RE: [Xen-devel] can't create any more pv-on-hvm domains after~38under 3.3-testing

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> We have been investigating a similar sounding bug (hung pages with
> elevated reference counts) that occur when blkback requests are issued
> over an iSCSI backend device.  The block requests appear to be running
> afoul of the lazy copy optimization added for netback.  In this path,
> foreign pages (assumed to be netback pages?) are manipulated specially
by
> the dma layer of the dom0 network stack.  On return to netback, the
page
> refs are cleaned up.
> 

In my case it appears to be always a single page - if they were grants
on the ring then I would think I would be occasionally seeing zero or
multiple pages, so I think we might be chasing different issues.

James

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