From owner-freebsd-stable@freebsd.org  Tue Mar 13 09:47:59 2018
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From: Eugene Grosbein <eugen@grosbein.net>
Subject: GEOM strange error
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Hi!

Let's create a stripe and GPT over it using test files as backing store:

truncate -s 1G d0
truncate -s 1G d1
mdconfig -af d0		# gives md0
mdconfig -af d1		# gives md1

gpart create -s GPT md0
gpart create -s GPT md1
gpart destroy -F md1
gpart destroy -F md0	# no errors still

gstripe label -s $((128*1024)) st0 md0 md1
gpart create -s GPT /dev/stripe/st0
dmesg -a

GEOM_STRIPE: Device st0 created (id=4000112224).
GEOM_STRIPE: Disk md0 attached to st0.
GEOM_STRIPE: Disk md1 attached to st0.
GEOM_STRIPE: Device stripe/st0 activated.
GEOM: md0: corrupt or invalid GPT detected.
GEOM: md0: GPT rejected -- may not be recoverable.

Why does it emit such md0-related error?