NFS processes locking up!!

[Kris Kennaway]

On Thu, Jun 01, 2006 at 03:02:53PM -0700, Mark Morley wrote:
> Hi all,
> 
> We have an NFS server (amd64) running FreeBSD 6.1-STABLE.  It serves a dozen
> or so clients which are a mix of FreeBSD 4.11 and 6.1-STABLE.  All NFS traffic
> is on a dedicated gigabit switched network.
> 
> Periodically we have a problem where it will stop serving up files.  Running 'ps'
> on the server shows a number of processes stuck in the 'D' state -- "a process in
> disk (or other short term, uninter-ruptible) wait".
> 
> Usually this includes all the nfsd processes as well as any others that are trying
> to access the same disk drive.  Any commands issued like 'du', 'sync', etc. go into
> the same state and never exit.  It is impossible to kill any of these processes.
> 
> We can pretty much force this to happen by running a large 'find' or something
> similar on the exported file system, although it will happen itself eventually
> without any such commands being run.
> 
> Our only option (as far as we can tell) is to reboot the server, which results in
> a very long fsck period (it's over a terrabyte of disk space).
> 
> This doesn't seem to be a hardware issue.  This is a brand new server in all respects
> (all new hardware, new RAID) and we saw the exact same issue on the machine that it
> replaced (which was running 4.11 on i386).
> 
> Any thoughts on this?  Any more info I should provide?

Please post your kernel config.

Kris
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