** Attachment added: "vm-start-stop.tar.gz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1673564/+attachment/4926651/+files/vm-start-stop.tar.gz
-- 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/1673564 Title: ThunderX: soft lockup on 4.8+ kernels when running qemu-efi with vhost=on Status in linux package in Ubuntu: Fix Committed Status in linux source package in Xenial: Confirmed Status in linux source package in Yakkety: Won't Fix Status in linux source package in Zesty: In Progress Bug description: [Impact] VMs can cause interrupts to be disabled on the host CPU, resulting in hangs. [Test Case] Download the attached vm-start-stop.tar.gz and unpack it. Run the start.sh script within. This will start 30 parallel loops where a VM is defined, started, allowed 60s to run, then destroyed. If the bug exists, within 10 minutes you'll see qemu processes start to hang, along with soft lockup messages on the console. Note that this script is compatible with xenial libvirt syntax - it likely needs tweaks to run in newer Ubuntu releases, just due to QEMU/libvirt changes. [Regression Risk] The code changes are restricted to ARM - but there are a lot of them. While we've attempted to stress test the proposed changes on both impacted and non-impacted (non-ThunderX) systems, it is possible that there are issues that our test isn't finding, which would likely surface as KVM guest crashes/hangs. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1673564/+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
