From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andreas Klauer <Andreas.Klauer@metamorpher.de>
Subject: Re: mdadm stuck at 0% reshape after grow
Date: Wed, 6 Dec 2017 11:49:05 +0100
Message-ID: <20171206104905.GA4383@metamorpher.de>
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To: Jeremy Graham <jeremy@doghouse.agency>
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On Wed, Dec 06, 2017 at 03:33:36PM +1100, Jeremy Graham wrote:
> How do I "manually regenerate content for each block in BBL's and then
> manually zero the lists in superblocks"? This is uncharted (and
> slightly scary) territory for me.

You don't. Just mdadm --assemble it with --update=force-no-bbl here.

If you have a filesystem with bad blocks management on top of it, 
check that too and clear it if necessary.

Regards
Andreas Klauer