NFS deadlock on 9.2-Beta1

[Konstantin Belousov]

On Sat, Aug 24, 2013 at 04:11:09PM -0400, J David wrote:
> On Sat, Aug 24, 2013 at 3:38 PM, Konstantin Belousov
> <kostikbel at gmail.com> wrote:
> > No, at least not without reverting the r254754 first.  The IGN_SBUSY patch
> > is not critical there.
> 
> There is lots of other stuff in r250907 / reverted by r254754.  Some
> of it looks important for sendfile() performance.  If testing this
> extensively in the next few days could help get that work back into
> 9.2 we are happy to do it, but if it's too late then we can leave it
> for those on stable/9.

The revert in the r254754 is only a workaround for your workload, it does
not fix the real issue, which can be reproduced by other means.

I am not sure would re allow to merge the proper fix, since we are already
somewhere in RC3.
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