It looks like this bug is related to leaking of the PKRU bit.
Applying the patch from Proxmox mentioned in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2036675
resolves the issue
** Summary changed:
- 5.15.0-76: Qemu live migration causes VMs to crash but works with HWE kernel
+
** Description changed:
I am trying to live migrate Qemu VMs between Amd Zen3 to Zen2 servers.
What we expect:
VMs continue to run after live-migrate
What happened:
VMs instantly get stuck after migration with 100% CPU usage.
All Nodes are running Ubuntu 22.04.
We have
Marking the Qemu task as Incomplete, given that the problem goes away by
using a different kernel, and there's nothing specific pointing to a
Qemu bug.
** Changed in: qemu (Ubuntu)
Status: New => Incomplete
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** Also affects: qemu (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2025987
Title:
5.15.0-76: Qemu live migration causes VMs to
** Description changed:
I am trying to live migrate Qemu VMs between Amd Zen3 to Zen2 servers.
What we expect:
VMs continue to run after live-migrate
What happened:
VMs instantly get stuck after migration with 100% CPU usage.
All Nodes are running Ubuntu 22.04.
+ We have
** Description changed:
- I am trying to live migrate VMs between Amd Zen3 to Zen2 servers.
+ I am trying to live migrate Qemu VMs between Amd Zen3 to Zen2 servers.
What we expect:
- VMs continue to run after live-migrate
+ VMs continue to run after live-migrate
What happened:
VMs
** Attachment added: "lspci-vnvn-zen3.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2025987/+attachment/5684002/+files/lspci-vnvn-zen3.log
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