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

[Rafael J. Wysocki]

On 10/10/2015 12:52 AM, Al Stone wrote:
> 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...

Please send it to linux-acpi@xxxxxxxxxxxxxxxx

Thanks,
Rafael

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