** Changed in: linux (Ubuntu Zesty)
Status: In Progress => Fix Committed
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ThunderX: soft lockup on 4.8+ kernels when running qemu-efi with
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Status in linux source package in Yakkety:
Status in linux source package in Zesty:
VMs can cause interrupts to be disabled on the host CPU, resulting in hangs.
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.
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.
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