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Taking a snapshot or cloning the virtual machine fails with the No child processes error (2052893)

Symptoms

  • Cannot take a snapshot or clone the virtual machine
  • Taking a snapshot or cloning the virtual machine fails
  • You see the error:

    No child processes

  • The Windows Task and Events log reports the error:

    Cannot open the disk '/vmfs/volumes/Datastore/VM/VM-000003.vmdk' or one of the snapshot disks it depends on. Reason: No child processes.

  • In the vmkernel.log file, you see entries similar to:

    vmkernel: 501:23:33:35.536 cpu0:156722052)Sched: vm 156722054: 1043: name='vmm1:VM'
    vmkernel: 502:00:00:36.837 cpu2:156711206)WARNING: Cow: 1436: Opening the cow hierarchy VM-000003-delta.vmdk failed with I/O error

  • In the vmware.log file, you see entries similar to:

    vmx| DISK: Cannot open disk "/vmfs/volumes/4a2ee544-74e51ff8-5630-0019bccb08e8/vm1/vm1-000003.vmdk": No child processes (655369).
    Msg_Post: Error

    [msg.disk.noBackEnd] Cannot open the disk '/vmfs/volumes/Datastore/vm1/vm1-000003.vmdk' or one of the snapshot disks it depends on.

    [msg.disk.configureDiskError] Reason: No child processes.

  • Creating a new virtual machine and attaching the disk does not resolve the issue
  • Running the vmkfstools -t0 command on the disk reports the No child processes ¬†error

Cause

This issue occurs if the .vmdk delta file or snapshot disk is corrupted.

Resolution

To resolve this issue, restore the virtual machine from a backup.

Additional Information

For more information, see the VMware Communities article Cannot open disk "/vmfs/volumes/xxx.vmdk": No child processes (655369).

See Also

Request a Product Feature

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.

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