Re: [regression] virtio net locks up

[Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>]

Hello Stefan,

thanks for your help!

On 01/11/2012 05:04 PM, Stefan Hajnoczi wrote:
> On Wed, Jan 11, 2012 at 3:24 PM, Bernd Schubert
> <bernd.schubert@itwm.fraunhofer.de>  wrote:
>> Any idea what is going on or how to debug it?
>
> Here are a couple of ideas that would yield more information:
>
> Since the console still works I suggest checking dmesg output inside
> the guest.  Are there any error messages at the bottom?

No, absolutely nothing in dmesg.

>
> Try pinging the host's IP address from inside the guest.  Run tcpdump
> on the guest's tap interface from the host and observe whether or not
> you see any packets being sent from the guest.

Seems arp requests are still going out, but then don't go in:

17:16:21.202547 ARP, Reply 192.168.123.1 is-at 00:25:90:38:09:cd (oui 
Unknown), length 28
17:16:21.538724 ARP, Request who-has squeeze1 tell squeeze3, length 28
17:16:21.539026 ARP, Reply squeeze1 is-at 52:54:00:12:34:11 (oui 
Unknown), length 28
17:16:22.200912 ARP, Request who-has 192.168.123.1 tell squeeze3, length 28

>
> rmmod virtio_net inside the guest and then modprobe virtio_net again.
> See if network connectivity is restored (remember to rerun DHCP or
> whatever, if necessary).

Yep, that makes it work again. But probably is not the real solution ;)


Thanks,
Bernd