https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229106

--- Comment #1 from John Baldwin <j...@freebsd.org> ---
This is an old race.  I have a very old p4 branch that dedicates a spin lock to
protecting the list of handlers (and then uses that as the thread_lock of idle
interrupt threads so that the number of spin locks taken for an interrupt
remains the same) that fixes this.

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