netdev - Re: Fwd: Freeze after resuming from hibernation (culprit is brcmfmac change?)

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Date: Mon, 15 May 2023 10:56:57 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Bagas Sanjaya <bagasdotme@...il.com>,
 Linux Regressions <regressions@...ts.linux.dev>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Linux Wireless <linux-wireless@...r.kernel.org>,
 Broadcom 80211 Devices <brcm80211-dev-list.pdl@...adcom.com>,
 SHA cyfmac Subsystem <SHA-cyfmac-dev-list@...ineon.com>,
 Linux Kernel Network Developers <netdev@...r.kernel.org>
Cc: Hante Meuleman <hante.meuleman@...adcom.com>,
 Pieter-Paul Giesberts <pieter-paul.giesberts@...adcom.com>,
 Franky Lin <franky.lin@...adcom.com>,
 Arend van Spriel <arend.vanspriel@...adcom.com>,
 Kalle Valo <kvalo@...nel.org>, julien.falque@...il.com
Subject: Re: Fwd: Freeze after resuming from hibernation (culprit is brcmfmac
 change?)

Hi,

On 5/15/23 04:21, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on bugzilla [1]. Quoting from it:
> 
>>  julien.falque@...il.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
>