virtualbox 5.2.20 triggers panic with FreeBSD 12.0-ALPHA10 r339432

[Don Lewis]

On 19 Oct, Don Lewis wrote:
> On 20 Oct, Graham Perrin wrote:
>> On 19/10/2018 23:47, Don Lewis wrote:
>> 
>>> … when I attempt to start a Virtualbox VM, the system panics. … (guest) Windows 7 with
>> networking configured as > NAT and the underlying adapter being Intel PRO/1000
>> MT Desktop (82540EM). …
>> 
>> No panic here. 32-bit Windows 7 guest with the same virtual adapter.
>> 
>> $ date ; uname -v
>> Sat 20 Oct 2018 00:15:49 BST
>> FreeBSD 12.0-BETA1 r339438 GENERIC
>> $ pkg query '%o %v %R' virtualbox-ose virtualbox-ose-kmod
>> emulators/virtualbox-ose 5.2.20 poudriere
>> emulators/virtualbox-ose-kmod 5.2.20 poudriere
>> $
>> 
>> If you have not already done so, try building and installing from ports.
> 
> I'm using locally built packages and the poudriere jail is the exactly
> same source revision.

My camera isn't working at the moment, so here is a partial,
hand-transcribed DDB backtrace:

... looks like something nearby ng_ether_ifnet_arrival_cookie()
ng_ether_ifnet_arrival_cookie()
... looks like something nearby ng_ether_ifnet_arrival_cookie()
supdrvIOCtlInnerUnrestricted()
VBOXDrvFreeBSDIOCtl()
devfs_ioctl()