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SubjectRe: mount.nfs: access denied by server
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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