D44086.diff
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	diff --git a/sys/kern/tty.c b/sys/kern/tty.c
	--- a/sys/kern/tty.c
	+++ b/sys/kern/tty.c
	@@ -1315,7 +1315,8 @@
	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);
	@@ -1328,8 +1329,8 @@

	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(&tp->t_session->s_leader)) != NULL) {
	PROC_LOCK(p);
	cansee = (p_cansee(td, p) == 0);
	PROC_UNLOCK(p);