>>> It may be because it is blocked in kernel.
>>> Can you do something like this:
>>> echo "0t<pid of zpool import>::pid2proc|::walk thread|::findstack -v"
>
> So we see that it cannot complete import here and is waiting for
> transaction group to sync. So probably spa_sync thread is stuck, and we
> need to find out why.

Well, the details are going to change, I had to reboot.  :-(

I'll start up the stuck thread bug again here by simply starting over.
I'll bet you would be able to learn a few things if you were to ssh into
this machine. ?

regardless, let's start over.

dcla...@neptune:~$ uname -a
SunOS neptune 5.11 snv_111 i86pc i386 i86pc
dcla...@neptune:~$ uptime
  2:04pm  up 10:13,  1 user,  load average: 0.17, 0.16, 0.15
dcla...@neptune:~$ su -
Password:
Sun Microsystems Inc.   SunOS 5.11      snv_111 November 2008
#
# zpool import
  pool: foo
    id: 15989070886807735056
 state: ONLINE
status: The pool was last accessed by another system.
action: The pool can be imported using its name or numeric identifier and
        the '-f' flag.
   see: http://www.sun.com/msg/ZFS-8000-EY
config:

        foo         ONLINE
          c0d0p0    ONLINE
#

please see ALL the details at :

http://www.blastwave.org/dclarke/blog/files/kernel_thread_stuck.README

also see output from fmdump -eV

http://www.blastwave.org/dclarke/blog/files/fmdump_e.log

Please let me know what else you may need.

-- 
Dennis Clarke

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