Re: [PATCH 7/7] sparc64: Add function graph tracer support.

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From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Date: Wed, 14 Apr 2010 17:48:04 +0200

> Ok, I've applied the two patches and it fixes the problems
> partially.
> 
> The crashes happen less likely as run into a manual
> loop of
> 
> 	echo function_graph > current_tracer
> 	echo nop > current_tracer
> 
> But after some trials:

Thanks for testing, I still get weird crashes too during stress tests.

At this point I think either we're still getting stack overflow due to
deep call chains, or something that is supposed to be NMI safe
actually isn't :-)

Validating the stack overflow theory is pretty simple so I'll do some
tests tonight to check that out.
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