[Bug 223745] PROC_REAP_KILL misses descendants if another process has become a reaper in between

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223745

--- Comment #1 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Michael Zuo from comment #0)
Perhaps yes, this might be a reasonable mode of operation.  I am interested on
the bapt@ opinion whether the current mode is useless or should be preserved.

That said, implementing the descent into the descendants of the subordinate
reapers is somewhat clumsy, most likely proctree lock would need to be taken
exclusive to allow marking the processes for tree traversal.

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