Re: [3.4-rc3] Thread overran stack, or stack corrupted

From: Steven Rostedt
Date: Tue Apr 17 2012 - 23:57:27 EST

On Tue, 2012-04-17 at 23:50 -0400, Dave Jones wrote:

> > Just to make sure, what does
> >
> > /sys/kernel/debug/tracing/enabled_functions
> >
> > have?
> 33503 lines.

That sounds correct.

> > This would show what functions the stack tracer is using.
> >
> > I just compiled the latest vanilla kernel and tried it out, and it
> > worked for me.
> works on my other machines too with similar kernel configs, just not on the one I'm profiling.

I have to ask. Is this a x86 box?

Also, have you tested to see if function tracing works?

# cd /sys/kernel/debug/tracing
# echo function > current_tracer
# cat trace

If function tracing doesn't work this wouldn't either.

I'm also assuming you have CONFIG_STACKTRACE and
CONFIG_STACKTRACE_SUPPORT enabled. They should be selected, but configs
can always get screwed up.

-- Steve

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