kib 7beefda00b sys.kern.pdeathsig.signal_delivered_ptrace: fix startup.
Inform D that C executed procctl(PROC_PDEATHSIG_CTL).  Otherwise D
might allow B to exit before C is set up to receive a signal on the
parent exit.  In this case, C waits forever for the signal and test
hangs.

PR:	237657
Reported and tested by:	lwhsu
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-08-19 09:33:09 +00:00
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