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Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: NFS processes locking up!!
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[nfsd's and other processes locking in 'D' state]

One thing I've seen cause this kind of thing is a disk that needs to be
manually fsck'd.  Try bringing up the system in single user and manually
fsck'ing the volume.  I have no idea what causes this kind of state ---
where the disk is bad, but not calling for an fsck.  It could just be random
bad bits, but I've seen this behaviour more than once.