Re: NFSv4 mount fails on Sun Solaris 10 after reboot of client

[Ulrich Gemkow <ulrich.gemkow@ikr.uni-stuttgart.de>]

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Hello Bruce,

On Monday 24 August 2015 22:14:01 J. Bruce Fields wrote:
> On Mon, Aug 24, 2015 at 02:52:55PM +0200, Ulrich Gemkow wrote:
> > we have a weired problem with Linux NFSv4.0 Server (Vanilla
> > Kernel 4.1.6) and a Sun Solaris 10 client (all patches applied):
> > 
> > When mounting a share on the Solaris client and then rebooting
> > the client without unmounting the share first, after the reboot
> > every attempt to mount the share again gives an I/O error on
> > the client and the mount fails.
> > 
> > After a long time (serveral hours) the v4 mount suddenly works
> > again.
> > 
> > Mounting a share with vers=2 works always even in times when
> > the v4 mount fails.
> > 
> > So it seems the Linux NFSv4 server holds a state for the client
> > which prevents the re-mounting of the share and gives the
> > I/O-error on the client.
> > 
> > We use NFSv4 without idmapd.
> > 
> > Is there any tip how to debug or solve this?
> 
> Best is probably to get a packet trace.  So something like:
> 
> 	tcpdump -s0 -iem0 -wtmp.pcap
> 
> and then try the client mount, then kill the tcpdump after the mount
> fails, and send us tmp.pcap.  (And/or take a look at tmp.pcap yourself
> with wireshark.  The interesting question is what kind of error the
> server is returning when the client tries the mount after reboot.)

Thank you for your reply. The tcpdump is attached, the relevant
packets are 49..52. The error seems to be a SERVERFAULT. Can you
see more from the dump?

Thanks again and best regards

Ulrich

> --b.
> 
> > 
> > Thank you and best regards
> > 
> > -Ulrich

> > |-----------------------------------------------------------------------
> > | Ulrich Gemkow
> > | University of Stuttgart, Germany
> > | Institute of Communication Networks and Computer Engineering (IKR)
> > |-----------------------------------------------------------------------

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