I've upgraded my system to linux-image-5.3.0-40-generic and it fix the problem!
Here is my procedure :
- restore a backup from before the 5.0.0-1032-azure kernel update
- restart the vm
- sudo apt update
- sudo apt upgrade
- sudo apt install --install-recommends linux-generic-hwe-18.04
- restart the vm

after the restart the applied kernel is linux-image-5.3.0-40-generic.

The server can reboot and the application can restart normally without
any CPU lock issue.

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https://bugs.launchpad.net/bugs/1863978

Title:
  boot failing - unable to handle kernel paging request - followed by
  oops

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