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Size of the per-process semaphore undo structure (semusz) depends on the number of the per-process undos. If kern.ipc.semume is adjusted, semusz must be adjusted as well, and it makes no sense to delegate adjustment to user. Make it automatic. Reported and tested by: Olef <o.vandestadt@gmail.com> PR: 250361 Reviewed by: jhb, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D26826