From e10037df2c438d4975ff0f24df9b3ad4edc464f0 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 7 Oct 2016 13:43:38 +0000
Subject: [PATCH] Add verbosity around failed reboot(2) call.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
---
 sbin/init/init.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sbin/init/init.c b/sbin/init/init.c
index 24785fe827a3..25ac2bd63901 100644
--- a/sbin/init/init.c
+++ b/sbin/init/init.c
@@ -885,8 +885,13 @@ single_user(void)
 	if (Reboot) {
 		/* Instead of going single user, let's reboot the machine */
 		sync();
-		reboot(howto);
-		_exit(0);
+		if (reboot(howto) == -1) {
+			emergency("reboot(%#x) failed, %s", howto,
+			    strerror(errno));
+			_exit(1); /* panic and reboot */
+		}
+		warning("reboot(%#x) returned", howto);
+		_exit(0); /* panic as well */
 	}
 
 	shell = get_shell();