linux-kernel - Re: [lkp] [ACPI] 7494b07eba: Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 0

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Date:	Fri, 9 Oct 2015 16:52:38 -0600
From:	Al Stone <al.stone@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Hanjun Guo <hanjun.guo@...aro.org>,
	kernel test robot <ying.huang@...ux.intel.com>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [lkp] [ACPI] 7494b07eba: Kernel panic - not syncing: Watchdog
 detected hard LOCKUP on cpu 0

On 10/09/2015 03:02 PM, Rafael J. Wysocki wrote:
> On Thursday, October 08, 2015 05:05:00 PM Al Stone wrote:
>> On 10/08/2015 04:50 PM, Rafael J. Wysocki wrote:
>>> On Thursday, October 08, 2015 02:32:15 PM Al Stone wrote:
>>>> On 10/08/2015 02:41 PM, Rafael J. Wysocki wrote:
>>>>> On Thursday, October 08, 2015 10:37:55 PM Rafael J. Wysocki wrote:
>>>>>> On Thursday, October 08, 2015 10:36:40 AM Al Stone wrote:
>>>>>>> On 10/08/2015 05:44 AM, Hanjun Guo wrote:
>>>>>>>> On 10/08/2015 11:21 AM, kernel test robot wrote:
>>>>>>>>> FYI, we noticed the below changes on
>>>>>>>>>
>>>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
>>>>>>>>> commit 7494b07ebaae2117629024369365f7be7adc16c3 ("ACPI: add in a
>>>>>>>>> bad_madt_entry() function to eventually replace the macro")
>>>>>>>>>
>>>>>>>>> [    0.000000] ACPI: undefined MADT subtable type for FADT 4.0: 127 (length 12)
[snip....]

>> In the meantime, I'll poke the spec folks on the use of reserved subtable IDs
>> in the MADT and see what the consensus is there.  It may just be a matter of
>> clarifying the language in the spec.
> 
> One additional question to ask is what checks have been present in the OSes
> and what they do if they see a reserved MADT subtable ID.  If they haven't been
> doing anything so far, I'm afraid this particular train may be gone already.

It may be gone.  The silence so far is deafening :).

>> It's also on my plate to really dig into an ACPI test suite and see about
>> building something really robust for that -- this can be added as an example.
>> I'll see if I have time to send in a patch for FWTS, too, which is pretty
>> good about capturing such things.
> 
> Sounds good!
> 
> Thanks,
> Rafael
> 

Let me know if I need to send the patch to fix the regression elsewhere; it
dawned on me long after I sent it that this may not be the right place for it
to go...

-- 
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Linaro Enterprise Group
al.stone@...aro.org
-----------------------------------
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