[Bug 204633] If INVARIANTS is enabled, free() may attempt to acquire sleeping lock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204633

--- Comment #3 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Jonathan T. Looney from comment #2)
I think it would be correct and reasonable to assert that
curthread->td_critnest == 0 at the beginning of uma_zalloc_arg() and
uma_zfree_arg(). In most cases, UMA can satisfy allocation and free requests
without acquiring a lock, so the checking currently done by witness is not
consistent.

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