VMware ESXi 5.5 Update 3 Snapshot Bug

[UPDATE 6. Oct] The Snapshot Bug has been fixed!

VMware has a major bug in their latest ESXi 5.5 Patch, released on September 16, 2015.

Affected Product:
VMware ESXi 5.5 Update 3 (build number: 3029944)

VMware KB: KB2133118

After upgrading to VMware ESXi 5.5 Update 3 an unexpected virtual machine failure might occur after snapshot consolidation. This issues occurs due to a segmentation fault when changing the snapshot tree data-structure.

Error Messages from the virtual machines log (vmware.log):

  • SNAPSHOT: SnapshotDiskTreeFind: Detected node change
  • Unexpected signal: 11.

Currently, there is no resolution.

If you have already upgraded, perform a rollback to the latest version:

  1. Reboot ESXi Host
  2. When the Hypervisor progress bar starts loading, press Shift+R.
  3. The following warning is displayed:Current hypervisor will permanently be replaced
    with build: X.X.X-XXXXXX. Are you sure? [Y/n]
  4. Press Shift+Y to roll back the build
  5. Press Enter to boot


  1. Many thanks for highlighting this problem.

    The second option mentioned on the KB article might come in handy for those that do not wish to revert to an earlier version of ESXi:

    > Consolidate the snapshot(s) with the virtual machine powered off.

    I think that is what we will end up doing in our environment.

  2. Please update to 5.5 Update 3a to fix this issue. IT was released yesterday.

    Good day!!

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