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

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Date:   Mon, 15 May 2023 20:09:49 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Hans de Goede <hdegoede@...hat.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?)

On 5/15/23 15:56, Hans de Goede wrote:
> 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.
> 

OK, thanks for the fixup!

#regzbot fix: wifi: brcmfmac: Check for probe() id argument being NULL

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