Re: [Xen-devel] Network drop to domU (netfront: rx->offset: 0, size: 4294967295)

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 20/05/2009 03:52, "PCextreme B.V. - Wido den Hollander"
<wido@xxxxxxxxxxxx> wrote:

> I took the kernel source and started looking where the netfront messages
> was being printed and it seemed some kind of memory allocation issue? I
> have found some old messages with patches but those did not apply to my
> current source.

The issue is that dom0 is trying to copy data to a domU-provided buffer, but
the buffer details appear bogus. Netback returns a -1 error to netfront,
which then prints out its error message. It's not immediately obvious
whether the bug is in netfront or netback. If it's an issue that crops up
with many guests then I suppose it's more likely a netback issue, which is a
pain. Do domUs lose their connection at the same time, or is it random
individual domUs losing their connection from time to time?

 -- Keir

> Since this is a running production system i can schedule a reboot for a
> new kernel, but this takes some time.



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