Testing with ppa kernel 3.19.8-031908ckt6-generic seems to resolve the issue. At least no more crashes/freezes have occurred since then. I have added the 'kernel-fixed-upstream" tag as requested.
** Tags added: kernel-fixed-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1495696 Title: NMI watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [firefox:2278] To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1495696/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs