Re: Questions about XSA39

[Nick Pegg <npegg@linode.com>]

On 3/1/13 6:52 AM, Wei Liu wrote:
> On Thu, 2013-02-28 at 20:36 +0000, Nick Pegg wrote:
>> Hi Xen developers,
>>
>> I had some questions regarding XSA39, and I hope you all can answer them.
>>
>> We've been rolling out some hosts with the XSA39 patch applied and have
>> come across a problem where a few of our customer DomUs keep hitting the
>> conditions which call netbk_fatal_tx_err(), mostly "Frag is bigger than
> 
> "mostly" or "all"? As all the reports I've seen so far are "Frag is
> bigger than frame", so it would be interesting to know whether there's
> any other error as well.
> 
> We're investigating whether this is a genuine bug in Xen netfront /
> netback implementation, or it is something in kernel generating bogus
> packet. The solution to this issue may different depending on various
> factors.
> 
> 
> Wei.
> 

After digging through our recent logs, we had four occurrences of "Too
many frags." All others (>85%) were "Frag is bigger than frame."


-Nick