I built a Wily test kernel with a cherry-pick of commit 88c9281a. It can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1498206/wily Can this kernel be tested to confirm it resolves this bug? If it does, I can also built Vivid and Trusty test kernels. Thanks in advance! ** Also affects: linux (Ubuntu Wily) Importance: High Status: Triaged ** Also affects: linux (Ubuntu Vivid) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Trusty) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Vivid) Status: New => Triaged ** Changed in: linux (Ubuntu Trusty) Status: New => Triaged ** Changed in: linux (Ubuntu Vivid) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Wily) Importance: High => Medium ** Changed in: linux (Ubuntu Trusty) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Trusty) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Vivid) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Wily) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Wily) Status: Triaged => In Progress ** Changed in: linux (Ubuntu Vivid) Status: Triaged => In Progress ** Changed in: linux (Ubuntu Trusty) Status: Triaged => In Progress ** Tags added: trusty vivid wily -- 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/1498206 Title: Fix CPU lockup on Hyper-V/Azure Status in linux package in Ubuntu: Fix Committed Status in linux source package in Trusty: In Progress Status in linux source package in Vivid: In Progress Status in linux source package in Wily: Fix Committed Bug description: Description of problem: Large sized VMs with 32 VCPUs and more than 100G memory sometimes hang at boot, and the console keeps printing logs like "soft lockup - CPU#14 stuck for 23s!" This particular issue can be resolved with the following patch upstream: https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/arch/x86/kernel/cpu?id=88c9281a9fba67636ab26c1fd6afbc78a632374f Repro rate is low. To repro, provision a larger VM (i.e. G5 VM on Azure) and reboot many times, monitoring the console until the "soft lockup - CPU" error is seen. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1498206/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
