Problems with Docker images with NFS/CIFS mounts into containers in linux-azure-5.4.0-1104

[David Sanftenberg]

Hi,

As of linux-azure-5.4.0.1104 in Ubuntu Bionic (Azure) we are seeing Docker images fail to start / hang. These images mount NFS and CIFS shares into them as volumes, which I suspect might be related. I see many NFS-related changes in this new kernel version's changelog.

These same containers work fine in linux-azure-5.4.0-1103. Upgrading to 1104 reproduces the behaviour.

It would seem this kernel version has introduced either a bug or an incompatibility with our version of Docker.

Docker version output:

Server:
 Engine:
  Version: 20.10.12
  API version: 1.41 (minimum version 1.12)
  Go version: go1.16.2
  Git commit: 20.10.12-0ubuntu2~18.04.1
  Built: Mon Apr 4 20:53:56 2022
  OS/Arch: linux/amd64
  Experimental: false
 containerd:
  Version: 1.5.9-0ubuntu1~18.04.2
  GitCommit:
 runc:
  Version: 1.1.0-0ubuntu1~18.04.1
  GitCommit:
 docker-init:
  Version: 0.19.0
  GitCommit:

I'm willing to help troubleshoot the issue if needed.

Thanks