The tests are correct, I can reproduce it in s390x. Any v4.* mount
fails, but v3 works:
root@nfs:~# mount localhost:/home /mnt/nfs_home -o vers=4.2
mount.nfs: mount system call failed for /mnt/nfs_home
root@nfs:~# mount localhost:/home /mnt/nfs_home -o vers=4.1
mount.nfs: mount system call failed for /mnt/nfs_home
root@nfs:~# mount localhost:/home /mnt/nfs_home -o vers=4.0
mount.nfs: mount system call failed for /mnt/nfs_home
root@nfs:~# mount localhost:/home /mnt/nfs_home -o vers=4
mount.nfs: mount system call failed for /mnt/nfs_home
root@nfs:~# mount localhost:/home /mnt/nfs_home -o vers=3
root@nfs:~#
And no version at all also fails:
root@nfs:~# mount localhost:/home /mnt/nfs_home
mount.nfs: mount system call failed for /mnt/nfs_home
dmesg is clean.
Strace shows, for that last attempt with no version specified:
1998 mount("localhost:/home", "/mnt/nfs_home", "nfs", 0,
"vers=4.2,addr=127.0.0.1,clientad"...) = -1 EIO (Input/output error)
** Summary changed:
- DEP8 failures in noble/s390x
+ NFSv4 fails to mount in noble/s390x
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https://bugs.launchpad.net/bugs/2060217
Title:
NFSv4 fails to mount in noble/s390x
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