FreeBSD 11 Stable on a Xen :: bridge0 crashing server

Andrey V. Elsukov bu7cher at
Fri Jan 20 16:21:33 UTC 2017

On 20.01.2017 18:57, Trond Endrestøl wrote:
>> Here is the situation:
>> I have a VPS server from a well reputed provider (and they deserve the
>> reputation), running FreeBSD 11 stable x64 under Xen Full Virtualization
>> (HVM). I have the xn0 interface which is working fine. I intend to use VIMAGE,
>> so I compiled the kernel, added cloned_interface="bridge0" and restarted the
>> server. But as soon as I am attaching the xn0 to bridge0, the kernel is
>> panicking and the server restarting.
>> Any suggestion/pointer/test-instruction is highly appreciated.
> The code crashes at line 427 of sys/netinet/if_ether.c:
>   ARPSTAT_INC(txrequests);
> See
> stable/11 has problems accounting the outgoing octets of any xn
> interface, although this isn't connected to your case.
> Just to rule out any uncertainty, try this patch:
> See PR 213439,
> Note, I'm not a developer nor a committer, just a humble sysadmin.

This problem is unrelated. ARP statistics is global and isn't related to 
some specific interface. IMHO, the kernel panics due to missing VNET 
context. As I see from the code in sys/dev/xen, it is not capable with 

WBR, Andrey V. Elsukov

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