[Bug 1906418] Re: igc driver for Comet Lake onboard 15f3 NIC drops all igmp packets

I was having the problem on ubuntu-20.04.2-live-server-amd64.

I tried booting on live ubuntu-20.04.2-live-server-amd64 which has
kernel 5.11 and the problem is fixed on my side.

I even tried booting on live ubuntu-20.04.2.0-desktop-amd64 which is
kernel 5.8 and the issue is also fixed.

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https://bugs.launchpad.net/bugs/1906418

Title:
igc driver for Comet Lake onboard 15f3 NIC drops all igmp packets

Status in linux package in Ubuntu:
Confirmed

Bug description:
This is occurring on Ubuntu 20.04 with kernel 5.4.0-56-generic.

To demonstrate, run
$ sudo tcpdump -nv -ienp4s0 igmp
(adjusting the interface name appropriately).

The result will be 0 packets captured, even though all other Ubuntu
systems on the same ethernet lan are reporting igmp queries from the
router and responding with reports every minute or so.

One consequence of this is that a CUPS server using the Comet Lake
onboard ethernet controller cannot be detected by any clients, except
within the first 120 seconds after restarting the avahi-daemon. Since
the Comet Lake server does not receive the igmp queries, it does not
respond with a report and so the router unsubscribes the interface
from the multicast group that is used by avahi and bonjour. This
makes the CUPS server disappear.

The output of ubuntu-bug linux is attached.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: culler 2071 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-11-17 (13 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: Gigabyte Technology Co., Ltd. Z490I AORUS ULTRA
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic root=UUID=bdba1f28-6903-467f-abfa-10c6bee47cd7 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
RelatedPackageVersions:
linux-restricted-modules-5.4.0-56-generic N/A
linux-backports-modules-5.4.0-56-generic N/A
linux-firmware 1.187.4
Tags: focal
Uname: Linux 5.4.0-56-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 11/03/2020
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F6b
dmi.board.asset.tag: Default string
dmi.board.name: Z490I AORUS ULTRA
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF6b:bd11/03/2020:svnGigabyteTechnologyCo.,Ltd.:pnZ490IAORUSULTRA:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnZ490IAORUSULTRA:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: Z490 MB
dmi.product.name: Z490I AORUS ULTRA
dmi.product.sku: Default string
dmi.product.version: -CF
dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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