Public bug reported:
Opening at the request of Serge Hallyn.
We're seeing interfaces dropping after relatively short periods of
uptime (days) on bridged guests that have been upgraded to 8.10 to 10.04
on the same Xen host (Centos 5.5).
Our guests have two interfaces on the guest connected to the same bridge
on the Xen host. In all situations (we've experienced this a dozen+
times), only *one* of these interfaces has dropped, and usually during
periods of high load. We're able to SSH into the guest on the non-
affected interface, and running ifup/ifdown on the affected interface
does not resolve the issue. A reboot is required to bring the interface
back up.
Another interesting thing to note is that we have *not* experienced this
behavior on any newly installed 10.04 guests - only guests that were
upgraded from 8.10 to 10.04. In more than one case, reinstalling 10.04
on a guest experiencing this problem more than once a week has prevented
it from reoccurring ever since (months). The problem not reoccurring
doesn't necessarily mean the upgrade is what caused it since we can't
manually trigger the problem, but it's worth mentioning.
brctl show
ifconfig -a
iptables -vnL
iptables -vnL -t nat
Output on affected guest:
https://gist.github.com/26ce1eea5a1db0ae26a6#file_output_on_affected_guest
Output on affected host:
https://gist.github.com/26ce1eea5a1db0ae26a6#file_output_on_host
We don't use qemu. Here's the xm list --long for this guest:
https://gist.github.com/26ce1eea5a1db0ae26a6#file_xen_list_for_guest
Guest network info:
https://gist.github.com/26ce1eea5a1db0ae26a6#file_guest_network_info
One additional thing we've noticed is that upgraded guests have the
xen_netfront and xen_blkfront kernel modules loaded, while newly
provisioined ones do not.
Please let me know if any additional info would be helpful! I'd be happy
to help debug in any way.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/728519
Title:
Bridged Guests losing network connectivity under non-ubuntu Xen after
upgrade from 8.10 to 10.04
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