linux-kernel - Re: REGRESSION WITH BISECT: v6.5-rc6 TPM patch breaks S3 on some Intel systems

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Date:   Thu, 17 Aug 2023 15:25:15 -0700
From:   Todd Brandt <todd.e.brandt@...ux.intel.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>, mario.limonciello@....com,
        linux-integrity@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, len.brown@...el.com,
        charles.d.prestopine@...el.com, rafael.j.wysocki@...el.com
Subject: Re: REGRESSION WITH BISECT: v6.5-rc6 TPM patch breaks S3 on some
 Intel systems

On Fri, 2023-08-18 at 00:47 +0300, Jarkko Sakkinen wrote:
> On Fri Aug 18, 2023 at 12:09 AM EEST, Todd Brandt wrote:
> > While testing S3 on 6.5.0-rc6 we've found that 5 systems are seeing
> > a
> > crash and reboot situation when S3 suspend is initiated. To
> > reproduce
> > it, this call is all that's required "sudo sleepgraph -m mem
> > -rtcwake
> > 15".
> 
> 1. Are there logs available?
> 2. Is this the test case: https://pypi.org/project/sleepgraph/ (never
> used it before).

There are no dmesg logs because the S3 crash wipes them out. Sleepgraph
isn't actually necessary to activate it, just an S3 suspend "echo mem >
/sys/power/state".

So far it appears to only have affected test systems, not production
hardware, and none of them have TPM chips, so I'm beginning to wonder
if this patch just inadvertently activated a bug somewhere else in the
kernel that happens to affect test hardware.

I'll continue to debug it, this isn't an emergency as so far I haven't
seen it in production hardware.

> 
> I'll see if I can repeat it with QEMU + swtpm.
> 
> > I’ve created a Bugzilla to track this issue here:
> > https://bugzilla.kernel.org/show_bug.cgi?id=217804
> 
> Thank you for reporting this.
> 
> BR, Jarkko