Re: [Xen-devel] network_alloc_rx_buffers panic

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

This indicates a bug in either XenLinux or in Xen. The network driver
must be passing a page frame number to Xen which does not belong to
that domain. So someone's accounting has gone wrong. If you enable
debugging in the Xen buil dthen you may get soem useful diagnostic
info.

 -- Keir

> 
> Some users are hitting this panic in network_alloc_rx_buffers()
> when running a big network intensive app:
>     /* Check return status of HYPERVISOR_dom_mem_op(). */
>    if ( rx_mcl[nr_pfns].args[5] != nr_pfns )
>               panic("Unable to reduce memory reservation\n");
> 
> I'm not clear on what is happening here.   Are the domains changing size?
> Which memory reservation is being reduced, xen0 or xenU?
> All the domains are v2.6.8.1, changeset 1.1331 from  Tuesday.
> 
> David
> 
> 
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