I experience the same issue:
Kernel on the nfs client:
#> uname -a
Linux ar 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
Here's the fstab line for the nfs4 mount:
server:/ /network/srv nfs4
noauto,user,x-systemd.automount,x-systemd.device-timeout=10,x-systemd.idle-timeout=0,rw,sec=sys,relatime,vers=4.2,hard,intr,proto=tcp,timeo=30,retrans=2,port=2049,x-systemd.requires=nfs-client.target
0 0
#> ls /network/srv
music videos
#> ls /network/srv/music
/bin/ls: cannot open directory '/network/srv/music': Operation not permitted
Kernel on the NFS server:
#> uname -a
Linux ossrv 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
Here's the /etc/exports file on the NFS server:
/export
192.168.0.0/16(fsid=0,rw,crossmnt,insecure,no_subtree_check,async,anonuid=65534,anongid=65534)
/export/music 192.168.0.0/16(rw,crossmnt,insecure,no_subtree_check,async)
/export/videos 192.168.0.0/16(rw,crossmnt,insecure,no_subtree_check,async)
When i boot the kernel version 4.4.0-28-generic (or before) on the NFS
client is working fine.
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https://bugs.launchpad.net/bugs/1603719
Title:
NFS client: access problems after updating to kernel 4.4.0-31-generic
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