Re: [Intel-wired-lan] igc: Network failure, reboot required: igc: Failed to read reg 0xc030!

["Lifshits, Vitaly" <vitaly.lifshits@intel.com>]

On 9/14/2024 12:52 AM, Jesper Juhl wrote:
> On Fri, 13 Sept 2024 at 09:02, Lifshits, Vitaly
> <vitaly.lifshits@intel.com> wrote:
>> On 9/12/2024 10:45 PM, Jesper Juhl wrote:
>>>> Would you be able to decode the stack trace? It may be helpful
>>>> to figure out which line of code this is:
>>>>
>>>>    igc_update_stats+0x8a/0x6d0 [igc
>>>> 22e0a697bfd5a86bd5c20d279bfffd
>>>> 131de6bb32]
>>> Of course. Just tell me what to do.
>>>
>>> - Jesper
>>>
>>> On Thu, 12 Sept 2024 at 17:37, Jakub Kicinski <kuba@kernel.org> wrote:
>>>> On Thu, 12 Sep 2024 15:03:14 +0200 Jesper Juhl wrote:
>>>>> It just happened again.
>>>>> Same error message, but different stacktrace:
>>>> Hm, I wonder if it's power management related or the device just goes
>>>> sideways for other reasons. The crashes are in accessing statistics
>>>> and the relevant function doesn't resume the device. But then again,
>>>> it could just be that stats reading is the most common control path
>>>> operation.
>>>>
> I doubt it's related to power management since the machine is not idle
> when this happens.
>
>>>> Hopefully the Intel team can help.
>>>>
>>>> Would you be able to decode the stack trace? It may be helpful
>>>> to figure out which line of code this is:
>>>>
>>>>     igc_update_stats+0x8a/0x6d0 [igc
>>>> 22e0a697bfd5a86bd5c20d279bfffd131de6bb32]
> I didn't manage to decode it with the distro kernel. I'll build a
> custom kernel straight from the git repo and wait for the problem to
> happen again, then I'll report back with a decoded trace.
>
>> Hi Jasper,
>>
>> I agree with Kuba that it might be related to power management, and I
>> wonder if it can be related to PTM.
>> Anyway, can you please share the following information?
>>
>> 1. Is runtime D3 enabled? (you can check the value in
>> /sys/devices/pci:(pci SBDF)/power/control)
> $ cat /sys/devices/pci0000\:00/power/control
> auto
>
>> 2. What is the NVM version that your NIC has? (ethtool -i eno1)
> $ sudo ethtool -i eno1
> driver: igc
> version: 6.10.9-arch1-2
> firmware-version: 1082:8770
> expansion-rom-version:
> bus-info: 0000:0c:00.0
> supports-statistics: yes
> supports-test: yes
> supports-eeprom-access: yes
> supports-register-dump: yes
> supports-priv-flags: yes

I see that you have an old NVM version, 1.82.

In the recent versions, some power and stability bug fixes were 
introduced to the NVM.

These fixes in the NVM might resolve completely your issue.

Therefore, I'd like to ask you to contact your board vendor, Asus, to 
update the NVM to the latest version.

>> 3. Can you please elaborate on you bug?
>> Does it happen while the system is in idle state?
> I don't know. It might, but I've only ever observed it while actively
> using the machine. I usually notice the problem when watching a
> youtube video or playing an online game and suddenly the network
> connection dies.
>
>> Does it run any
>> traffic?
> Yes, there's usually always network traffic when the problem occurs.
>
>> What is the system's link partner (switch? other NIC?)
> It's a "tp-link" switch: TL-SG105-M2 5-Port 2.5G Multi-Gigabit Desktop Switch
>
> Kind regards
>   Jesper Juhl