I've reported it ages ago when 10 was on 'CURRENT', but it seems there's were 
never resources (people with the knowledge) available to look into the issue.

See: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188369

I've reported it months before on the xen-devel list too, but IIRC that's where 
the most recent info is... 

Sadly all I could do was test and report my findings, but it seems something 
changed regarding tso or checksum in the netfront code or even elsewhere, I 
honestly have no idea, but I found a very similar issue on windows guests 
running on netbsd hosts cause the PV drivers were assuming features the netbsd 
backend doesn't have.

My theory is freebsd 10 as a similar issue, in my findings disabling 
tso/checksum stops the panic but I still had no network.

Anyway if interested I guess all info is in the PR.

I do hope this gets attention and maybe someone has the knowledge/time to fix 
it.

On May 28, 2015 5:03:56 AM GMT+01:00, Dean Anderson <d...@av8.net> wrote:
>Yes.  Is that a known problem?
>
>On Thu, 28 May 2015, Miguel Clara wrote:
>
>> 
>> Is this on a NetBSD dom0?
>> 
>> 
>> On May 28, 2015 4:52:56 AM GMT+01:00, Dean Anderson <d...@av8.net>
>wrote:
>> 
>> The 10.1 distribution, fresh install, immediately panics on any
>ssh/scp 
>> in or out. It was running as an hvm under Xen 4.2.5.
>> I'd send you more but its too hard to get a dump from the system, and
>it 
>> appears pretty easy to reproduce.  Good luck.
>>    --Dean
>>
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