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Last updated: 07/19/2024 12:47:23 UTC

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InformationAwareness - Virtual Machines

We have been made aware of an issue impacting Virtual Machines running Windows Client and Windows Server, running the CrowdStrike Falcon agent, which may encounter a bug check (BSOD) and get stuck in a restarting state. We approximate impact started around 19:00 UTC on the 18th of July.Additional details from CrowdStrike are available here: Statement on Windows Sensor Update - crowdstrike.comUpdate as of 10:30 UTC on 19 July 2024:We have received reports of successful recovery from some customers attempting multiple Virtual Machine restart operations on affected Virtual Machines. Customers can attempt to do so as follows:Using the Azure Portal - attempting 'Restart' on affected VMsUsing the Azure CLI or Azure Shell (https://shell.azure.com)We've received feedback from customers that several reboots (as many as 15 have been reported) may be required, but overall feedback is that reboots are an effective troubleshooting step at this stage.Additional options for recovery:We recommend customers that are able to, to restore from a backup from before 19:00 UTC on the 18th of July.Customers leveraging Azure Backup can follow the following instructions:How to restore Azure VM data in Azure portalAlternatively, customers can attempt to repair the OS disk offline by following these instructions: Attach an unmanaged disk to a VM for offline repairDisks that are encrypted may need these additional instructions:Unlocking an encrypted disk for offline repairOnce the disk is attached, customers can attempt to delete the following file. Windows/System/System32/Drivers/CrowdStrike/C00000291*.sysThe disk can then be attached and re-attached to the original VM.We can confirm the affected update has been pulled by CrowdStrike. Customers that are continuing to experience issues should reach out to CrowdStrike for additional assistance.Additionally, we're continuing to investigate additional mitigation options for customers and will share more information as it becomes known.

This message was last updated at 11:36 AM UTC on July 19, 2024

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