nfs4_reclaim_open_state: Lock reclaim failed!

From	Emil Flink <emil.flink@bublar.com>
Newsgroups	linux.debian.user
Subject	nfs4_reclaim_open_state: Lock reclaim failed!
Date	2017-12-04 10:00 +0100
Message-ID	<uSULx-2yp-9@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi,

I'm not sure where to go with this issue so please free to point me to
a more suitable forum if necessary.

My issue is that a client mounting a NFS share frequently locks up
with massive amounts of "nfs4_reclaim_open_state: Lock reclaim
failed!" in the kernel logs. Meanwhile the NFS server does not log any
errors as far as I can tell.

I only encounter this when the client is doing a lot of I/O against
the NFS share.

To recover from this I have to kill all processes on the client using
the NFS share, unmount the NFS share and remount it.

The NFS export is mounted with:
10.0.1.203:/nfs/lxc-office on /var/lib/lxc type nfs4
(rw,noatime,vers=4.2,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=10.0.1.231,local_lock=none,addr=10.0.1.203)

Both the server and the client is running up-to-date installations of
Debian 9 ("stretch"), meaning kernel 4.9.0-4 and nfs-common /
nfs-kernel-server 1.3.4-2.1.


Regards,

Emil Flink

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nfs4_reclaim_open_state: Lock reclaim failed! Emil Flink <emil.flink@bublar.com> - 2017-12-04 10:00 +0100
  Re: nfs4_reclaim_open_state: Lock reclaim failed! Roberto C. Sánchez <roberto@debian.org> - 2017-12-04 14:30 +0100

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