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Message-ID: <f629341e-5920-8061-6120-cb954d22ffe9@redhat.com>
Date:   Mon, 15 May 2023 10:56:57 +0200
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Subject: Re: Fwd: Freeze after resuming from hibernation (culprit is brcmfmac
 change?)
To:     Bagas Sanjaya <bagasdotme@gmail.com>,
        Linux Regressions <regressions@lists.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Wireless <linux-wireless@vger.kernel.org>,
        Broadcom 80211 Devices <brcm80211-dev-list.pdl@broadcom.com>,
        SHA cyfmac Subsystem <SHA-cyfmac-dev-list@infineon.com>,
        Linux Kernel Network Developers <netdev@vger.kernel.org>
Cc:     Hante Meuleman <hante.meuleman@broadcom.com>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Arend van Spriel <arend.vanspriel@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>, julien.falque@gmail.com
References: <018f62d0-ee1d-9198-9c38-e45b10921e2e@gmail.com>
Content-Language: en-US
From:   Hans de Goede <hdegoede@redhat.com>
In-Reply-To: <018f62d0-ee1d-9198-9c38-e45b10921e2e@gmail.com>
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Hi,

On 5/15/23 04:21, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on bugzilla [1]. Quoting from it:
> 
>>  julien.falque@gmail.com 2023-05-14 09:55:38 UTC
>>
>> Since a Kernel update a few weeks ago, my laptop freezes when resuming from hibernation. It seems to handle the resume process normally but at the moment I should see Gnome login screen, I either get a black screen with just a white underscore instead, or nothing displayed at all (no backlight). I can't do anything at that point and I have to hard reboot.
>>
>> Steps to reproduce:
>> - hibernate
>> - resume
>> - wait until the resuming process should finish: black screen instead of e.g. Gnome's login screen
>>
>> journalctl gives nothing between the beginning of the resume and the crash, as if it never happened.
>>
>> I have a Dell XPS 15 (9550) with Arch Linux. The issue happens on linux (since v6.2.0 I think) but linux-lts (currently v6.1.28) is fine.
>>
>> A bisect on linux-git gave commit da6d9c8ecd00 as the cause of the problem.
> 
> See bugzilla for the full thread.
> 
> Julien: I asked you to also provide dmesg log as I don't know
> what exactly happened, but you mentioned the culprit was
> da6d9c8ecd00e2 ("wifi: brcmfmac: add firmware vendor info in driver info"),
> which implies that the crash involves your wifi device. From my experience
> though, GDM crashes are usually caused by xwayland.
> 
> Anyway, I'm adding this to regzbot:
> 
> #regzbot introduced: da6d9c8ecd00e2 https://bugzilla.kernel.org/show_bug.cgi?id=217442
> #regzbot title: brcmfmac firmware vendor info addition triggers GDM crash on resuming from hibernation

da6d9c8ecd00e2 is known to cause a NULL pointer deref on resume,
which is likely what is happening here. This is fixed by:

https://lore.kernel.org/regressions/20230510141856.46532-1-hdegoede@redhat.com/

This patch is ready for merging and is waiting for the wireless-maintainer
to merge it and send it to Linus.

Regards,

Hans


> [1]: https://bugzilla.kernel.org/show_bug.cgi?id=217442
>