** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux-meta-hwe (Ubuntu)
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: New => Fix Released
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Matthew Ruffell (mruffell)
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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
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Disco:
In Progress
Bug description:
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
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