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

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Date:   Tue, 14 Jul 2020 16:11:35 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Stephen Berman <stephen.berman@....net>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>
Subject: Re: power-off delay/hang due to commit 6d25be57 (mainline)

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@...utronix.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.

Rafael, are you also interested in an ACPI dump?

> Cheers!

Sebastian

View attachment "acpi_dbg.patch" of type "text/x-diff" (4075 bytes)