[Bug 232671] [gmirror] gmirror fails to recover from degraded mirror sets in some circumstances

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232671

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |In Progress
           Assignee|geom at FreeBSD.org            |cem at freebsd.org
                URL|                            |https://reviews.freebsd.org
                   |                            |/D18062

--- Comment #7 from Conrad Meyer <cem at freebsd.org> ---
This can be boiled down to the following problem:

1. sc_ndisks is 2
2. we have three eligible components:
  i. da2p5 (the stale mirror that was ejected)
  ii. da16p3 (the mirror that is partially synchronized)
  iii. da15p3 (the only good / "ACTIVE" mirror in the set)
3. STARTING auto-transitions to running based on sc_ndisks == len(sc->sc_disks)
*prior* to removing stale components.

I think the working patch in https://reviews.freebsd.org/D18062 will eliminate
(3), rejecting (i) when (ii) is added, preventing auto-start until (iii) is
tasted, or the timeout expires.

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