[Bug 204298] xpt_release_device() panic: mutex CAM queue lock not owned

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204298

--- Comment #4 from Scott Long <scottl at FreeBSD.org> ---
The bus/topology locks for device reference counting exist only because RCU
wasn't available when I did the locking work.  I'd really prefer that they went
away soon.  Would someone be willing to investigate ck_epoch from
ConcurrencyKit?  We're going to import this library into FreeBSD soon, and
ck_epoch provides lockless object lifecycle semantics.

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