https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281749

--- Comment #55 from Konstantin Belousov <[email protected]> ---
(In reply to Mateusz Guzik from comment #54)
Then don't you need a residual seq-cst fence on cache lookup, between vref()
and seqc
re-read?  There is certainly some mutex unlocks that happen to be full fence on
amd64,
but only rel on more relaxed arches.

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