Public bug reported:
If you attempt to mount a share from a server that is dual stack (i.e.
has both an A and a record in DNS) and NFSv3-only, mount.nfs goes
into an infinite loop of retrying an NFS-v4 mount:
mount nfs-v3-server:/path /mnt -v
mount: no type was given - I'll assume nfs because of the colon
mount.nfs: timeout set for Tue Nov 11 14:25:34 2014
mount.nfs: trying text-based options 'vers=4,addr=x.x.x.x,clientaddr=x.x.x.x'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options
'vers=4,addr=:::,clientaddr=:::'
mount.nfs: mount(2): No route to host
mount.nfs: trying text-based options 'vers=4,addr=x.x.x.x,clientaddr=x.x.x.x'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options
'vers=4,addr=:::,clientaddr=:::'
mount.nfs: mount(2): No route to host
If we "hide" the record by setting an override in /etc/hosts, then
mount.nfs correctly retries with NFSv3:
mount -t nfs nfs-v3-server:/path /mnt -v
mount.nfs: timeout set for Tue Nov 11 15:01:35 2014
mount.nfs: trying text-based options 'vers=4,addr=x.x.x.x,clientaddr=x.x.x.x'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'addr=x.x.x.x'
mount.nfs: prog 13, trying vers=3, prot=6
mount.nfs: trying x.x.x.x prog 13 vers 3 prot TCP port 2049
mount.nfs: prog 15, trying vers=3, prot=17
mount.nfs: trying x.x.x.x prog 15 vers 3 prot UDP port 635
nfs-v3-server:/path on /mnt type nfs (rw)
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nfs-common 1:1.2.5-3ubuntu3.1
ProcVersionSignature: Ubuntu 3.2.0-70.105-generic 3.2.63
Uname: Linux 3.2.0-70-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
Date: Tue Nov 11 15:56:25 2014
InstallationMedia: Ubuntu-Server 10.04.2 LTS "Lucid Lynx" - Release amd64
(20110211.1)
MarkForUpload: True
ProcEnviron:
SHELL=/usr/bin/ksh
TERM=xterm
PATH=(custom, no user)
LANG=en_US
SourcePackage: nfs-utils
UpgradeStatus: Upgraded to precise on 2013-10-07 (400 days ago)
** Affects: nfs-utils (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
** Description changed:
If you attempt to mount a share from a server that is dual stack (i.e.
has both an A and a record in DNS) and NFSv3-only, mount.nfs goes
into an infinite loop of retrying an NFS-v4 mount:
mount nfs-v3-server:/path /mnt -v
mount: no type was given - I'll assume nfs because of the colon
mount.nfs: timeout set for Tue Nov 11 14:25:34 2014
mount.nfs: trying text-based options 'vers=4,addr=x.x.x.x,clientaddr=x.x.x.x'
mount.nfs: mount(2): Protocol not supported
- mount.nfs: trying text-based options
'vers=4,addr=2620:72:0:8c00::11,clientaddr=fe80::250:56ff:fe8b:28d7'
+ mount.nfs: trying text-based options
'vers=4,addr=:::,clientaddr=:::'
mount.nfs: mount(2): No route to host
mount.nfs: trying text-based options 'vers=4,addr=x.x.x.x,clientaddr=x.x.x.x'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options
'vers=4,addr=:::,clientaddr=:::'
- mount.nfs: mount(2): No route to host
+ mount.nfs: mount(2): No route to host
If we "hide" the record by setting an override in /etc/hosts, then
mount.nfs correctly retries with NFSv3:
mount -t nfs nfs-v3-server:/path /mnt -v
mount.nfs: timeout set for Tue Nov 11 15:01:35 2014
mount.nfs: trying text-based options 'vers=4,addr=x.x.x.x,clientaddr=x.x.x.x'
mount.nfs: mount(2): Protocol not supported
mount.nfs: trying text-based options 'addr=x.x.x.x'
mount.nfs: prog 13, trying vers=3, prot=6
- mount.nfs: trying x.x.x.x prog 13 vers 3 prot TCP port 2049
+ mount.nfs: trying x.x.x.x prog 13 vers 3 prot TCP port 2049
mount.nfs: prog 15, trying vers=3, prot=17
mount.nfs: trying x.x.x.x prog 15 vers 3 prot UDP port 635
nfs-v3-server:/path on /mnt type nfs (rw)
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nfs-common 1:1.2.5-3ubuntu3.1
ProcVersionSignature: Ubuntu 3.2.0-70.105-generic 3.2.63
Uname: Linux 3.2.0-70-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.8
Architecture: amd64
Date: Tue Nov 11 15:56:25 2014
InstallationMedia: Ubuntu-Server 10.04.2 LTS "Lucid Lynx" - Release amd64
(20110211.1)
MarkForUpload: True
ProcEnviron:
- SHELL=/usr/bin/ksh
- TERM=xterm
- PATH=(custom, no user)
- LANG=en_US
+ SHELL=/usr/bin/ksh
+ TERM=xterm
+ PATH=(custom, no user)
+ LANG=en_US
SourcePackage: nfs-utils
UpgradeStatus: Upgraded to precise on 2013-10-07 (400 days ago)
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1391662
Title:
mount.nfs does not downgrade NFS version when connecting to dual-stack
NFS server
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1391662/+subscription
