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mount.nfs: access denied by server

 

 

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fengguang.wu at intel

Aug 20, 2009, 12:13 AM

Post #1 of 6 (1692 views)
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mount.nfs: access denied by server

Hi,

After upgrading NFS client kernel to latest linux-next, NFS mount
failed:

# mount -t nfs pxe:/cc /cc
mount.nfs: access denied by server while mounting pxe:/cc

# uname -a
Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20 14:46:10 CST 2009 x86_64 GNU/Linux

However server log says OK:

Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount request from 192.168.11.6:973 for /cc (/cc)
Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount request from 192.168.11.6:974 for /cc (/cc)

However-2: nfsroot can be mounted at boot time. Server kernel has always been 2.6.30.

Any ideas?

Thanks,
Fengguang
Attachments: .config (55.6 KB)


trond.myklebust at fys

Aug 20, 2009, 6:02 AM

Post #2 of 6 (1635 views)
Permalink
Re: mount.nfs: access denied by server [In reply to]

On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote:
> Hi,
>
> After upgrading NFS client kernel to latest linux-next, NFS mount
> failed:
>
> # mount -t nfs pxe:/cc /cc
> mount.nfs: access denied by server while mounting pxe:/cc
>
> # uname -a
> Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20 14:46:10 CST 2009 x86_64 GNU/Linux
>
> However server log says OK:
>
> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount request from 192.168.11.6:973 for /cc (/cc)
> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount request from 192.168.11.6:974 for /cc (/cc)
>
> However-2: nfsroot can be mounted at boot time. Server kernel has always been 2.6.30.
>
> Any ideas?
>
> Thanks,
> Fengguang

Can you try again after enabling mount debugging on the NFS client?

echo 512 > /proc/sys/sunrpc/nfs_debug


Cheers
Trond

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fengguang.wu at intel

Aug 20, 2009, 6:27 PM

Post #3 of 6 (1636 views)
Permalink
Re: mount.nfs: access denied by server [In reply to]

On Thu, Aug 20, 2009 at 09:02:29PM +0800, Trond Myklebust wrote:
> On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote:
> > Hi,
> >
> > After upgrading NFS client kernel to latest linux-next, NFS mount
> > failed:
> >
> > # mount -t nfs pxe:/cc /cc
> > mount.nfs: access denied by server while mounting pxe:/cc
> >
> > # uname -a
> > Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20 14:46:10 CST 2009 x86_64 GNU/Linux
> >
> > However server log says OK:
> >
> > Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount request from 192.168.11.6:973 for /cc (/cc)
> > Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount request from 192.168.11.6:974 for /cc (/cc)
> >
> > However-2: nfsroot can be mounted at boot time. Server kernel has always been 2.6.30.
> >
> > Any ideas?
> >
> > Thanks,
> > Fengguang
>
> Can you try again after enabling mount debugging on the NFS client?
>
> echo 512 > /proc/sys/sunrpc/nfs_debug

I used 1024 and found the mount failed here in nfs_walk_authlist():

dfprintk(MOUNT, "NFS: server does not support requested auth flavor\ n");
nfs_umount(request);

Thanks,
Fengguang
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trond.myklebust at fys

Aug 20, 2009, 7:36 PM

Post #4 of 6 (1628 views)
Permalink
Re: mount.nfs: access denied by server [In reply to]

On Fri, 2009-08-21 at 09:27 +0800, Wu Fengguang wrote:
> On Thu, Aug 20, 2009 at 09:02:29PM +0800, Trond Myklebust wrote:
> > On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote:
> > > Hi,
> > >
> > > After upgrading NFS client kernel to latest linux-next, NFS mount
> > > failed:
> > >
> > > # mount -t nfs pxe:/cc /cc
> > > mount.nfs: access denied by server while mounting pxe:/cc
> > >
> > > # uname -a
> > > Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20 14:46:10 CST 2009 x86_64 GNU/Linux
> > >
> > > However server log says OK:
> > >
> > > Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount request from 192.168.11.6:973 for /cc (/cc)
> > > Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount request from 192.168.11.6:974 for /cc (/cc)
> > >
> > > However-2: nfsroot can be mounted at boot time. Server kernel has always been 2.6.30.
> > >
> > > Any ideas?
> > >
> > > Thanks,
> > > Fengguang
> >
> > Can you try again after enabling mount debugging on the NFS client?
> >
> > echo 512 > /proc/sys/sunrpc/nfs_debug
>
> I used 1024 and found the mount failed here in nfs_walk_authlist():
>
> dfprintk(MOUNT, "NFS: server does not support requested auth flavor\ n");
> nfs_umount(request);

Thanks Fengguang!

Chuck, this looks like one of yours. Could it be that you are hitting
the same Linux knfsd bug that Tom Haynes saw with a Solaris client?
AFAICR, the problem was that existing nfs servers do not set a default
auth flavour, and so you just have to try with auth_sys and see if it
succeeds...

Cheers
Trond

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Chuck.Lever at oracle

Aug 21, 2009, 10:50 AM

Post #5 of 6 (1632 views)
Permalink
Re: mount.nfs: access denied by server [In reply to]

On Aug 20, 2009, at 10:36 PM, Trond Myklebust wrote:

> On Fri, 2009-08-21 at 09:27 +0800, Wu Fengguang wrote:
>> On Thu, Aug 20, 2009 at 09:02:29PM +0800, Trond Myklebust wrote:
>>> On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote:
>>>> Hi,
>>>>
>>>> After upgrading NFS client kernel to latest linux-next, NFS mount
>>>> failed:
>>>>
>>>> # mount -t nfs pxe:/cc /cc
>>>> mount.nfs: access denied by server while mounting pxe:/cc
>>>>
>>>> # uname -a
>>>> Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20
>>>> 14:46:10 CST 2009 x86_64 GNU/Linux
>>>>
>>>> However server log says OK:
>>>>
>>>> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount
>>>> request from 192.168.11.6:973 for /cc (/cc)
>>>> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount
>>>> request from 192.168.11.6:974 for /cc (/cc)
>>>>
>>>> However-2: nfsroot can be mounted at boot time. Server kernel has
>>>> always been 2.6.30.
>>>>
>>>> Any ideas?
>>>>
>>>> Thanks,
>>>> Fengguang
>>>
>>> Can you try again after enabling mount debugging on the NFS client?
>>>
>>> echo 512 > /proc/sys/sunrpc/nfs_debug
>>
>> I used 1024 and found the mount failed here in nfs_walk_authlist():
>>
>> dfprintk(MOUNT, "NFS: server does not support requested auth
>> flavor\ n");
>> nfs_umount(request);
>
> Thanks Fengguang!
>
> Chuck, this looks like one of yours. Could it be that you are hitting
> the same Linux knfsd bug that Tom Haynes saw with a Solaris client?
> AFAICR, the problem was that existing nfs servers do not set a default
> auth flavour, and so you just have to try with auth_sys and see if it
> succeeds...

With 1024 set, the mount client's XDR routines should have listed the
server's flavors, if any, in the system log. Should be something like
"NFS: received 0 auth flavors" if the server didn't return any. Can
you confirm that?

I'll try to post a fix later today.

--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com



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fengguang.wu at intel

Aug 21, 2009, 6:48 PM

Post #6 of 6 (1622 views)
Permalink
Re: mount.nfs: access denied by server [In reply to]

On Sat, Aug 22, 2009 at 01:50:52AM +0800, Chuck Lever wrote:
>
> On Aug 20, 2009, at 10:36 PM, Trond Myklebust wrote:
>
> > On Fri, 2009-08-21 at 09:27 +0800, Wu Fengguang wrote:
> >> On Thu, Aug 20, 2009 at 09:02:29PM +0800, Trond Myklebust wrote:
> >>> On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote:
> >>>> Hi,
> >>>>
> >>>> After upgrading NFS client kernel to latest linux-next, NFS mount
> >>>> failed:
> >>>>
> >>>> # mount -t nfs pxe:/cc /cc
> >>>> mount.nfs: access denied by server while mounting pxe:/cc
> >>>>
> >>>> # uname -a
> >>>> Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20
> >>>> 14:46:10 CST 2009 x86_64 GNU/Linux
> >>>>
> >>>> However server log says OK:
> >>>>
> >>>> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount
> >>>> request from 192.168.11.6:973 for /cc (/cc)
> >>>> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount
> >>>> request from 192.168.11.6:974 for /cc (/cc)
> >>>>
> >>>> However-2: nfsroot can be mounted at boot time. Server kernel has
> >>>> always been 2.6.30.
> >>>>
> >>>> Any ideas?
> >>>>
> >>>> Thanks,
> >>>> Fengguang
> >>>
> >>> Can you try again after enabling mount debugging on the NFS client?
> >>>
> >>> echo 512 > /proc/sys/sunrpc/nfs_debug
> >>
> >> I used 1024 and found the mount failed here in nfs_walk_authlist():
> >>
> >> dfprintk(MOUNT, "NFS: server does not support requested auth
> >> flavor\ n");
> >> nfs_umount(request);
> >
> > Thanks Fengguang!
> >
> > Chuck, this looks like one of yours. Could it be that you are hitting
> > the same Linux knfsd bug that Tom Haynes saw with a Solaris client?
> > AFAICR, the problem was that existing nfs servers do not set a default
> > auth flavour, and so you just have to try with auth_sys and see if it
> > succeeds...
>
> With 1024 set, the mount client's XDR routines should have listed the
> server's flavors, if any, in the system log. Should be something like
> "NFS: received 0 auth flavors" if the server didn't return any. Can
> you confirm that?

Yes. The full logs are:


Aug 21 09:54:38 hp kernel: [ 74.671552] NFS: nfs mount opts='nolock,addr=192.168.11.2'
Aug 21 09:54:38 hp kernel: [ 74.677150] NFS: parsing nfs mount option 'nolock'
Aug 21 09:54:38 hp kernel: [ 74.682204] NFS: parsing nfs mount option 'addr=192.168.11.2'
Aug 21 09:54:38 hp kernel: [ 74.688234] NFS: MNTPATH: '/cc'
Aug 21 09:54:38 hp kernel: [ 74.691468] NFS: sending MNT request for pxe:/cc
Aug 21 09:54:38 hp kernel: [ 74.704458] NFS: received 0 auth flavors
Aug 21 09:54:38 hp kernel: [ 74.708587] NFS: MNT request succeeded
Aug 21 09:54:38 hp kernel: [ 74.712435] NFS: server does not support requested auth flavor
Aug 21 09:54:38 hp kernel: [ 74.718358] NFS: sending UMNT request for pxe:/cc


> I'll try to post a fix later today.

Thanks!

Fengguang
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