linux-kernel - Re: [BUG BISECT] NULL pointer after commit "ASoC: dapm: Only power up active channels from a DAI"

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Message-id: <844c3f34-f7db-6b26-169a-994922367c78@samsung.com>
Date:   Wed, 06 Feb 2019 10:46:50 +0100
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Cc:     linux-samsung-soc@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        ckeepax@...nsource.cirrus.com
Subject: Re: [BUG BISECT] NULL pointer after commit
 "ASoC: dapm: Only power up active channels from a DAI"

Hi Krzysztof,

Cc: Charles

On 2/5/19 22:16, Krzysztof Kozlowski wrote:
> Bisect pointed to commit:
>     commit 078a85f2806f0ffd11289009462a6a390f9adb5c
>     Author: Charles Keepax <ckeepax@...nsource.cirrus.com>
>     Date:   Thu Jan 31 13:30:18 2019 +0000
>         ASoC: dapm: Only power up active channels from a DAI
> 
> as a bad commit for NULL pointer on my Odroid XU3 and Odroid U3 board when
> doing "aplay /usr/share/sounds/alsa/Front_Right.wav".
> 
> 1. Arch ARM Linux
> 2. exynos_defconfig
> 3. Odroid U3, XU3, Exynos SoC, ARMv7
> 
> Last address is in calltrace:
> c079552c
> dapm_update_dai_unlocked
> sound/soc/soc-dapm.c:2586

Thanks for bisecting this, I ran into same issue last night and I'm starting
to debug this now. I have added some debug prints and it looks like it oopses
on NULL playback_widget of the dummy DAI.

[   30.701182] hdmi-audio-codec hdmi-audio-codec.0.auto: Update DAI routes for i2s-hifi playback
[   30.709630] dapm_update_dai_unlocked:2586 w=8bd27d28
[   30.714403] dapm_update_dai_unlocked:2594 w=8bd27d28
[   30.724688] max98090 5-0010: Update DAI routes for HiFi playback
[   30.730163] dapm_update_dai_unlocked:2586 w=3fc942af
[   30.735154] dapm_update_dai_unlocked:2594 w=3fc942af
[   30.745051] snd-soc-dummy snd-soc-dummy: Update DAI routes for snd-soc-dummy-dai playback
[   30.753128] dapm_update_dai_unlocked:2586 w=  (null)
[   30.758114] Unable to handle kernel NULL pointer dereference at virtual address 0000007c

-- 
Regards,
Sylwester