D44086.id135013.diff
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D44086.id135013.diff
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	Index: sys/kern/tty.c
	===================================================================
	--- sys/kern/tty.c
	+++ sys/kern/tty.c
	@@ -1314,7 +1314,8 @@
	struct xtty xtlist, xt;
	struct tty *tp;
	struct proc *p;
	- int cansee, error;
	+ int error;
	+ bool cansee;

	sx_slock(&tty_list_sx);
	lsize = tty_list_count * sizeof(struct xtty);
	@@ -1327,8 +1328,8 @@

	TAILQ_FOREACH(tp, &tty_list, t_list) {
	tty_lock(tp);
	- if (tp->t_session != NULL) {
	- p = tp->t_session->s_leader;
	+ if (tp->t_session != NULL &&
	+ (p = atomic_load_ptr(&s->s_leader)) != NULL) {
	PROC_LOCK(p);
	cansee = (p_cansee(td, p) == 0);
	PROC_UNLOCK(p);