Azure Linux VM (Centos 6.10) NFS hangs indefinitely after Azure backup

Hi Team,

We have a Centos 6.10 server set for nightly backups. It has a relatively active NFS mount 24/7. During backups period, shortly after the entire system locks up.

lsof fails (pending IO operations hung)
df -Ph hangs indefinitely.
Nfs client left in unrecoverable state until reboot.

System runs fine until backup.
I have swap file in /etc/waagent.conf set to the tmp disk /mnt/resource if that helps with some info.

Any idea if others are experiencing this? I have a similar set of homogenous servers running in AWS and their backup works great. Seems localized to Azure backup if its enabled.