Re: power-off delay/hang due to commit 6d25be57 (mainline)

[Stephen Berman <stephen.berman@gmx.net>]

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On Tue, 14 Jul 2020 16:11:35 +0200 Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:

> On 2020-07-14 15:54:57 [+0200], Rafael J. Wysocki wrote:
>> On Tue, Jul 14, 2020 at 3:44 PM Sebastian Andrzej Siewior
>> <bigeasy@linutronix.de> wrote:>
>> > On 2020-06-24 23:49:52 [+0200], Stephen Berman wrote:
>> >
>> > Let me summarize the thread here:
>> >
>> > On Stephen's system, ACPI informs the thermal zone driver to poll the
>> > temperature every second and the driver does so.
>> > The driver queries the temperature by invoking acpi_evaluate_integer()
>> > which invokes (at some point) acpi_ev_queue_notify_request().
>>
>> Well, I don't quite see how acpi_ev_queue_notify_request() can be
>> invoked from the acpi_evaluate_integer() code path.
>>
>> Do you have a call trace showing that?
>
> So the trace in
>      https://lore.kernel.org/linux-acpi/87o8pjh1i0.fsf@gmx.net/
>
> shows the pattern and we nailed it down that it comes from
> thermal_get_temp(). I assumed acpi_ex_opcode_2A_0T_0R() since the other
> candidate was acpi_ev_asynch_execute_gpe_method().
>
> Stephen, the patch attached adds a WARN_ON() statement which will
> produce a stack trace (4 or so). Could please run 'dmesg' after a while
> and send it back. There should be a
>     "WARNING in drivers/acpi/acpica/evmisc.c"
>
> statement or something along the lines.

I've now rebuilt 5.6.4 with the new patch; sorry for the delay.  Output
of dmesg attached.

Steve Berman


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