Re: hang on xfstests generic/074

[Benjamin Coddington <bcodding@redhat.com>]

On Fri, 1 Apr 2016, Trond Myklebust wrote:

> On Fri, Apr 1, 2016 at 10:57 AM, Benjamin Coddington
> <bcodding@redhat.com> wrote:
> > On Wed, 11 Feb 2015, Christoph Hellwig wrote:
> >
> >> On Tue, Feb 10, 2015 at 10:43:06AM -0500, J. Bruce Fields wrote:
> >> > I finally got around to running xfstests as part of my regular testing
> >> > and ran across a reproduceable hang on generic/074:
> >>
> >> Yes, I reported this about half a year ago.  It was caused (or at least
> >> unhidden) by commit 2aca5b869ace67a63aab895659e5dc14c33a4d6e ("SUNRPC:
> >> Add missing support for RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT"). Reverting
> >> that commit fixes the issue for me.
> >
> > I just ran into this.
> >
> > Now that we have SO_REUSEPORT, can we get rid of
> > RPC_CLNT_CREATE_NO_RETRANS_TIMEOUT?
>
> They are unrelated.
>
> If you are hitting this hang, then you have borked server that is
> dropping NFSv4 RPC requests. The old behaviour of having the client
> break the connection is not actually sanctioned by the NFSv4 protocol.
>
> Cheers
>   Trond

Ah, thanks for pointing that out.  It is a server bug, I think.  I'm trying
to find out more, and I'll write about it under separate cover.

Ben