[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 #3 from Alexander Motin <mav at FreeBSD.org> ---
I like your idea of giving timeout a reference. I've even reworked your patch
in IMO cleaner way (see new attachment). Unfortunately after doing that I hit
the problem affecting both mine and your patches: device reference counters are
protected by bus lock, that can not be acquired while holding device queue
lock. I am not ready to say this approach is hopeless, but requires some more
thinking.

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