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Applies to: ✔️ Linux VMs
Original KB number: 4099558
Important
New! Try VM assist to resolve top issues. We recommend that you run VM assist for Windows or VM assist for Linux. These script-based diagnostic tools help you identify common issues that affect the Azure VM Guest Agent and overall VM health.
If you're experiencing performance problems on VMs, run these tools first before you contact Microsoft Support.
Symptoms
The Linux VM Agent doesn't process extensions. Because of this failure, some extensions stop running. This issue affects some dependent Azure services, such as Azure Backup Azure Site Recovery.
When this issue occurs, you see extension downgrade error entries in /var/log/waagent.log that resemble the following example:
2018/03/16 12:00:46.196121 ERROR Event: name=extensionName, op=None, message=[ExtensionError] Downgrade not allowed, duration=0
Note
This behavior occurs in Linux VM Agent versions 2.2.21 to 2.2.24.
Status
Microsoft is taking steps to automatically resolve this issue for affected VMs. On those VMs, an additional Microsoft extension is being installed:
- Extension Publisher: Microsoft.CPlat.Core
- Extension Type: RunCommandLinux
Resolution
To resolve this issue without waiting for the fix from Microsoft, you can remove all *.manifest.xml files in /var/lib/waagent/.
Contact us for help
If you have questions, you can ask Azure community support. You can also submit product feedback to Azure feedback community.