Comment # 5 on bug 934202 from Martin Pluskal

(In reply to Neil F Brown from comment #4)
> Could you (or anyone who can reproduce this) please collect both the tcpdump
> trace and nfs debugging with "rpcdebug -m nfs -s all".  Then when a problem
> occurs, provide:
> - the tcpdump log
# sudo tcpdump port 2049 -w nfs_dump_new.log
http://users.suse.cz/~mpluskal/bugs/934202/nfs_dump_new.log.xz
> - the kernel logs
# journalctl --dmesg > dmesg_new.txt
http://users.suse.cz/~mpluskal/bugs/934202/dmesg_new.txt.xz
> - any notes on what you noticed, including whether any processes were
> spinning.
Issue occured sometime during weekend so I just noticed error in dmesg, there
should be minimal activity on nfs mount.
> - if processes were spinning, a few copies of /proc/PID/stack for those
> processes.
> - exact kernel version.
# uname -r
4.0.4-3-desktop

Hope it helps