Bug 802048

Summary: NFS4: umount not possible if // is part of the address
Product: Red Hat Enterprise Linux 6 Reporter: David Rotermund <davrotrh>
Component: nfs-utilsAssignee: Steve Dickson <steved>
Status: CLOSED CURRENTRELEASE QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: low Docs Contact:
Priority: unspecified    
Version: 6.2   
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: nfs-utils-1.2.3-20.el6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-10-12 13:35:42 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:

Description David Rotermund 2012-03-10 14:45:37 UTC 
Description of problem:

I ran into the following problem using SL6.2: 

If I mount a NFS4 dir like this
#cat /etc/fstab
[...]
10.10.70.9://raid_0 /9 nfs

then this results in 
#cat /etc/mtab 
[...]
10.10.70.9://raid_0 /9 nfs rw,vers=4,addr=10.10.70.9,clientaddr=10.10.70.43 0 0

and this 

#cat /proc/mounts
[...]
10.10.70.9:/raid_0/ /9 nfs4
rw,relatime,vers=4,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,por
t=0,timeo=600,retrans=2,sec=sys,clientaddr=10.10.70.43,minorversion=0,local_
lock=none,addr=10.10.70.9 0 0

Due to the different handling of the // for NFS4, I cannot unmount the directory again. If I try then I get the error 
#umount /9
/9 was not found in /proc/mounts
/9 was not found in /proc/mounts

This problem doesn't occur with NFS3 shares because the corresponding /proc/mounts entry still contains //. 

My workaround is to remove // from the /etc/fstab and change /etc/mtab on all running systems by hand.
Comment 2 RHEL Program Management 2012-05-03 05:15:01 UTC 
Since RHEL 6.3 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.