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

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Message-ID: <8273a7755f90a3e41782f1d820dd9f0c22be78b7.camel@web.de>
Date: Thu, 27 Nov 2025 01:08:05 +0100
From: Bert Karwatzki <spasswolf@....de>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: 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>,
 spasswolf@....de
Subject: Re: Crash during resume of pcie bridge due to infinite loop in
 ACPICA

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.

Bert Karwatzki