Warning: Permanently added '10.128.1.179' (ED25519) to the list of known hosts.
[*] Starting reproducer for WARNING in svc_destroy...
[+] Directory ./mnt_repro ready.
[+] Created AF_INET socket for NFS dummy server.
[+] setsockopt SO_REUSEADDR successful.
[+] Bound nfs_sfd to 127.0.0.1:2049 successfully.
[+] Listening on nfs_sfd port 2049 successfully.
[+] Started dummy NFS RPC server process (pid=5974).
[+] Successfully opened /proc/sys/fs/nfs/nfs_callback_tcpport for writing.
[+] Successfully wrote port 45454 to /proc/sys/fs/nfs/nfs_callback_tcpport.
[+] Successfully closed sysctl fd.
[+] AF_INET6 socket created successfully.
[+] setsockopt IPV6_V6ONLY successful.
[+] Bound AF_INET6 socket to [::]:45454 successfully.
[+] Listening on AF_INET6 socket port 45454 successfully.
[*] Invoking mount with options: addr=127.0.0.1,port=2049,clientaddr=127.0.0.1,sec=sys
[+] mount returned expected error: Address already in use (errno=98)
[+] Closed cb_sfd successfully.
[+] Stopped dummy NFS RPC server.
[+] Closed nfs_sfd successfully.
[+] Removed directory ./mnt_repro successfully.
[   97.531838][ T5973] NFS: callback service start failed
[+] Reproducer finished.