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

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Date:   Thu, 09 Mar 2017 21:43:47 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Kernel panic on Lenovo X60 with tracing enabled

On 2017-03-09 17:29, Steven Rostedt wrote:
> On Thu, 9 Mar 2017 10:16:02 -0600
> Josh Poimboeuf 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 wrote:

>> > > 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?

As far as I can see, the Debian Linux kernel is built with 
`CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y`.

So it might be a different problem?


Kind regards,

Paul