Re: [PATCH] nfsd: deal with DELEGRETURN racing with CB_RECALL

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On Tue, Sep 01, 2015 at 10:48:27AM -0400, Andrew W Elble wrote:
> 
> I should probably state what I'm currently chasing:
> 
> 1.) Somehow, delegations wind up on the cl_revoked list at the server.
> 2.) The server continually asserts SEQ4_STATUS_RECALLABLE_STATE_REVOKED.
> 3.) The client for some reason doesn't have anything to give the server
>     to satisfy it.
> 
> I speculate that this patch will assist in making this go away - I'm
> just not 100% sure of all the conditions that result in making #1 possible.
> (Enough recalls backed up on the callback slot on the same filehandle
> stacking timeouts/retries and resultant path down errors to exceed lease
> time?).

Even in the worst case where the client never gets the recall, in theory
it should take the RECALLABLE_STATE_REVOKED as a sign that it's missed
one and return its delegations.  Is the client attempting any such
recovery when it sees that flag?

> Unfortunately this problem seems to always occur at ~1AM - and
> obtaining a network capture of the problem in action has been elusive.

Anyway, sounds interesting, let us know what you find....

--b.
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