Permission denied problem

[Avishay Traeger]

On Thu, 2007-06-14 at 16:52 -0400, J. Bruce Fields wrote:
> On Thu, Jun 14, 2007 at 04:43:03PM -0400, Avishay Traeger wrote:
> > I came across the following error while running a random read benchmark
> > using krb5p.  I had 6 client machines, each running 4 processes.  Each
> > process was reading from its own 1GB file that was in its own directory.
> > During the run, one of the reads failed, and perror() printed
> > "Permission denied".  This was pretty strange, since the benchmark had
> > been running for some time.
> > 
> > Then:
> > $ umount /n/test
> > (this succeeded with no problem)
> > $ ls /n/test 
> > ls: /n/test: Permission denied
> > $ ll /n/
> > ?--------- ? ?        ?       ?            ? /n/test
> > $ umount /n/test
> > umount: /n/test: device is busy
> > 
> > Running the 'mount' command does not show the NFSv4 mount.  However, if
> > I cat /proc/mounts:
> > v4server:/ /n/test nfs4 rw,vers=4,rsize=131072,wsize=131072,hard,intr,
> > proto=tcp,timeo=600,retrans=3,sec=krb5p,addr=v4server 0 0
> > 
> > This does not happen every time I run the benchmark, but I have seen it
> > three times.  Let me know if you need any more information.
> 
> What kernel version was this?

Kernel version 2.6.22-rc3, NFS utils version 1.1.0-rc1.

> --b.

Avishay