Outage in Azure

Awareness - Virtual Machines

Resolved Minor
July 18, 2024 - Started 4 months ago - Lasted 2 days

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Outage Details

We are aware of an issue that started on 19 July 2024 at 04:09UTC, which resulted in customers experiencing unresponsiveness and startup failures on Windows machines using the CrowdStrike Falcon agent, affecting both on-premises and various cloud platforms (Azure, AWS, and Google Cloud).CrowdStrike has released a public statement on Windows Sensor Update - crowdstrike.com addressing the matter, and it includes recommended steps for a workaround. For environments specific to Azure, further instructions are provided below:Updated: We approximate impact started as early as 19 July 2024 at 04:09UTC, when this update started rolling out.Update as of 07:30 UTC on 20 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)https://learn.microsoft.com/en-us/cli/azure/vm?view=azure-cli-latest#az-vm-restartWe have received feedback from customers that several reboots may be required, but overall feedback is that reboots are an effective troubleshooting step at this stage.Additional options for recovery:Option 1We recommend customers that can, to restore from a backup, preferably from before 19 July 2024 at 04:09UTC, when this faulty update started rolling out.Customers leveraging Azure Backup can follow the following instructions:How to restore Azure VM data in Azure portalOption 2Customers can attempt to remove the C-00000291*.sys file on the disk directly and potentially not need to perform detach and reattach disc.Open Azure AZ CLI and run the following steps 1.Create rescue VM with// Creates a rescue VM, same size as the original VM in the same region. Asks for Username and password. // Makes a copy of the OS Disk of the problem VM// Attaches the OS Disk as Data disk to the Rescue VM//az vm repair create -g {your-resource-group} -n {vm-name} --verbose"az vm repair create -g RGNAME -n VMNAME -- verbose" **NOTE: For encrypted VM run the following command:**"az vm repair create -g RGNAME -n BROKENVMNAME --unlock-encrypted-vm --verbose"2.Then run:// Runs the mitigation script on the Rescue VM which fixes the problem (on the os-disk copy attached as a data disk)//az vm repair run -g {your-resource-group} -n {vm-name} --run-id win-crowdstrike-fix-bootloop -verbose"az vm repair run -g RGNAME -n BROKENVMNAME -- run-id win-crowdstrike-fix-bootloop -- run-on-repair -- verbose"3.Final step is to run:// Removes the Fixed OS-Disk Copy from the rescue VM// Stops the problem VM but it is not deallocated// Attaches the fixed OS-Disk to the original VM// Starts the original VM// Gives prompts to delete the repair vm//az vm repair restore -g {your-resource-group} -n {vmname} --verbose"az vm repair restore -g RGNAME -n BROKENVMNAME" --verboseNote: These steps would work for both managed and unmanaged disks. In case, if you run into capacity issues, please retry after some time.Option 3Customers can attempt repairs on the OS disk by following these instructions:Troubleshoot a Windows VM by attaching the OS disk to a repair VM through the Azure portalOnce the disk is attached, customers can attempt to delete the following file:Windows/System32/Drivers/CrowdStrike/C-00000291*.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.
Components affected
East Asia - Virtual Machines Australia Southeast - Virtual Machines ‡Sweden South - Virtual Machines West India - Virtual Machines Japan West - Virtual Machines West Central US - Virtual Machines South Africa West - Virtual Machines North Central US - Virtual Machines Jio India West - Virtual Machines Canada East - Virtual Machines Brazil South - Virtual Machines Switzerland North - Virtual Machines UK South - Virtual Machines North Europe - Virtual Machines Switzerland North Norway East - Virtual Machines South Africa North - Virtual Machines Poland Central - Virtual Machines Central India Korea Central Southeast Asia - Virtual Machines Italy North - Virtual Machines Central US - Virtual Machines West US - Virtual Machines West US 2 - Virtual Machines East US - Virtual Machines East US 2 - Virtual Machines France Central - Virtual Machines West Central US Brazil Southeast - Virtual Machines West Europe - Virtual Machines Canada Central Switzerland West - Virtual Machines ‡Sweden Central - Virtual Machines Brazil South Australia East - Virtual Machines Australia Central 2 - Virtual Machines Canada Central - Virtual Machines Norway East Japan East - Virtual Machines South Africa North ‡Qatar Central - Virtual Machines Central India - Virtual Machines Australia Central - Virtual Machines Jio India Central Jio India Central - Virtual Machines Korea Central - Virtual Machines UAE North - Virtual Machines East US Japan East ‡West US 3 France South - Virtual Machines South India - Virtual Machines Australia East South India UAE North Poland Central Brazil Southeast ‡Sweden Central ‡Qatar Central Jio India West Central US France Central West Europe South Central US - Virtual Machines ‡West US 3 - Virtual Machines UK West - Virtual Machines Norway West - Virtual Machines Korea South Korea South - Virtual Machines UAE Central - Virtual Machines Sweden Central - Virtual Machines Southeast Asia Australia Southeast Australia Central Australia Central 2 South Africa West France South UK West Switzerland West Norway West ‡Sweden South East Asia UAE Central Sweden Central East US 2 North Central US South Central US West US West US 2 Canada East North Europe UK South West India Japan West Italy North

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