This didn’t make any difference unfortunately. The ls command looks already getting stuck.
What I found in syslog when docker stop eventually tries to kill the container:
Feb 28 14:14:08 nuala dockerd[897]: time=“2020-02-28T14:14:08.348567783Z” level=info msg=“Container failed to stop after sending signal 15 to the process, force killing”
Feb 28 14:14:08 nuala dockerd[897]: time=“2020-02-28T14:14:08.348666753Z” level=error msg=“Stop container error: Failed to stop container 49f2314af13752be4884bf699cc837f0b19e3efa26666249ab206cc110ee211f with error: Cannot kill container 49f2314af13752be4884bf699cc837f0b19e3efa26666249ab206cc110ee211f: all SubConns are in TransientFailure, latest connection error: connection error: desc = "transport: Error while dialing dial unix /run/containerd/containerd.sock: connect: connection refused": unavailable”
Feb 28 14:14:08 nuala dockerd[897]: time=“2020-02-28T14:14:08.399354238Z” level=info msg=“Daemon shutdown complete”