D59126.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
	@@ -1892,7 +1892,12 @@
	/* XXX: This looks awful. */
	tty_unlock(tp);
	sx_xlock(&proctree_lock);
	- tty_lock(tp);
	+ error = ttydev_enter(tp);
	+ if (error != 0) {
	+ sx_xunlock(&proctree_lock);
	+ tty_lock(tp);
	+ return (error);
	+ }

	if (!SESS_LEADER(p)) {
	/* Only the session leader may do this. */
	@@ -1959,7 +1964,12 @@
	pg != NULL ? pg->pg_id : -1,
	td->td_proc->p_session->s_sid));
	}
	- tty_lock(tp);
	+ error = ttydev_enter(tp);
	+ if (error != 0) {
	+ sx_sunlock(&proctree_lock);
	+ tty_lock(tp);
	+ return (error);
	+ }

	/*
	* Determine if this TTY is the controlling TTY after