[Bug 251915] TOCTOU race between tty_signal_sessleader() and killjobc()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251915

--- Comment #3 from Konstantin Belousov <kib at FreeBSD.org> ---
(In reply to Jakub Piecuch from comment #2)
One of the fundamental assumptions of the FreeBSD kernel code is that plain
stores and loads of fundamental types (integers up to long and pointers) are
atomic on supported arches.  This is explained in the very beginning of
atomic(9).

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