ESXi 8.x Host may Lock Up on Cisco UCS M7 Hardware

Products

• VMware vSphere ESXi

Issue/Introduction

• ESXi host becomes unresponsive and the server will need to be rebooted to recover.

• Preliminary log review shows no relevant errors in vmkernel.log before the reboot event.
  

  /var/run/log/vmkernel.log
  In(182) vmkernel: cpu##:#####)Unmap6: #####: [DATASTORE]: Acquired UC with 0 OP ucOffset ##### ucIndex: 103
  In(182) vmkernel: cpu##:#####)Unmap6: #####: [DATASTORE]: Unmap capability 0 OP i: 0 offset: 65536 endROffset: 589824 Acquired: TRUE
  In(182) vmkernel: VMB: 65: Reserved 4 MPNs starting @ 0x4c4    -------------> BOOT sequence
  In(182) vmkernel: EFI: 250: 64-bit EFI v2.90 revision 327712

   

• Affected ESXi Host is Cisco UCS M7 Server Hardware model with BIOS version 4.3.6c

    Hardware Model: UCSX-210C-M7
    BIOS Version: X210M7.4.3.6c.0.0620251803

  
  
  

Environment

VMware vSphere ESXi 8.0.x

Cause

Cisco UCS M7 Server can become unresponsive due to an incorrectly handled error-correcting code (ECC) error. This issue is only applicable to Intel-based platforms that are running the releases specified above.

External Cisco link for reference on the same: Cisco Field Notice FN74355

Resolution

 Please engage Cisco Support for further assistance.