From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: [PATCH v2 12/12] ASoC: SOF: Intel: hda-codec: fix
	memory allocation
Date: Thu, 23 May 2019 10:27:09 +0200
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To: "Yang, Libin" <libin.yang@intel.com>
Cc: "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>, "broonie@kernel.org" <broonie@kernel.org>, Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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On Thu, 23 May 2019 10:21:20 +0200,
Yang, Libin wrote:
> 
> Hi Takashi,
> 
> >-----Original Message-----
> >From: Takashi Iwai [mailto:tiwai@suse.de]
> >Sent: Thursday, May 23, 2019 4:16 PM
> >To: Yang, Libin <libin.yang@intel.com>
> >Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>; alsa-
> >devel@alsa-project.org; broonie@kernel.org
> >Subject: Re: [alsa-devel] [PATCH v2 12/12] ASoC: SOF: Intel: hda-codec: fix
> >memory allocation
> >
> >On Thu, 23 May 2019 10:03:03 +0200,
> >Yang, Libin wrote:
> >>
> >> Please let me describe the issue here.
> >>
> >> The test case is:
> >> 1) Unload module with script "sudo ./sof_remove.sh" ,
> >> 2) reload module with script "sudo ./sof_insert.sh"
> >>
> >> After several rounds of removing and inserting kernel modules, system
> >> will complain like below:
> >> "BUG: unable to handle kernel paging request at 000000292a282031"
> >
> >Did you try some kernel debug options?  It might show what went wrong.
> 
> No, I haven't. I'm not sure which options I can use for this case. Could you
> please give me some suggestions?

You can enable CONFIG_DEBUG_DEVRES and adjust the devres.log option
for showing each devres allocation and removal.  And I'd try
CONFIG_DEBUG_SLAB and CONFIG_DEBUG_KMEMLEAK or whatever interesting in
CONFIG_DEBUG section, too.


Takashi