[Bug 1785788] Re: NFS breaks after wake from suspend

** Changed in: linux (Debian)
Status: Unknown => New

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https://bugs.launchpad.net/bugs/1785788

Title:
NFS breaks after wake from suspend

Status in linux package in Ubuntu:
Incomplete
Status in linux package in CentOS:
Unknown
Status in linux package in Debian:
New
Status in linux package in Fedora:
Unknown

Bug description:
Hello,

I am observing all symptoms of debian bug 898060 (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=898060) on ubuntu bionic 4.15.0-23-generic x86_64 clients
with a Centos7 NFS server (3.10.0-693.21.1.el7.x86_64).

After a wake from suspend the server always logs
kernel: NFSD: client 2001:638:redacted testing state ID with incorrect client ID
which is not observed with ubuntu 16.04 (kernel 4.4) clients. Sporadically after wake from suspend (takes days to weeks to trigger) the server logs are flooded with messages of the type
kernel: RPC request reserved 84 but used 276
and NFS on the client does not work any more. This also has not been observed with our 20 or so ubuntu 16.04 NFS clients in the last two years.

Rebooting the client appears to stop the log flooding on the server
and NFS works normally after the reboot. Remark: systemd hangs during
shutdown, presumably waiting for the NFS mount to stop, the power
button is the only remaining option.

I will upgrade to the latest bionic kernel later and try to trigger
this again.

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