[German]The October 2023 updates for Windows Server 2022 (KB5031364) are probably causing issues with VMware ESXi. Virtual machines (VMs) running on VMware ESXi hosts may not be able to start Windows 2022 (as a guest). Affected VMs trigger a blue screen. Microsoft has now acknowledged these problems for KB5031364 in the list of known issues for Windows Server 2022 and proposes a temporary fix.
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I had previously only reported issues with Hyper-V in connection with update KB5031361 for Windows Server 2019 (and Windows 10 Enterprise 2019 LTSC) and update KB5031364 for Windows Server 2022. The virtual machines can no longer be started after installing the update or are no longer found. Uninstalling the updates in question fixes these problems. I described the situation in the blog post Windows Server 2019/2022: Updates KB5031361/KB5031364 cause Hyper-V issues and also pointed out possible solutions (renaming or deleting certain files). But there are probably also problems with VMware ESXi hosts.
KB5031364 issues with VMware ESXi hosts
As of November 8, 2023, Microsoft has acknowledged problems with VMware ESXi hosts in the Known Issues for Windows Server 2022 in connection with update KB5031364 (the colleagues here noticed this). The article Windows Server 2022 VMs running on VMware ESXi hosts might fail to start provides more details.
After installing update KB5031364 on virtual machines (VMs) running on VMware ESXi hosts, Windows 2022 (as guest operating system) may not start. Affected VMs return a blue screen with the stop code : PNP DETECTED FATAL ERROR. This issue only affects guest VMs with the following configuration on VMware ESXi hosts:
- Physical AMD Epyc processor
- The option "Expose IOMMU to guest OS" is activated in the VMware settings for the VM.
- "Enable virtualization-based security" is enabled in Windows Server 2022
- "System Guard Secure Launch" is enabled in Windows Server 2022.
Looks like the security features of Windows Server 2022 are causing problems in the guest operating system. Microsoft is working on a solution and expects it to be available in mid-November 2023 (Patchday). As a temporary workaround, Microsoft suggests disabling the "Expose IOMMU to guest OS" option.
Important: This workaround should only be used in environments where the "Expose IOMMU to guest OS" option does not need to be enabled.
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Windows Server 2019/2022: Updates KB5031361/KB5031364 verursachen Hyper-V-Probleme
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