[Bug 229106] intr_event_handle is unsafe with respect to interrupt handler list

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

Conrad Meyer <cem at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |cem at freebsd.org

--- Comment #3 from Conrad Meyer <cem at freebsd.org> ---
Just FYI for next time, if you're making code changes, fail_point(9) can make
this kind of scenario much easier to hit.  In particular, you can expand races
by adding in an empty KFAIL_POINT_CODE() and then inducing a delay with sysctl
my.failpoint="50%delay(1000)" (i.e., DELAY(1000) 50% of times we hit that
failpoint; the 50% can help avoid excessive foot-shooting).

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