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Bug 1436977 - [nfsd] cannot enable minor version 4.1 4.2 by default again if used to disable them by "-N 4.1 -N 4.2"
Summary: [nfsd] cannot enable minor version 4.1 4.2 by default again if used to disabl...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: nfs-utils
Version: 7.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Steve Dickson
QA Contact: Yongcheng Yang
URL:
Whiteboard:
Depends On:
Blocks: 1546181 1570066
TreeView+ depends on / blocked
 
Reported: 2017-03-29 07:36 UTC by Yongcheng Yang
Modified: 2018-10-30 11:48 UTC (History)
4 users (show)

Fixed In Version: nfs-utils-1.3.0-0.60.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1570066 (view as bug list)
Environment:
Last Closed: 2018-10-30 11:48:04 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Simple script to diable NFS version by /etc/sysconfig/nfs (504 bytes, text/plain)
2017-03-29 07:53 UTC, Yongcheng Yang 		no flags Details
another simple reproducer using rpc.nfsd (1.14 KB, text/plain)
2017-08-01 01:53 UTC, Yongcheng Yang 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:3311 0 None None None 2018-10-30 11:48:44 UTC

Description Yongcheng Yang 2017-03-29 07:36:11 UTC 
Description of problem:
Configured the "/etc/sysconfig/nfs" to not permitting NFSv4.1 or NFSv4.2, then restore them all. It turns out that NFS minor version 4.1 and 4.2 are continued to be disabled.

Version-Release number of selected component (if applicable):
nfs-utils-1.3.0-0.33.el7

How reproducible:
100% easy

Steps to Reproduce:
1. echo "RPCNFSDARGS=\"-N 4.1 -N 4.2\"" > /etc/sysconfig/nfs
2. systemctl restart nfs
3. echo "" > /etc/sysconfig/nfs
4. systemctl restart nfs
5. cat /proc/fs/nfsd/versions | grep '+4.1 +4.2'

Actual results:
-------------------------------------------------------------
# systemctl start nfs
# cat /proc/fs/nfsd/versions 
-2 +3 +4 +4.1 +4.2
# echo "RPCNFSDARGS=\"-N 4.1 -N 4.2\"" > /etc/sysconfig/nfs
# systemctl restart nfs
# cat /proc/fs/nfsd/versions 
-2 +3 +4 -4.1 -4.2  <<<<<<<<<<< 4.1/4.2 disabled as expected
# > /etc/sysconfig/nfs
# systemctl restart nfs
# cat /proc/fs/nfsd/versions 
-2 +3 +4 -4.1 -4.2  <<<<<<<<<<< cannot turn on them then
# 

Expected results:
Turn on the default NFS (minor) version as default. Even someone used to disable them before.

Additional info:
1. Specifying major NFS version ("-N 3" or "-N 4") doesn't have this problem;
2. Can reproduce this issue even with latest upstream nfs-utils version.

Method to work around:
Request that certain NFS minor versions using "-V" after that.
-------------------------------------------------------------
# cat /etc/sysconfig/nfs
# systemctl restart nfs
# cat /proc/fs/nfsd/versions 
-2 +3 +4 -4.1 -4.2
# echo "RPCNFSDARGS=\"-V 4.1 -V 4.2\"" > /etc/sysconfig/nfs
# cat /etc/sysconfig/nfs
RPCNFSDARGS="-V 4.1 -V 4.2" <<<<<<<<<<<<<<<< to workaround it
# systemctl restart nfs
# cat /proc/fs/nfsd/versions 
-2 +3 +4 +4.1 +4.2
# > /etc/sysconfig/nfs
# cat /etc/sysconfig/nfs
# systemctl restart nfs
# cat /proc/fs/nfsd/versions 
-2 +3 +4 +4.1 +4.2
#
Comment 1 Yongcheng Yang 2017-03-29 07:53:34 UTC 
Created attachment 1267245 [details]
Simple script to diable NFS version by /etc/sysconfig/nfs
Comment 3 Yongcheng Yang 2017-08-01 01:53:12 UTC 
Created attachment 1307325 [details]
another simple reproducer using rpc.nfsd
Comment 4 Yongcheng Yang 2017-08-01 01:58:40 UTC 
This issue still exists in latest rhel7. Maybe it's kernel side to fix it.

[root@test_machine ~]# ./test_rhel7.sh 
# Disabling all nfsv4
-2 +3 -4 -4.1 -4.2
# Disabling only v4.1
-2 +3 +4 -4.1 +4.2
# Disabling only v4.2
-2 +3 +4 -4.1 -4.2
# Now start it by default
-2 +3 +4 -4.1 -4.2   <<<<<<<<<<<<<<<< reproduced
# Workaround to enable v4.1 v4.2
-2 +3 +4 +4.1 +4.2
[root@test_machine ~]# uname -r
3.10.0-693.el7.x86_64
[root@test_machine ~]# rpm -q nfs-utils
nfs-utils-1.3.0-0.48.el7.x86_64
[root@test_machine ~]#
Comment 6 Steve Dickson 2018-04-25 17:49:04 UTC 
commit 1a372a7b656ddf2be21ddad70b6c64c9d1d9d161 
Author: Steve Dickson <steved>
Date:   Tue Apr 17 14:26:44 2018 -0400

    nfsd: Set default minor versions
Comment 11 errata-xmlrpc 2018-10-30 11:48:04 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3311
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