--- /etc/rc.d/ipfs	2018-10-26 12:58:34.676937000 -0700
+++ /var/tmp/ipfs	2019-02-02 15:05:31.903069000 -0800
@@ -33,6 +33,10 @@
 ipfs_start()
 {
 	if [ -r /var/db/ipf/ipstate.ipf -a -r /var/db/ipf/ipnat.ipf ]; then
+		if [ ! -f /var/db/dtrace.out ]; then
+			/usr/sbin/dtrace -o /var/db/dtrace.out -n 'sdt:::user_error { printf("%d\n", arg0); stack(); }' &
+			echo $! > /var/db/dtrace.pid
+		fi
 		${ipfs_program} -R ${rc_flags}
 		rm -f /var/db/ipf/ipstate.ipf /var/db/ipf/ipnat.ipf
 	fi
@@ -46,6 +50,9 @@
 		chown root:wheel /var/db/ipf
 	fi
 	${ipfs_program} -W ${rc_flags}
+	if [ -s /var/db/dtrace.pid ]; then
+		kill $(cat /var/db/dtrace.pid)
+	fi
 }
 
 load_rc_config $name