linux-kernel - Re: Crash during resume of pcie bridge due to infinite loop in ACPICA

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Message-ID: <CAJZ5v0i2T7HpV4jN6NJk=ruBvjecPRU2PyuYf0_TSPQU6FZ5rg@mail.gmail.com>
Date: Thu, 27 Nov 2025 14:02:36 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Bert Karwatzki <spasswolf@....de>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Christian König <christian.koenig@....com>, 
	"Mario Limonciello (AMD) (kernel.org)" <superm1@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-next@...r.kernel.org, regressions@...ts.linux.dev, 
	linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org, 
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>, acpica-devel@...ts.linux.dev, 
	Robert Moore <robert.moore@...el.com>, Saket Dumbre <saket.dumbre@...el.com>
Subject: Re: Crash during resume of pcie bridge due to infinite loop in ACPICA

On Thu, Nov 27, 2025 at 1:08 AM Bert Karwatzki <spasswolf@....de> wrote:
>
> Am Dienstag, dem 25.11.2025 um 20:46 +0100 schrieb Rafael J. Wysocki:
> >
> >
> > What may be happening, but this is just a theory, is that the
> > interpreter aborts the evaluation of a method due to an internal
> > timeout, essentially the control_state->control.loop_timeout check in
> > acpi_ds_exec_end_control_op() and that leads to a subsequent hard
> > failure like a deadlock.
> >
> > This may be tested by increasing the ACPI_MAX_LOOP_TIMEOUT value, but
> > I'm not sure it's practical to try that.
>
> I don't think this the case here because ACPI_MAX_LOOP_TIMEOUT defaults to
> 30s and the walk loop until the crash only lasts ~2s.

I see, thanks!