somewhat reproducable vimage panic

[Hans Petter Selasky]

On 2020-07-25 21:21, John-Mark Gurney wrote:
>>> Yeah, agreed. I think hselasky has a better fix:
>>> https://reviews.freebsd.org/D24914
>>>
>>> I just saw his e-mail in a different thread.
>> I'm testing out this patch now, and let people know how it goes.. It'll
>> be nice to not have to worry about these panics..
> So far so good...  I am getting these on occasion:
> in6_purgeaddr: err=65, destination address delete failed
> 
> But that's more that the patch prevented a panic.
> 
> The other issue that I'm now seeing is that because we don't forcefully
> clear out the multicast task, it can take a good 20+ seconds from the
> time a jail is destroyed to the interface appearing again in vnet0.
> Pretty sure this is related to the dmesg from above...

Hi,

D24914 just ensures proper draining. Feel free to accept the patch if 
you think I should submit it. It fixes some problems seen at work too!

--HPS