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Re: [Xen-devel] NFS related netback hang

On Thu, 2013-04-11 at 17:39 +0100, Wei Liu wrote:
> On Thu, Apr 11, 2013 at 02:55:48PM +0100, G.R. wrote:
> > Hi,
> > I'm suffering from strange NFS related network issue for a while.
> > 
> > The issue shows up when copying from dom0 to domU through a NFS mount.
> > After a short while, the transfer suddenly freezes and the domU
> > network simply stops any response. Force mounting the NFS mount
> > generally resolves the freeze. But some times you can really be in
> > bad luck that the trick does not work.
> > 
> > Lucky enough, I captured the following log in a recent instance. It
> > appears to be a dead-lock when the netback tries to get some free
> > pages from NFS. I'm not sure if this is the whole story. Any
> > suggestion how to solve the issue?
> > 
> Ian, does this look familiar to you? IIRC you once discovered some NFS
> bug related to SKB life cycle tracking.

Not with upstream netback which does grant copy not grant maps.


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