On Wed, 16 Sep 2015, Steven Rostedt wrote:
> On Wed, 16 Sep 2015 22:01:06 +0200 (CEST)
> Thomas Gleixner <t...@linutronix.de> wrote:
> > So now I have to chase down that one:
> >
> > [ 0.230210] ftrace: allocating 16560 entries in 49 pages
> > [ 0.273313] ------------[ cut here ]------------
> > [ 0.278048] WARNING: at
> > /home/tglx/work/kernel/tip/tip/kernel/trace/ftrace.c:1974
>
> OK, so this is where ftrace converts the mcount to nops.
>
> Just to be clear, there's nothing in the command line that enables any
> function tracing, is there?
Nothing on the command line.
> > Happens somewhere between the powerpc merge and rc1. System boots up
> > to userspace and then locks hard ....
Digging deeper. My assumption that it's a post powerpc merge failure
turned out to be wrong.
Some more data points. I see the above splat with
CONFIG_FUNCTION_TRACER=y
CONFIG_FUNCTION_GRAPH_TRACER=y
It goes away with
CONFIG_FUNCTION_TRACER=y
CONFIG_FUNCTION_GRAPH_TRACER=n
But the box still does not get to the login prompt.
CONFIG_FUNCTION_TRACER=n
makes it work again.
It's not observable before the ppc merge, but I can't identify the
culprit by bisection. bisection led into lala land.
Thanks,
tglx
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