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From: perryh@pluto.rain.com (Perry Hutchison)
To: hrs@freebsd.org
Subject: Re: NFS-exported ZFS instability
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References: <20130102.105304.1817355190360003433.hrs@allbsd.org>
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Hiroki Sato <hrs@freebsd.org> wrote:

>  I have been in a trouble about my NFS server for a long time.
>  The symptom is that it stops working in one or two weeks after
>  a boot ...  It did not panic, just stopped working---while it
>  responded to ping, userland programs seemed not working ...

>  Does anyone see how to debug this?  I guess this is due to a
>  deadlock somewhere ...

If you can afford the overhead, you could try running with some
of the kernel debug options enabled (e.g. WITNESS, INVARIANTS,
MUTEX_DEBUG).  See conf/NOTES for descriptions.