Enable multicast in the "kvm" kernels

Bug #1946672 reported by Slawek Kaplonski
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
cloud-images
Undecided
Unassigned
linux-kvm (Ubuntu)
Undecided
Unassigned
Focal
Medium
Unassigned

Bug Description

I work in the OpenStack Neutron project and recently I wanted to optimize our CI scenario jobs by using Ubuntu minimal image as guest image for some tests (see patch https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/813195)
Unfortunately it seems that there is problem with one multicast scenario test while using ubuntu-minimal image (https://cloud-images.ubuntu.com/minimal/releases/focal/release/ubuntu-20.04-minimal-cloudimg-amd64.img). The problem is that VM booted from that image don't subscribes properly to the IGMP multicast group thus test is failing.
All works fine when image https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.img is used in the same test.

The problem is that in the minimal image kernel linux-image-kvm (vs. linux-image-generic in the "regular" cloud image) and that "-kvm" image has disabled MULTICAST:

# CONFIG_IP_MULTICAST is not set

Would it be maybe possible to enable this option in the kernel used in the "minimal" cloud images?

Revision history for this message
John Chittum (jchittum) wrote :

Thanks for opening this. We'll take this to the kernel team as well.

For completeness, do you want us to investigate this on all currently support KVM kernels and images?

Stefan Bader (smb)
Changed in linux-kvm (Ubuntu Focal):
importance: Undecided → Medium
status: New → Fix Committed
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