Re: [pnfs] nfs41_sequence_done

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On Mon, 2010-07-12 at 22:16 +0300, Benny Halevy wrote:
> On Jul. 12, 2010, 22:14 +0300, Trond Myklebust <Trond.Myklebust@xxxxxxxxxx> wrote:
> > On Mon, 2010-07-12 at 21:58 +0300, Benny Halevy wrote:
> >> [pnfs@xxxxxxxxxxxxx -> linux-nfs@xxxxxxxxxxxxxxx]
> >>
> >> On Jul. 12, 2010, 21:29 +0300, Jim Rees <rees@xxxxxxxxx> wrote:
> >>> Does anyone still care about this?
> >>>
> >>>  WARNING: nfs41_sequence_done: Operation in progress slot=1 seq=7 highest_used_slotid=1: please report to pnfs@xxxxxxxxxxxxx if you saw this message
> >>
> >> Heh, need to update hard-coded instructions to point to the new list...
> >>
> >>>
> >>> I'm getting this on the client side of a pnfs block layout mount against the
> >>> spnfs server.  Kernel is benny's pnfs-all-2.6.35-rc3-2010-07-01 plus EMC
> >>> complex block layout patches.  It's possible the complex layout code is to
> >>> blame, but I doubt it because this isn't a complex layout mount.  I can
> >>> provide more details.
> >>
> >> I agree.  This is a generic issue.
> >> The patch that  adds this check is
> >> d6ce9ad DEVONLY: nfs41: Do not free slot if retried while operation was in progress
> >>
> >> It was originally rejected (http://www.spinics.net/lists/linux-nfs/msg09562.html)
> >> due to noise regarding where nfs41_sequence_free_slot is called
> >> but that masked the real issue.
> >>
> >> Can you readily reproduce this?
> >> Can you debug also the server side to see if indeed the client retries the RPC
> >> while it is in progress on the server?
> > 
> > So what is the root cause here? Is it the known issue that we don't deal
> > correctly with an NFS4ERR_DELAY on the SEQUENCE operation?
> 
> Yes.

I'm happy to take patches to fix that.

Trond
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