It's been running on 3.16rc3 upstream for 30 hrs now and the problem has not reoccured. With 3.13 I'd see the problem after 12-24 hours, so this is a good sign.
Linux 3.16.0-031600rc3-generic #201406291835 SMP Sun Jun 29 22:36:41 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux Marking it as kernel-fixed-upstream-3.16-rc3. I'll keep it on this kernel for at least the next few days (probably longer) and will update this bug if anything changes. ** Tags added: kernel-fixed-upstream kernel-fixed-upstream-3.16-rc3 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1332409 Title: [Supermicro X9DR3-F] Virtual machines hang in kernel 3.13 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1332409/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs