[Bug 236504] [gmirror][UFS2] "Superblock check-hash failed" messages seen

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236504

Mark Johnston <markj at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |markj at FreeBSD.org

--- Comment #9 from Mark Johnston <markj at FreeBSD.org> ---
I don't quite understand why the test is generating these errors in the first
place.  If the checksum is failing, it means that we saw the UFS2 magic number
in the superblock, so we're probably not looking at random garbage.  Is it
possible the taste is racing with synchronization of a new gmirror disk, and
seeing a partial write of a copied superblock?

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