linux-kernel - Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

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Message-ID: <20080820105035.49f29509@zod.rchland.ibm.com>
Date:	Wed, 20 Aug 2008 10:50:35 -0400
From:	Josh Boyer <jwboyer@...ux.vnet.ibm.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Eran Liberty <liberty@...ricom.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Steven Rostedt <srostedt@...hat.com>,
	Alan Modra <amodra@....ibm.com>,
	Scott Wood <scottwood@...escale.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	segher@...nel.crashing.org
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)

On Wed, 20 Aug 2008 10:22:49 -0400 (EDT)
Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> On Wed, 20 Aug 2008, Josh Boyer wrote:
> > 
> > Segher was looking at this a bit this morning.  He thinks it's really
> > -fno-omit-frame-pointer that is causing this.  That really shouldn't
> > even be set on PowerPC, but FTRACE uses select which overrides the
> > depends on stuff in Kconfig.
> 
> I can easily make a patch that makes that select an x86 only.

That's probably a first step, but you might want to wait until Segher
can fill in more details.  I'm sort of just relaying what he and I were
talking about on IRC.  IIRC, he was testing builds with and without
both -pg and -fno-omit-frame-pointer and found the bug only when
-fno-omit-frame-pointer was present.

josh
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