linux-kernel - Re: [rt-devel:linux-6.2.y-rt-rebase] [printk] 5342b8e20b: hwsim.ap_ft_eap

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Date:   Mon, 30 Jan 2023 10:02:45 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Oliver Sang <oliver.sang@...el.com>
Cc:     oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
        John Ogness <john.ogness@...utronix.de>
Subject: Re: [rt-devel:linux-6.2.y-rt-rebase] [printk]  5342b8e20b:
 hwsim.ap_ft_eap_cui.fail

On 2023-01-28 09:45:57 [+0800], Oliver Sang wrote:
> hi Sebastian,
Hi Oliver,

> we rebuilt the kernel for both this commit and its parent, and make sure the
> config are same for both (as attached, actually also same to the config we used
> in last tests for oiginal report), then rerun the tests more times, but the
> issue seems still persistent
> 
> d144a18b3d136079 5342b8e20b15e5fb37e49de2435
> ---------------- ---------------------------
>        fail:runs  %reproduction    fail:runs
>            |             |             |
>            :20         100%          20:20    hwsim.ap_ft_eap_cui.fail
>            :20         100%          20:20    hwsim.ap_ft_many.fail
>            :20         100%          20:20    hwsim.ap_ft_pmf_bip_cmac_128.fail
> 
> attached one dmesg for this commit and another for parent FYI.

|  wlan0: send auth to 02:00:00:00:03:00 (try 1/3)
| +wlan0: send auth to 02:00:00:00:03:00 (try 2/3)
| +wlan0: send auth to 02:00:00:00:03:00 (try 3/3)
|  wlan0: authenticated
|  wlan0: associate with 02:00:00:00:03:00 (try 1/3)
| -wlan0: RX ReassocResp from 02:00:00:00:03:00 (capab=0x411 status=0 aid=1)
…
| -wlan0: associated
…
| +wlan0: RX ReassocResp from 02:00:00:00:03:00 (capab=0x411 status=55 aid=1)
| +wlan0: 02:00:00:00:03:00 denied association (code=55)

It is hard to comprehend that the printk change broke wifi/ hwsim. Let
me add John to see what he thinks.

> BTW, we noticed PREEMPT_RT is mentioned in commit message, but we didn't enable
> it in our config, not sure if this is relevant?

These printk changes are kind of staged for upstream inclusion. "kind
of" because John is reworking them. So either I broke something while
rebasing them or the timing changed and this pops up. The 6.1 series had
mostly the same printk code. This should work independent of PREEMPT_RT.

Sebastian