[Bug 293382] Dead lock and kernel crash around closefp_impl

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293382

Mark Johnston <markj@FreeBSD.org> changed:

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                 CC|                            |kib@FreeBSD.org

--- Comment #11 from Mark Johnston <markj@FreeBSD.org> ---
https://reviews.freebsd.org/D55852 might fix this.  I see a race which I think
can cause these assertion failures, but I think it would be triggered by
different userspace threads simultaneously registering an fd with a kqueue
while closing the fd, which is presumably an application bug.

Note, I haven't tested the patch yet, so please don't try it unless you can
recover from a broken kernel.

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