[Bug 291005] knote_fork() NOTE_TRACK path calls kn_fop->f_event() without knlist lock

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291005

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open
                 CC|                            |markj@FreeBSD.org

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
I think this is mostly harmless, but yes, we might as well acquire the proc
lock (i.e., knlist lock) earlier.  It only needs to be dropped while calling
kqueue_register(), everything after that can be locked.

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