linux-kernel - Suspend/resume with FTRACE enabled doesn’t work anymore

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Date:   Wed, 17 Jan 2018 15:20:42 +0100
From:   Paul Menzel <pmenzel+linux-ftrace@...gen.mpg.de>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, regression@...mhuis.info,
        Mario Limonciello <mario.limonciello@...l.com>,
        Len Brown <len.brown@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Suspend/resume with FTRACE enabled doesn’t work anymore

Dear Linux folks and Dell XPS 13 9360 users,

Testing Linux 4.15-rc8 on a Lenovo T60 (32 bit) and Dell XPS 13 9360 (64 
bit) suspend to and resume from ACPI S3 doesn’t work anymore. 
`./sleepgraph.py -config config/suspend-callgraph.cfg` [1] is used to 
enable the FTRACE framework.

On the Lenovo T60 the system seems to enter ACPI S3 state just fine, but 
doesn’t wake up.

On the Dell XPS 13 9360 the system doesn’t enter ACPI S3 and just 
freezes with the display still on, and the messages below.

```
[…]
INITIALIZING FTRACE...
Setting trace buffers to 3145728 kB (786432 kB per cpu)
```

Please find the configuration file used for the Lenovo T60 attached.

Kind regards,

Paul

[1] https://01.org/suspendresume

View attachment "linux_4.15-rc8–config.txt" of type "text/plain" (194641 bytes)

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