Re: [Xen-devel] PV DomU running linux 3.17.3 causing xen-netback fatal error in Dom0

[Anthony Wright <anthony@xxxxxxxxxxxxxxx>]

> On 28/11/14 15:19, Anthony Wright wrote:
> > We have a 64 bit PV DomU that we recently upgraded from linux 3.3.2
> > to
> > 3.17.3 running on a 64 bit 3.17.3 Dom0 with Xen 4.4.0.
> >
> > Shortly after the upgrade we started to lose network connectivity to
> > the
> > DomU a few times a day that required a reboot to fix. We see nothing
> > in
> > the xen logs or xl dmesg, but when we looked at the dmesg output we
> > saw
> > the following output for the two incidents we investigated in
> > detail:
> >
> > [69332.026586] vif vif-4-0 vif4.0: txreq.offset: 85e, size: 4002,
> > end: 6144
> > [69332.026607] vif vif-4-0 vif4.0: fatal error; disabling device
> > [69332.031069] br-default: port 2(vif4.0) entered disabled state
> 
> The guest's frontend driver isn't putting valid requests onto the ring
> (it crosses a page boundary) so this is a frontend bug.
> 
> What guest are you running?

We're running a custom built 64 bit para-virtualised DomU with a stock Linux 
3.17.3 downloaded from kernel.org. The problem only started happening when we 
upgraded the DomU Linux kernel from 3.3.2

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