commit 0fee6bb1087df552cd10052e1e7c15c3073826fc
Author: Ed Maste <emaste@freebsd.org>
Date:   Wed Jul 5 14:27:49 2017 -0400

    Increase stack guard to 16 pages for testing

diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
index 0a99ddde486f..a26783646bad 100644
--- a/sys/vm/vm_map.c
+++ b/sys/vm/vm_map.c
@@ -3586,7 +3586,7 @@ out:
 	return (rv);
 }
 
-static int stack_guard_page = 1;
+static int stack_guard_page = 16;
 SYSCTL_INT(_security_bsd, OID_AUTO, stack_guard_page, CTLFLAG_RWTUN,
     &stack_guard_page, 0,
     "Specifies the number of guard pages for a stack that grows");