Ok when this goes, you do have a short window when the machine is still responding to existing ssh connections. I managed to get the attached dmesg from the machine before I lost it (running 3.10.0-3 from the archive at the time).
** Attachment added: "DMESG" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1204005/+attachment/3746319/+files/DMESG -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1204005 Title: [saucy] kvm host hangs of guest boot with 3.10.0-5 Status in “linux” package in Ubuntu: Triaged Bug description: When booting KVM instances on 3.10.0-5 the HOST will hang hard as the graphics switch over from plymouth to the main display. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1204005/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp