netdev - Re: [Regression] Bug 216711 - null SSID reported by systemd-networkd when connected to a WPA3 network

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Date:   Thu, 1 Dec 2022 15:49:28 +0100
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Johannes Berg <johannes.berg@...el.com>
Cc:     Zoddo <kernel+bugzilla@...do.fr>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [Regression] Bug 216711 - null SSID reported by systemd-networkd
 when connected to a WPA3 network

[CCing the network maintainers]

Hi, this is your Linux kernel regression tracker. Top-posting for once,
to make this easily accessible to everyone.

Johannes, sorry to bother you, but I have to ask what's up there? Has
there any progress been made wrt to below regression? I'm wondering, as
I forwarded this ten days ago and haven't seen a single reply, but maybe
I missed something.

BTW, in between a second user who's affected by the regression showed up
in the bugzilla ticket.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.

On 21.11.22 09:32, Thorsten Leemhuis wrote:
> Hi, this is your Linux kernel regression tracker speaking.
> 
> I noticed a regression report in bugzilla.kernel.org. As many (most?)
> kernel developer don't keep an eye on it, I decided to forward it by
> mail. Quoting from https://bugzilla.kernel.org/show_bug.cgi?id=216711 :
> 
>>  Zoddo 2022-11-19 15:36:02 UTC
>>
>> Created attachment 303236 [details]
>> Bisect log
>>
>> Starting with linux 5.19.2, systemd-networkd reports a "(null)" SSID when connected to WPA3 network.
>>
>> Steps to reproduce:
>> 1. Get a system with systemd-networkd (maybe this issue can be exhibited with other methods, but using systemd-netword is the only one I know; I haven't found how to get this data directly from the kernel)
>> 2. Connect to a wireless network using WPA3.
>> 3. Run "networkctl status <wlan interface>", and observe that "WiFi access point" shows "(null)" instead of the network's SSID.
>> 4. If you try again with a WPA2 network, the SSID is shown as expected. WPA3 network also behaves as expected on kernel <=5.19.1
>>
>> This bug also affects linux 6.0 (tested on 6.0.8).
>>
>>
>> Bisection identified the following commit as the culprit:
>> (full bisect log attached)
>>
>> 7a53ad13c09150076b7ddde96c2dfc5622c90b45 is the first bad commit
>> commit 7a53ad13c09150076b7ddde96c2dfc5622c90b45
>> Author: Johannes Berg <johannes.berg@...el.com>
>> Date:   Thu Apr 14 16:50:57 2022 +0200
>>
>>     wifi: cfg80211: do some rework towards MLO link APIs
>>     
>>     [ Upstream commit 7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 ]
>>     
>>     In order to support multi-link operation with multiple links,
>>     start adding some APIs. The notable addition here is to have
>>     the link ID in a new nl80211 attribute, that will be used to
>>     differentiate the links in many nl80211 operations.
> 
> 
> See the ticket for more details.
> 
> BTW, let me use this mail to also add the report to the list of tracked
> regressions to ensure it's doesn't fall through the cracks:
> 
> #regzbot introduced: 7b0a0e3c3a882
> https://bugzilla.kernel.org/show_bug.cgi?id=216711
> #regzbot ignore-activity
> 
> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
> 
> P.S.: As the Linux kernel's regression tracker I deal with a lot of
> reports and sometimes miss something important when writing mails like
> this. If that's the case here, don't hesitate to tell me in a public
> reply, it's in everyone's interest to set the public record straight.