linux-kernel - Re: [Regression][BISECTED] kernel boot hang after 19898ce9cf8a ("wifi: iwlwifi: split 22000.c into multiple files")

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Message-ID: <b4063a55-be7c-8f3a-2529-e1211080d323@lwfinger.net>
Date:   Sun, 9 Jul 2023 11:28:02 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     "Zhang, Rui" <rui.zhang@...el.com>,
        "Greenman, Gregory" <gregory.greenman@...el.com>,
        "Berg, Johannes" <johannes.berg@...el.com>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Cc:     "bagasdotme@...il.com" <bagasdotme@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kvalo@...nel.org" <kvalo@...nel.org>,
        "Baruch, Yaara" <yaara.baruch@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "Torvalds, Linus" <torvalds@...ux-foundation.org>,
        "Ben Ami, Golan" <golan.ben.ami@...el.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "Sisodiya, Mukesh" <mukesh.sisodiya@...el.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>
Subject: Re: [Regression][BISECTED] kernel boot hang after 19898ce9cf8a
 ("wifi: iwlwifi: split 22000.c into multiple files")

On 7/9/23 08:27, Zhang, Rui wrote:
> On Sat, 2023-07-08 at 16:17 +0200, Thorsten Leemhuis wrote:
>> On 07.07.23 12:55, Linux regression tracking (Thorsten Leemhuis)
>> wrote:
>>> On 07.07.23 10:25, Zhang, Rui wrote:
>>>>
>>>> I run into a NULL pointer dereference and kernel boot hang after
>>>> switching to latest upstream kernel, and git bisect shows that
>>>> below
>>>> commit is the first offending commit, and I have confirmed that
>>>> commit
>>>> 19898ce9cf8a has the issue while 19898ce9cf8a~1 does not.
>>>
>>> FWIW, this is the fourth such report about this that I'm aware of.
>>>
>>> The first is this one (with two affected users afaics):
>>> https://bugzilla.kernel.org/show_bug.cgi?id=217622
>>>
>>> The second is this one:
>>> https://lore.kernel.org/all/CAAJw_Zug6VCS5ZqTWaFSr9sd85k%3DtyPm9DEE%2BmV%3DAKoECZM%2BsQ@mail.gmail.com/
>>>
>>> The third:
>>> https://lore.kernel.org/all/9274d9bd3d080a457649ff5addcc1726f08ef5b2.camel@xry111.site/
>>>
>>> And in the past few days two people from Fedora land talked to me
>>> on IRC
>>> with problems that in retrospective might be caused by this as
>>> well.
>>
>> I got confirmation: one of those cases is also caused by 19898ce9cf8a
>> But I write for a different reason:
>>
>> Larry (now CCed) looked at the culprit and spotted something that
>> looked
>> suspicious to him; he posted a patch and looks for testers:
>> https://lore.kernel.org/all/0068af47-e475-7e8d-e476-c374e90dff5f@lwfinger.net/
> 
> I applied this patch but the problem still exists.
> 
> thanks,
> rui

Rui,

I am not surprised that the patch did not help. I guess you will need to stay 
with kernel 6.3.X until the Intel developers return from their summer break.

Larry