Re: [Xen-devel] netfront.c: gnttab_query_foreign_access returns nonzero in network_tx_buf_gc

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 25 May 2006, at 20:58, Kirk Allan wrote:

> Here's the serial output from a debug build of xen.  The domain_crash
> does not happen on the non-debug xen.
So the problem is in netback driver, or in the map/unmap grant-table 
logic in Xen. The problem you saw in netfront is simply a knock-on 
symptom (given netfront's current inability to recover, the bail path 
there could more usefully be BUG() I suppose).
For some reason Xen has decided that the PTE that netback supplies when 
it tries to unmap a grant reference does not match up with the memory 
page that the grant reference grants access to.
 -- Keir


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