From be596a353536ab64bc861846a598172257a2b89d Mon Sep 17 00:00:00 2001
From: rmacklem <rmacklem@FreeBSD.org>
Date: Wed, 17 Jun 2015 23:24:46 +0000
Subject: Document that a forced dismount of an NFSv3 mount when the NLM
 (rpc.lockd) is running can crash the system. Unfortunately this is not easy
 to fix, but I have left PR#200585 open.

PR:		200585
MFC after:	3 days
---
 sbin/umount/umount.8 | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'sbin')

diff --git a/sbin/umount/umount.8 b/sbin/umount/umount.8
index e62bcc5..2ddbf5a 100644
--- a/sbin/umount/umount.8
+++ b/sbin/umount/umount.8
@@ -28,7 +28,7 @@
 .\"     @(#)umount.8	8.2 (Berkeley) 5/8/95
 .\" $FreeBSD$
 .\"
-.Dd November 22, 2014
+.Dd June 17, 2015
 .Dt UMOUNT 8
 .Os
 .Sh NAME
@@ -81,6 +81,9 @@ The root file system cannot be forcibly unmounted.
 For NFS, a forced dismount can take up to 1 minute or more to
 complete against an unresponsive server and may throw away
 data not yet written to the server for this case.
+Also, doing a forced dismount of an NFSv3 mount when
+.Xr rpc.lockd 8
+is running is unsafe and can result in a crash.
 .It Fl h Ar host
 Only file systems mounted from the specified host will be
 unmounted.
-- 
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