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Bug
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Resolution: Unresolved
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Blocker
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CNV v4.21.0
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None
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Quality / Stability / Reliability
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0.42
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False
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False
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None
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Critical
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Customer Reported
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None
Description of problem:
The cluster have CPU model set to "EPYC-v2". Tried an upgrade from OpenShift Virtualization 4.20.3 to 4.20.6. To upgrade the virt-launcher image, it initiated the live migration, but migrations are failing with following error:
{"component":"virt-launcher","kind":"","level":"error","msg":"migration failed with error: virError(Code=9, Domain=31, Message='operation failed: guest CPU doesn't match specification: extra features: cmp_legacy')","name":"rhel9-blue-aphid-56","namespace":"nijin-cnv","pos":"live-migration-source.go:1087","timestamp":"2026-02-09T17:07:38.730667Z","uid":"b582baec-703b-4a22-a818-584241fdd845"}
It repeatedly tried spawning the new vir-launcher pods, all failing with the same error:
NAME READY STATUS RESTARTS AGE virt-launcher-rhel9-blue-aphid-56-bdkck 0/2 Error 0 10m virt-launcher-rhel9-blue-aphid-56-fkqjp 0/2 Error 0 5m12s virt-launcher-rhel9-blue-aphid-56-h88pf 2/2 Running 0 27m virt-launcher-rhel9-blue-aphid-56-kb27w 0/2 Error 0 9m35s virt-launcher-rhel9-blue-aphid-56-kr2r8 0/2 Error 0 8m4s virt-launcher-rhel9-blue-aphid-56-vtrxn 0/2 Error 0 10m
The issue looks to be because of bug https://issues.redhat.com/browse/RHEL-146629 , although versions are not the same as reported in this bug. The source here is qemu-kvm-core-9.1.0-15.el9_6.9.x86_64 and destination is qemu-kvm-core-9.1.0-15.el9_6.18.x86_64.
Version-Release number of selected component (if applicable):
OpenShift Virtualization 4.20.6
How reproducible:
100%
Steps to Reproduce:
1. Create a VM with core > 1 in the 4.20.3 cluster. Set the CPU model on the VM spec if the cluster doesn't have any model set. 2. Upgrade the cluster to 4.20.6. 3. After the upgrade, the migrations will fail with error "guest CPU doesn't match specification: extra features: cmp_legacy"
Actual results:
VM migrations are failing after upgrading to 4.20.6 on AMD cluster with the error: "guest CPU doesn't match specification: extra features: cmp_legacy"
Expected results:
Migrations should work
Additional info:
- is related to
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- In Progress
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CNV-80464 [CLOSED LOOP for] [Tracker Bug] VM migrations are failing after upgrading to 4.20.6 on AMD cluster with the error: "guest CPU doesn't match specification: extra features: cmp_legacy"
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- New
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