This bug was fixed in the package nova - 3:25.2.1-0ubuntu2~cloud0
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nova (3:25.2.1-0ubuntu2~cloud0) focal-yoga; urgency=medium
.
* New update for the Ubuntu Cloud Archive.
.
nova (3:25.2.1-0ubuntu2) jammy; urgency=medium
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* d/p/libvirt-remove-default-cputune-shares-value.patch:
Enable launch of instances with more than 9 CPUs on Jammy
(LP: #1978489).
** Changed in: cloud-archive/yoga
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1978489
Title:
libvirt / cgroups v2: cannot boot instance with more than 16 CPUs
Status in Ubuntu Cloud Archive:
Invalid
Status in Ubuntu Cloud Archive yoga series:
Fix Released
Status in OpenStack Compute (nova):
In Progress
Status in nova package in Ubuntu:
Fix Released
Status in nova source package in Jammy:
Fix Released
Bug description:
Description
===========
Using the libvirt driver and a host OS that uses cgroups v2 (RHEL 9,
Ubuntu Jammy), an instance with more than 16 CPUs cannot be booted.
Steps to reproduce
==================
1. Boot an instance with 10 (or more) CPUs on RHEL 9 or Ubuntu Jammy
using Nova with the libvirt driver.
Expected result
===============
Instance boots.
Actual result
=============
Instance fails to boot with a 'Value specified in CPUWeight is out of
range' error.
Environment
===========
Originially report as a libvirt but in RHEL 9 [1]
Additional information
======================
This is happening because Nova defaults to 1024 * (# of CPUs) for the
value of domain/cputune/shares in the libvirt XML. This is then passed
directly by libvirt to the cgroups API, but cgroups v2 has a maximum
value of 10000. 10000 / 1024 ~= 9.76
[1] https://bugzilla.redhat.com/show_bug.cgi?id=2035518
====================================
Ubuntu SRU Details:
[Impact]
See above.
[Test Case]
See above.
[Regression Potential]
We've had this change in other jammy-based versions of the nova package for a
while now, including zed, antelope, bobcat.
To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-archive/+bug/1978489/+subscriptions
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