Comment 31 for bug 633392

We're also seeing interfaces dropping after upgrading bridged 8.10 guests to 10.04 on the same Xen host (Centos 5.5). This is the most similar bug report I can find at the moment, so I'm describing our experiences here.

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.

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.

We have a dozen or so systems that have been affected by this, and several hundred that are in danger of losing network connectivity without a fix. Please let me know if I should file a new bug, or if any additional information would help debug! This happens weekly, and when we lose a single, we're still able to access the guest via another interface, so that might be a nice avenue towards isolating the bug.