From: Grant Coady <gcoady.lk@gmail.com>
Subject: Re: 2.6.17.8 - do_vfs_lock: VFS is out of sync with lock
	manager!
Date: Fri, 11 Aug 2006 10:30:27 +1000
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Cc: nfs@lists.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Trond Myklebust <trond.myklebust@fys.uio.no>
To: "Jesper Juhl" <jesper.juhl@gmail.com>
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On Fri, 11 Aug 2006 00:37:35 +0200, "Jesper Juhl" <jesper.juhl@gmail.com> wrote:

>On 09/08/06, Jesper Juhl <jesper.juhl@gmail.com> wrote:
>> On 09/08/06, Grant Coady <gcoady.lk@gmail.com> wrote:
>> > On Tue, 8 Aug 2006 16:39:54 +0200, "Jesper Juhl" <jesper.juhl@gmail.com> wrote:
>> >
>> > >I have some webservers that have recently started reporting the
>> > >following message in their logs :
>> > >
>> > >  do_vfs_lock: VFS is out of sync with lock manager!
>> > >
>> > >The serveres kernels were upgraded to 2.6.17.8 and since the upgrade
>> > >the message started appearing.
>> > >The servers were previously running 2.6.13.4 without experiencing this problem.
>> > >Nothing has changed except the kernel.
>> > >
>> > >I've googled a bit and found this mail
>> > >(http://lkml.org/lkml/2005/8/23/254) from Trond saying that
>> > >"The above is a lockd error that states that the VFS is failing to track
>> > >your NFS locks correctly".
>> > >Ok, but that doesn't really help me resolve the issue. The servers are
>> > >indeed running NFS and access their apache DocumentRoots from a NFS
>> > >mount.
>> > >
>> > >Is there anything I can do to help track down this issue?
>> >
>> > I don't have an answer, but offer this observation: five boxen running
>> > 2.6.17.8 doing six simultaneous
>> >
>> >   bzcat /home/share/linux-2.6/patch-2.6.18-rc4.bz2|patch -p1
>> >
>> > didn't burp.  The /home/share/ is an NFS export from another box running
>> > 2.4.33-rc3a, me not sure if this was exercising any NFS locking as the
>> > NFS source file was only opened for non-exclusive read-only.
>> >
>> The NFS server here is running 2.6.11.11 and doesn't seem to be
>> reporting any problems. But I now have two more of my webservers (both
>> running 2.6.17.8) that have started to complain about "do_vfs_lock:
>> VFS is out of sync with lock manager!"
>>
>> I've not found a way to cause the message to be repported at will unfortunately.
>>
>Today 3 more of my webservers running 2.6.17.8 reported this message.
>The machines all seem to be running fine still, so it doesn't seem to
>be a serious problem, but it would still be nice to get it fixed ;)

Do you have some test case other than web server that triggers it?  
I can try it here, recently did much NFS testing reported under 
2.4.33-rc1 or -rc2 on lkml to try sort a vfs_unlink issue.

My web server here is low volume, not a good test situation -- plus 
it no longer runs under 2.6 and I don't want to take it down too often 
to sort out why.  Once it could dual boot 2.4 or 2.6 without trouble, 
but that option fell apart when 2.6.16 came out.

Grant.

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