linux-kernel - Re: [regression] suspend stress test stalls within 30 minutes

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Date: Tue, 21 May 2024 21:52:59 -0400
From: Len Brown <lenb@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Kalle Valo <kvalo@...nel.org>, Dave Hansen <dave.hansen@...el.com>, 
	Borislav Petkov <bp@...en8.de>, Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, regressions@...ts.linux.dev, 
	Jeff Johnson <quic_jjohnson@...cinc.com>
Subject: Re: [regression] suspend stress test stalls within 30 minutes

On Fri, May 17, 2024 at 3:00 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> > [  449.061525] rtcwake test 31
> > [  449.176854] PM: suspend entry (deep)
> > [  449.179072] Filesystems sync: 0.002 seconds
>
> This means that ksys_sync_helper() has run, so it blocks somewhere in
> enter_state() around suspend_prepare().
>
> Can please echo 1 (as root) to /sys/power/pm_debug_messages and retest?
>
> This should allow us to see more in the log.

also, it would be interesting if you can reproduce with "rtcwake -m
freeze" rather than "-m mem".

For we have a NUC8 like this in our lab, and we gave up on running
ACPI S3 on it a few years ago
because the BIOS just was never that good at ACPI S3.  However, it has
been running freeze/s2idle
like a champ, thousands of cycles per week, for years.

Len Brown, Intel