Bug 804218

Summary:	Cannot unmount NFS share if Mount version 2 is disabled.
Product:	Red Hat Enterprise Linux 6	Reporter:	Orion Poplawski <orion>
Component:	nfs-utils	Assignee:	Steve Dickson <steved>
Status:	CLOSED NOTABUG	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.2	CC:	jlayton, orion, sprabhu
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	595675
Clones:	804681 (view as bug list)		Environment:
Last Closed:	2012-03-19 15:12:03 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	595675
Bug Blocks:	804681

Description Orion Poplawski 2012-03-16 21:27:40 UTC

Hopefully cloning this is useful.  On EL6 you cannot disable just version 1, but you can disable version 2 (which also disables version 1).  If you do, you get the same problem as before with EL5 and version 1.

+++ This bug was initially created as a clone of Bug #595675 +++

Reproducer:

On server:
edit /etc/sysconfig/nfs and set  MOUNTD_NFS_V2=no
restart nfs

On client: 
Mount a share from the server. This should be successful.
Now try to unmount it. This fails with an error.

# umount /mnt
umount.nfs: vm22:/exports: not found / mounted or server not reachable
umount.nfs: vm22:/exports: not found / mounted or server not reachable


The cause appears to be the fact that the client when mounting uses MOUNT version 3 protocol. However when unmounting, it appears to use version 1 of the MOUNT protocol. Since version 1 is disabled, the client cannot unmount.

--- Additional comment from steved on 2011-01-21 13:47:14 EST ---

Created attachment 474657 [details]
The patch that fixes the problem

--- Additional comment from errata-xmlrpc on 2011-07-21 07:35:22 EDT ---

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2011-1048.html

Comment 2 Orion Poplawski 2012-03-16 21:34:02 UTC

Oops, maybe this is just still an issue with EL5 clients and version 2 being disabled on the server.  Just tested with EL6 client and was able to unmount.

Comment 3 Orion Poplawski 2012-03-16 21:44:03 UTC

nfs-utils-1.0.9-60.el5

Comment 4 Steve Dickson 2012-03-19 12:01:09 UTC

(In reply to comment #2)
> Oops, maybe this is just still an issue with EL5 clients and version 2 being
> disabled on the server.  Just tested with EL6 client and was able to unmount.
A bit confused... Can close this bz or is there still a problem with RHEL6 (or even RHEL5)?

Comment 5 Orion Poplawski 2012-03-19 14:47:09 UTC

Sorry about that.  There does not appear to be a problem with RHEL6, but there is with RHEL5 client - can't unmount if the server has disabled version 2.  So this either needs to get reassign back to RHEL5 or closed if we can't do that.

Comment 6 Steve Dickson 2012-03-19 15:12:03 UTC

I just opened this clone:
   https://bugzilla.redhat.com/show_bug.cgi?id=804681