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NFS locks debian12/debian13/Opensuse

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[Please advice if a better group exists for this question]

I have three PCs (1 each of Debian-12, Debian-13 and OpenSuse-15.6).
Each PC NFS-mounts a common directory from an NFS-Server (OpenSuse-15.6).

Mount options look the same on all three:

    Opensuse:
    xxx on xxx type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.164,local_lock=none,addr=192.168.1.190)

    Debian12
    xxx on xxx type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.168,local_lock=none,addr=192.168.1.190)

    Debian13
    xxx on xxx type nfs4 (rw,relatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.179,local_lock=none,addr=192.168.1.190)


When I try to 'flock' a file in a directory on that share simultaneously
on all 3 machines:
    % flock foobar sh -c 'echo start ; sleep 10 ; echo end'

- when any Debian-machine holds the lock:
  - the other two block as expected

- when the Opensuse machine holds the lock:
  - the Debian-12 machine blocks as expected
  - the Debian-13 machine fails with
    % flock foobar sh -c 'echo start ; sleep 10 ; echo end'
    flock: foobar: Input/output error

Any hint why the Debian-13 fails when Opensuse holds the lock?
Any hint where to start to look for answers?

TNX
R'

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NFS locks debian12/debian13/Opensuse Ralf Fassel <ralfixx@gmx.de> - 2026-02-05 17:53 +0100
  Re: NFS locks debian12/debian13/Opensuse Lumin Etherlight <lumin@etherlight.link> - 2026-02-16 22:22 +0300

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