Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1498206 Title: Fix CPU lockup on Hyper-V/Azure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1498206/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
