svn commit: r250162 - head/usr.sbin/nfsd
Rick Macklem
rmacklem at FreeBSD.org
Wed May 1 22:50:46 UTC 2013
Author: rmacklem
Date: Wed May 1 22:50:45 2013
New Revision: 250162
URL: http://svnweb.freebsd.org/changeset/base/250162
Log:
Document the fact that an NFSv4 mount against a volume on the same host
can result in a hung NFS server and is not recommended.
This is a content change.
MFC after: 2 weeks
Modified:
head/usr.sbin/nfsd/nfsv4.4
Modified: head/usr.sbin/nfsd/nfsv4.4
==============================================================================
--- head/usr.sbin/nfsd/nfsv4.4 Wed May 1 22:47:47 2013 (r250161)
+++ head/usr.sbin/nfsd/nfsv4.4 Wed May 1 22:50:45 2013 (r250162)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd December 23, 2012
+.Dd May 1, 2013
.Dt NFSV4 4
.Os
.Sh NAME
@@ -287,6 +287,13 @@ and
daemons at boot time via the ``nfsuserd_flags'' and ``nfscbd_flags''
.Xr rc.conf 5
variables.
+.Pp
+NFSv4 mount(s) against exported volume(s) on the same host are not recommended,
+since this can result in a hung NFS server.
+It occurs when an nfsd thread tries to do an NFSv4 VOP_RECLAIM()/Close RPC
+as part of acquiring a new vnode.
+If all other nfsd threads are blocked waiting for lock(s) held by this nfsd
+thread, then there isn't an nfsd thread to service the Close RPC.
.Sh FILES
.Bl -tag -width /var/db/nfs-stablerestart.bak -compact
.It Pa /var/db/nfs-stablerestart
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