Jul 19 2015

Heads up! Quiescing operations cause a Windows virtual machine to panic

I usually don’t create blog post with bug related information but i think VMware KB 2115997, Quiescing operations cause a Windows virtual machine to panic with a Stop 24 error on ntfs.sys, updated July 9 2015 is something that i need to share. I have been contacted a few times over the past weeks in regards of this issue.
When you take a snapshot of a virtual machine you might see the following:

  • Snapshot operation fails
  • The virtual machine (VM) panic with the following information:
    • A problem has been detected and Windows has been shut down to prevent damage to your computer

The problem affects the ESXi 5.x (5.0.x , 5.1.x and 5.5.x) and ESXi 6.0.x when the VM runs one of the following VMware tools versions:

  • 8.6.15
  • 9.0.15
  • 9.4.11
  • 9.10.0
  • 9.4.12

There is locally a patch available for ESXi 6.0.x, ESXi600-201507403-BG, which you can read about here.

Unfortunately there is no patch available for 5.x but there are a few workarounds

  • Install a VMware tools version that is not affected
  • Disable snapshot quiescing for your VMs
  • Don’t select “Quiesce guest file system” when manually taking VM snapshot(s)


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  1. John Skarja

    or other workaround (which we generally do as best practice):
    shutdown VM before taking a snapshot

  2. magander3

    if you can shut down the VM before making backups and or snapshots you are lucky:) I would say most of my customers can’t.



  3. Daniel

    I’ve seen problems with 9.4.6 in an active/active or active/passive DB cluster where VM panics and fails over. do you know if this version is also affected?

  4. magander3

    ok thanks for the information. I’m only aware of the versions listed in the blog post unfortunately but i really think you should contact VMware regarding this.



  5. Shane

    Just had this happen on a 5.5 guest running VM tools version 9.4.15

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