Public bug reported:
There's a bug in kernels before Linux 5.0 that affects NFS 4.1 connections. The
bug presents itself like this:
* On NFS clients: Attempts to access mounted NFS shares associated with the
affected server
block indefinitely.
* On the network: A storm of repeated RPCs between NFS client and server
uses a lot
of bandwidth. Each RPC is acknoledged by the server with an
NFS4ERR_SEQ_MISORDERED error.
* Other NFS clients connected to the same NFS server: Performance drops
dramatically.
A patch is available to fix this problem:
<https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3453d5708b33efe76f40eca1c0ed60923094b971>
Is is possible to integrate the patch into the 4.18 kernel series?
I'm using Ubuntu 18.04.2 LTS as NFS client an server.
Thank you.
Best regards,
Frank Burkhardt
** Affects: linux-meta-hwe (Ubuntu)
Importance: Undecided
Status: New
** Tags: bionic
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https://bugs.launchpad.net/bugs/1828978
Title:
NFS connections block while causing a high-bandwidth RPC-pingpong
between client and server
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