linux-kernel - Re: Kernel panic on Lenovo X60 with tracing enabled

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Message-ID: <20170309161602.blwj36l6ckg3yh5g@treble>
Date:   Thu, 9 Mar 2017 10:16:02 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Kernel panic on Lenovo X60 with tracing enabled

On Thu, Mar 09, 2017 at 09:36:30AM -0500, Steven Rostedt wrote:
> On Thu, 9 Mar 2017 13:12:28 +0100
> Paul Menzel <pmenzel@...gen.mpg.de> wrote:
> 
> > Dear Steven, dear Ingo,
> > 
> > 
> > Hopefully, I am contacting the right people for my issue.
> > 
> > Suspending a system with Linux 4.9.13 with tracing enabled, it fails 
> > with the screen still enabled, and the LED blinking. Attaching a serial 
> > console to the dock, shows the messages below.
> 
> I'm betting this is a compiler bug, as that bug that printed is the
> internal ftrace check for it. (note the bug is only in x86-32 not
> x86-64)
> 
> Funny, we are just talking about this bug in another thread, but with a
> different symptom.
> 
> Josh, did you say this goes away if you disable optimize for size or
> does it need to be enabled?

Yeah, assuming it's the same problem, then this is caused by
CONFIG_CC_OPTIMIZE_FOR_SIZE.  It would be fixed by changing it to
CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE.

-- 
Josh