
> on top of the one I sent you previously.

I've hit the same problem, and your two patches seem fixing it.
I tested them on top of 3.14-rc1.  Feel free to take my tested-by tag

  Tested-by: Takashi Iwai <tiwai@suse.de>

> In addition, you will want to
> apply Noah Massey's patch from
> http://lkml.kernel.org/r/1391135472-9639-1-git-send-email-Noah.Massey@gmail.com 

Do I still need to test this one, too?

Thanks!

Takashi