linux-kernel - Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp

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Message-ID: <20201014190226.GE4580@sirena.org.uk>
Date:   Wed, 14 Oct 2020 20:02:26 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, cujomalainey@...omium.org,
        Łukasz Majczak <lmajczak@...gle.com>
Subject: Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup
 function

On Wed, Oct 14, 2020 at 02:16:24PM +0000, Tomasz Figa wrote:

> Fixes a boot crash on a HP Chromebook x2:
> 
> [   16.582225] BUG: kernel NULL pointer dereference, address: 0000000000000050
> [   16.582231] #PF: supervisor read access in kernel mode
> [   16.582233] #PF: error_code(0x0000) - not-present page
> [   16.582234] PGD 0 P4D 0
> [   16.582238] Oops: 0000 [#1] PREEMPT SMP PTI
> [   16.582241] CPU: 0 PID: 1980 Comm: cras Tainted: G         C        5.4.58 #1
> [   16.582243] Hardware name: HP Soraka/Soraka, BIOS Google_Soraka.10431.75.0 08/30/2018

Please think hard before including complete backtraces in upstream
reports, they are very large and contain almost no useful information
relative to their size so often obscure the relevant content in your
message. If part of the backtrace is usefully illustrative (it often is
for search engines if nothing else) then it's usually better to pull out
the relevant sections.

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