[Bug 230246] GPT label mishandling

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230246

--- Comment #3 from Mason Loring Bliss <mason at blisses.org> ---
Persists on 12. Typical encounter for me is a server that was running FreeBSD
and
subsequently moved to GNU/Linux. Redeploying FreeBSD, evidently spoor from the
old install remains, and when I kldload geom_mirror, a degraded mirror is
raised
from the dead. Evidently there's some sort of in-memory corruption after this
as removing the remnants gives me assertion errors, and I'm not able to proceed
until I clear memory with a reboot.

I haven't read or traced the code yet, but at a guess something's seeing enough
indication of the old mirror to assume there's a mirror component there, and
then trusting that additional on-disk data is valid when it's not. This would
be pretty consistent with an assertion firing.

If life permits, I'll learn enough to track down just what's happening.

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