Date: Wed, 17 Jun 2015 23:24:47 +0000 (UTC) From: Rick Macklem <rmacklem@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r284531 - head/sbin/umount Message-ID: <201506172324.t5HNOlMD000301@svn.freebsd.org>
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Author: rmacklem Date: Wed Jun 17 23:24:46 2015 New Revision: 284531 URL: https://svnweb.freebsd.org/changeset/base/284531 Log: 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 Modified: head/sbin/umount/umount.8 Modified: head/sbin/umount/umount.8 ============================================================================== --- head/sbin/umount/umount.8 Wed Jun 17 22:52:12 2015 (r284530) +++ head/sbin/umount/umount.8 Wed Jun 17 23:24:46 2015 (r284531) @@ -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 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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