This bug was fixed in the package linux - 6.12.0-12.12
---------------
linux (6.12.0-12.12) plucky; urgency=medium
* plucky/linux: 6.12.0-12.12 -proposed tracker (LP: #2095505)
* Miscellaneous Ubuntu changes
- [Packaging] temporarily disable signing for s390x
* Miscellaneous upstream changes
- modpost: remove unnecessary check in do_acpi_entry()
- modpost: introduce module_alias_printf() helper
- modpost: pass (struct module *) to do_*_entry() functions
- modpost: call module_alias_printf() from all do_*_entry() functions
- modpost: fix the missed iteration for the max bit in do_input()
- modpost: work around unaligned data access error
-- Paolo Pisati <paolo.pis...@canonical.com> Wed, 22 Jan 2025 15:27:46
+0100
** Changed in: linux (Ubuntu)
Status: Invalid => Fix Released
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https://bugs.launchpad.net/bugs/2064508
Title:
re-enable Ubuntu FAN in the Noble kernel
Status in iproute2 package in Ubuntu:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in iproute2 source package in Noble:
Invalid
Status in linux source package in Noble:
Fix Released
Status in iproute2 source package in Oracular:
Fix Released
Status in linux source package in Oracular:
Fix Released
Bug description:
[Impact]
In LP: #2063298, we have opted to deprecate Ubuntu FAN support because
of the maintenance overhead and the possibility of regressions /
conflicts with the new networking eBPF APIs in kernels >= 6.8.
However, we cannot disable this feature in HWE/backport kernels, so it
seems safer to adjust the Ubuntu FAN kernel patch set to ensure proper
co-existence with the updated vxlan policy requirements in newer 6.8
kernels.
The re-introduction of Ubuntu FAN should be considered as a temporary
measure, aimed at facilitating a smooth transition during its
deprecation without disrupting existing users (specifically Juju), and
enabling the backporting of 6.8 kernels to older releases.
The main plan is still to deprecate Ubuntu FAN at some point in the
future.
[Test case]
Rely on the specific Ubuntu FAN regression test to validate the proper
kernel support of this feature:
https://git.launchpad.net/~canonical-kernel-team/+git/autotest-client-
tests/tree/ubuntu_fan_smoke_test?h=autotest3
[Fix]
Re-apply the Ubuntu FAN patch set to the latest Noble kernel 6.8 and
integrate the IFLA_VXLAN_FAN_MAP attribute type in vxlan_policy to
satisfy the strict length validation check.
[Regression potential]
We may experience regressions with eBPF vxlan capabilities and
potentially specific use cases of the Ubuntu FAN technology (Juju
installations).
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