[Bug 271989] zfs root mount error 6 after upgrade from 11.1-release to 13.2-release

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271989

--- Comment #7 from Markus Wild <freebsd-bugs@virtualtec.ch> ---
(In reply to Dan Langille from comment #5)
Check whether you have "ghost" zfs labels on your main drives, besides
the expected ones in the zfs partitions:

zdb -l /dev/ada0
zdb -l /dev/ada1

if yours is the same problem as mine was, you'll find the last two of 
the 4 labels valid, and the kernel will then happily use this wrong label
(it will plain ignore the partitions) just to fail to mount the pool later.
I see no good reason to upgrade the root pool in such a situation, besides
making a fallback to the working system impossible.

Cheers,
Markus

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