freebsd stable - Sep 2017 - 11.1 running on HyperV hn interface hangs

No sure if -stable is the right mailing list for this one.

We recently moved our software from 11.0-p9 to 11.1-p1, but looks like there
is a regression in 11.1-p1 running on HyperV (Windows/HyperV 2012 R2) where
the virtual hn0 interface hangs with the following kernel messages:

 hn0: <Hyper-V Network Interface> on vmbus0
 hn0: Ethernet address: 00:15:5d:31:21:0f
 hn0: link state changed to UP
 ...
 hn0: RXBUF ack retry
 hn0: RXBUF ack failed
 last message repeated 571 times

It requires a restart of the HyperV VM.

This is a customer production server (remote customer ~4000km away) running
fairly critical monitoring software, so we needed to roll it back to 11.0-p9.
We only have two customers running our software in HyperV, vs lots in VMware
and a handful on physical hardware.

11.0-p9 has been very stable.  Has anyone seen this problem before with 11.1 ?

11.1 is listed here
 https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/supported-freebsd-virtual-machines-on-hyper-v

	Paul.
-- 
Paul Koch | Founder | CEO
AKIPS Network Monitor | akips.com
Brisbane, Australia

> We recently moved our software from 11.0-p9 to 11.1-p1, but looks like
there
> is a regression in 11.1-p1 running on HyperV (Windows/HyperV 2012 R2) where
> the virtual hn0 interface hangs with the following kernel messages:
> 
>   hn0: <Hyper-V Network Interface> on vmbus0
>   hn0: Ethernet address: 00:15:5d:31:21:0f
>   hn0: link state changed to UP
>   ...
>   hn0: RXBUF ack retry
>   hn0: RXBUF ack failed
>   last message repeated 571 times
> 
> It requires a restart of the HyperV VM.
> 
> This is a customer production server (remote customer ~4000km away) running
> fairly critical monitoring software, so we needed to roll it back to
11.0-p9.
> We only have two customers running our software in HyperV, vs lots in
VMware
> and a handful on physical hardware.
> 
> 11.0-p9 has been very stable.  Has anyone seen this problem before with
11.1 ?

I don't run anything on local hyper-v anymore, but I do run a ot of 
stuff in Azure, and we havent seen anything like this. I track STABLE 
for things though, updating after reading the commits and testing 
locally for a week or so, so the version I am running currently is 
r320175, which was part of 11.1-BETA2. I am going to upgrade to a more 
recent STABLE sometime this weke or next though, will do that on a test 
amchine and let you now how it goes.

I seem to recall that there were some large changes to the hn code in 
August to add virtual function support. When does 11.1-p1 date from ?

-pete.