[LU-12803] lustre in staging interferes with 2.12.2 on Ubuntu 18.04

Related — Thu, 21 Nov 2019 21:50:11 +0000

We have a number of old compute systems which have raid controllers, We are migrating these from a mix of redhat 7.6 and ubuntu 12.04 to ubuntu 18.04. The raid controllers on these systems require kernel modules from the distribution kernel-modules-extra package to function (e.g. to be able to drive the root filesystem device /dev/sda ).

We use dkms packages to install lustre modules

There is a version of lustre in the staging area of the -extra modules package in Ubuntu 18.04. This lustre system has a version of libcfs.ko version 0.7.0 while the libcfs.ko generated from a lustre 2.12.2 source tree has a libcfs.ko version 0.5.0 I have edited the source to bump the version of libcfs.ko to 0.8.0 and that results in a module that works on an 18.04 system with the modules-extra package installed.

We need a the source tree to support lustre while the staging modules are available.

For example, inspecting the Ubuntu 18.04 module

root@bc-25-1-02:~# modinfo /lib/modules/4.15.0-64-generic/kernel/drivers/staging/lustre/lnet/libcfs/libcfs.ko
filename:       /lib/modules/4.15.0-64-generic/kernel/drivers/staging/lustre/lnet/libcfs/libcfs.ko
license:        GPL
version:        0.7.0
description:    Lustre helper library
author:         OpenSFS, Inc. <http://www.lustre.org/>
srcversion:     3EAA7DAA70F86FD8F262DC1
depends:
staging:        Y
retpoline:      Y
intree:         Y
name:           libcfs
vermagic:       4.15.0-64-generic SMP mod_unload

Cf the upstream dkms:

root@farm5-head1:~# modinfo /lib/modules/4.15.0-64-generic/updates/dkms/libcfs.ko
filename:       /lib/modules/4.15.0-64-generic/updates/dkms/libcfs.ko
license:        GPL
version:        0.5.0
description:    Lustre helper library
author:         OpenSFS, Inc. <http://www.lustre.org/>
srcversion:     01F59272261BC3745941E9A
depends:
retpoline:      Y
name:           libcfs
vermagic:       4.15.0-64-generic SMP mod_unload

Whamcloud Community JIRA

[LU-12803] lustre in staging interferes with 2.12.2 on Ubuntu 18.04