[Bug 221077] Boot from ZFS fails following freebsd-update

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221077

--- Comment #19 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Steven Hartland from comment #17)
I think 'u' is a result of the code being shared between (gpt)zfsboot and
zfsloader. printf in stand/i386/boot2/boot2.c is very primitive and it simply
consumes '%j' without any output because it does not  expect 'j' (or any size
modifiers) and then just prints 'u'. It seems that that printf supports only
%c, %s and %u.

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