I think the following would be a worthy challenge to an AI: (entire prompt follows) My NFSv4.2 server occasionally prints this and then some `[nfsd]` processes hang. They cannot be killed and the clients that made a request to them will also hang. Processes that were using that NFS mount will become zombies if we try to SIGKILL them ``` Dec 16 16:16:05 host-00 kernel: receive_cb_reply: Got unrecognized reply: calldir…
Disable NFSv4.2 features: Although you mentioned that your mounts are read-only, it's still possible that some NFSv4.2 features might be causing issues. You can try disabling some of these features by adding the following options to your NFS mount command:
vers=4.1,minorversion=1,proto=tcp,sec=sys
This will force the client to use NFSv4.1 with TCP and system authentication.