After updating also the NFS server, after fiddling a bit with NFS
parameters, after hitting my head around the room... i've found a
solution.
AFAIK NFSv3 use a ''nonstandard'' ACL mechanism that works well only
for POSIX ACL, while NFSv4 use a more complex one, suited to take into
account different ACL schemas.
I use POSIX ACL, so NFSv3 is well suited for me.
Simply i've had in /etc/fstab:
dixie:/srv/wviola/sources /srv/wviola/sources nfs acl 0 0
and worked perfeclty[1] just before rebooting the NFS client machine.
Now i was forced to put instead:
dixie:/srv/wviola/sources /srv/wviola/sources nfs nfsvers=3,acl 0 0
so seems to me that ''something'' changed the default NFS version from
3 to 4.
Trying to downgrade lead me to the suspect that the guilty is not the
kernel; but really i've gone back on upgrade history and found nothing
related to NFS of mount upgraded recently...
Boh...
[1]: i was sure because i've a cron script that hourly try to mangle ACLs,
and never complained about missing ACL before the reboot...
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