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

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Message-ID: <20180117111031.69f46195@gandalf.local.home>
Date:   Wed, 17 Jan 2018 11:10:31 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Paul Menzel <pmenzel+linux-ftrace@...gen.mpg.de>
Cc:     Ingo Molnar <mingo@...nel.org>, 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: Re: Suspend/resume with FTRACE enabled doesn’t
 work anymore

On Wed, 17 Jan 2018 15:20:42 +0100
Paul Menzel <pmenzel+linux-ftrace@...gen.mpg.de> wrote:

> 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)
> ```


It's been fixed, and the the patch is in Linus's tree already:

 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0e3a18f4baf8e3754ac1e56f0ade924d0c0c721

-- Steve