FreeBSD 11 Stable on a Xen :: bridge0 crashing server

SK fbstable at cps-intl.org
Fri Jan 20 14:48:44 UTC 2017


Dear List members

Apologies for cross posting to two other lists -- was not sure which one 
is more appropriate for this, as it may be related to stable, xen or 
virtualization.

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.

The provider confirmed that they found similar behaviour on a freshly 
installed/provisioned FreeBSD 11 x64 system.

Further to that, the provider ran some tests, and what they are telling 
me is if they install/provision FreeBSD 10 x64, there is no problem with 
attaching bridge0 to xn0. Then they updated/upgraded that box to FreeBSD 
11 x64, and that too worked when they attached bridge0 to xn0. However, 
they are yet to come back with my request to build a custom kernel with 
options VIMAGE and try it out.

In the meanwhile, I took a crash dump and followed the FreeBSD handbook 
(not that it gave me much idea, I'm not a programmer nor am at that 
level of skillsets). The dump/debug is available at 
http://pastebin.com/XuWvJHUZ for anyone who is interested.

Just wondering how to go about it. I do need to have bridge0 with xn0 
and all the epairs I'm going to use for my jails.

Any suggestion/pointer/test-instruction is highly appreciated.

Best regards
SK


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