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It's a common problem. Have you seen these articles to help?
VDDK Deadlock encountered for VDDK 6.5.2, 6.5.2 EP1, and 6.7
VMware deadlocks occurring while running VMware 6.5.0 with VDDK 6.5.2
I examined the documents you sent. I performed the specified operations and started a backup. But again he got an error. Hardware versions of VMs receiving errors vmx-08. Could it be due to this? ESX version 6.0.0.
You need to make sure those changes are performed on the Virtual Server Agent computers and the VM's performing HotAdd. Was that done?
Certainly couldn't hurt to upgrade VMware where possible. The issue is in the VMware's VDDK.
After upgrading VVDK, we were able to get a successful backup. However, backup times are very long.