I confirmed the patch is in the upstream 3.19 kernel linux-3.19.y-queue branch. That means it should be in the next 3.19 upstream release: v3.19.8-ckt8. It will then make it's way into Vivid when the 3.19.8-ckt8 updates are applied to the Vivid kernel.
This is the commit in upstream 3.19: commit 74686cbfa06190b821424133d0852815cbe338ad Author: Jan H. Schönherr <[email protected]> Date: Wed Aug 12 21:35:56 2015 +0200 sched: Fix cpu_active_mask/cpu_online_mask race -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1508609 Title: [Hyper-V] Race condition in SMP bootup To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1508609/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
