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

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Date:   Thu, 9 Mar 2017 11:29:36 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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, 9 Mar 2017 10:16:02 -0600
Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> 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.
> 

Paul, do you have CONFIG_CC_OPTIMIZE_FOR_SIZE enabled? Can you set it
to PERFORMANCE and see if the problem goes away?

-- Steve