From mboxrd@z Thu Jan  1 00:00:00 1970
From: Curt <lightspd@gmail.com>
Subject: Re: hung grow
Date: Tue, 10 Oct 2017 15:51:02 -0400
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> I tried a mount, it just sits there.  No errors, which I'm not sure if
> that's good or bad, so it's almost like it's just waiting for the
> device to not be busy.  I noticed it was lists both a reshape and
> spare rebuild.  Could it be it's trying to rebuild the spare and
> getting in some kind of dead lock?

Follow up, here's the top process, does this look right to you?
9771 root      20   0       0      0      0 R 100.0  0.0  38:27.01 md127_raid6