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Document that a forced dismount of an NFSv3 mount when the

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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
This commit is contained in:
Rick Macklem 2015-06-17 23:24:46 +00:00
parent 093ebe1d28
commit 1e68ee21e0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=284531
1 changed files with 4 additions and 1 deletions
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5
sbin/umount/umount.8
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@ -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.