[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 #6 from Jakub Piecuch <j.piecuch96 at gmail.com> ---
(In reply to Konstantin Belousov from comment #5)
I mention t_session in the comment because it contains the mutex that we should
be holding in order to access t_session->s_leader. proctree_lock would also
suffice for reading, but we're not holding that lock either. 

Thanks for reviewing and improving my patch. I'm a kernel newbie, so all
feedback is appreciated :-)

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