[Bug 260146] Using x11/konsole causes NFS hangs

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260146

--- Comment #3 from Rick Macklem <rmacklem at FreeBSD.org> ---
Hmm, looks like you are using NFSv3. If you are running
rpc.lockd, it is a fundamentally broken protocol (NLM).
- If this is the case, try either the "nolockd" mount
  option or "nfsv4,minorversion=1" for your mount.

If this doesn't resolve the problem, please provide the
output for all of the following when the hang has occurred.

nfsstat -m
ps axHl
procstat -kk
netstat -a
nfsstat -E -c  <-- done at least twice about a minute apart

Also, since you know how to reproduce the problem, you can
capture packets while it happens. Before the hang run:
tcpdump -s 0 -w out.pcap host <nfs-server>
--> Then reproduce the problem and kill the tcpdump 1 minute
    after the hang has occurred.
Put out.pcap here as an attachment.
(Btw, if you want to look at out.pcap, use wireshark. tcpdump
 knows almost nothing about NFS packets, whereas wireshark
 can decode them nicely.)

I have not heard of a FreeBSD client hang problem. There is
a known TCP layer issue, but it causes hangs when the server
is running 13.0 and I do not think the problem occurs when
the server is 12.3.

I have heard of issues when using vnet jails, but I doubt you
are doing that.

Also, hangs are often network fabric related. Disabling TSO on
both client and server often helps. Of using a different network
driver/chip if that is feasible (for example, for re devices the
driver in ports sometimes works better than what is in the system,
depending on which re chip you have.)

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