[Bug 283103] Yet another Parallels arm64 panic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283103

--- Comment #7 from Andriy Gapon <avg@FreeBSD.org> ---
(In reply to Andrew Turner from comment #3)
I've been thinking about sleeping ithreads for another reason, sorry for
hijacking this bug report.

There could be a chip connected, e.g., via I2C.
And that chip could also be capable of generating a signal (an interrupt) via a
GPIO line.
It's not a problem to configure the GPIO interrupt but it may become a problem
if the interrupt handler needs to access the chip via a bus that requires
waiting / sleeping.

I think that at present the described setup can only work if we force the bus
to spinning / polling but that may be sub-optimal.

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