From owner-freebsd-fs@FreeBSD.ORG  Sun Jun 10 22:56:29 2007
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To: current@freebsd.org
Date: Sun, 10 Jun 2007 15:31:58 -0700
From: Bakul Shah <bakul@bitblocks.com>
Message-Id: <20070610223159.35EBC5B3B@mail.bitblocks.com>
Cc: fs@freebsd.org
Subject: zfs problem
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I rebuilt and installed -current as of last night (10:30PM
PST or so).  Now both zfs & zpool croak out the following
message as they die:

    link_elf: symbol sysctl_handle_quad undefined
    internal error: failed to initialized zfs library

So I am trying to recover from losing /usr.  Trying to run
older zfs/zpool doesn't help.  Trying to compile them
statically on another system doesn't work either (libgeom and
libzfs have undefined references).  I can't even locate where
sysct_handle_quad is defined!

I suppose I can rebuild everything but it would be nice
to know what broke and if there is a work around.

Looks like zfs/zpool need to be added to /rescue.