ESXi 8.0 PSODs may occur due to RevalidateActionMultiPorts module

Products

• VMware NSX
• VMware vSphere ESXi 8.0

Issue/Introduction

• NSX vibs are installed on the ESXi 
• VMkernel might encounter a race condition that results in a purple diagnostics screen with
  <timestamp>##########:[##########]EnsRevalidateActionMultiPorts@(nsxt-ens-##########)#<None>+0x11f stack: ##########, ##########, ##########, ##########, ##########
<timestamp> cpu49:##########)Panic: 783: Halting PCPU 49.
<timestamp> cpu17:##########)Backtrace for current CPU #17, worldID=##########, fp=##########
<timestamp>cpu17:##########)##########:[##########]EnsRevalidateActionMultiPorts@(nsxt-ens-##########)#<None>+0x11f stack: ##########, ##########, ##########, ##########, ##########

Cause

Multicast invalidation slab is empty which cause the allocation of new entry failure.

Resolution

This is a known issue impacting VMware NSX.

Workaround is to disable multiple port flow cache

• SSH into each ESXi host
• Disable multiple port flow cache
  net-dvs -u com.vmware.net.portset.fc.mcast.enabled -p hostPropList dvs_name
• Make the change persist across reboots 
  net-dvs --persist