linux-kernel - Re: regression: am-utils stopped working in 2.6.25-rc*

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Date:	Tue, 01 Apr 2008 18:14:23 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Meelis Roos <mroos@...ux.ee>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-nfs@...r.kernel.org
Subject: Re: regression: am-utils stopped working in 2.6.25-rc*


On Tue, 2008-04-01 at 17:07 -0400, J. Bruce Fields wrote:
> On Fri, Mar 28, 2008 at 03:20:18PM +0200, Meelis Roos wrote:
> > Current 2.6.25-rc* kernels have broken am-utils (NFS-based automounter) 
> > support. No error messages, just "no such file or directory" when trying 
> > to enter /net/anotherhostname. Just tried 2.6.24 and that worked fine. 
> > am-utils is the latest in Debian unstable, 6.1.5-9.
> > 
> > Earliest 2.6.25-rc currently tested was 2.6.25-rc3+git as of 20080304. 
> > This version reports 
> > Invalid hostname "pid3477@...ott:/net" in NFS lock request
> > into dmesg and am-utils does not work.
> > 
> > 2.6.25-rc4+git as of 20080310 and later ones do not show this message 
> > but am-utils does still not work.
> > 
> > Will try bisecting it further.
> 
> Have you figured out anything more?  Can strace show exactly which
> system call is  failing?

See the bugzilla report:
  http://bugzilla.kernel.org/show_bug.cgi?id=10349

I'm still waiting to hear back from Meelis, but to me this looks like an
am-utils bug.

AFAICS, am-utils advertises a binary NFS mount structure version of '6',
to the mount() syscall, but internally they only initialise the
equivalent of a version '4' structure.
When
     http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git&a=commitdiff&h=f9c3a3802119a2d30f3e4a69aef30a81e09d0209
was merged, then this failure to initialise the selinux 'context' field
causes mount() to return an EINVAL.

Cheers
  Trond

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