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

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Message-ID: <alpine.DEB.1.10.0808201122260.23571@gandalf.stny.rr.com>
Date:	Wed, 20 Aug 2008 11:23:19 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jon Smirl <jonsmirl@...il.com>
cc:	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>
Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3)


On Wed, 20 Aug 2008, Jon Smirl wrote:
> > >
> > > > c00bb690:       bb 0b ff e0     lmw     r24,-32(r11)
> > > > c00bb694:       7c 08 03 a6     mtlr    r0
> > > > c00bb698:       4e 80 00 20     blr
> > > >
> > > >
> > >
> > > Yep, you have the same bug in your compiler.
> > >
> > > -- Steve
> > >
> > >
> >  Hmm... so whats now?
> >
> >  Is there a way to prove this scenario is indeed the one that caused the
> > opps?
> 
> Manually edit the broken binary to change the order of the restore and
> see if the problem disappears. That will keep everything else
> constant.

Does it only happen on this function? Or is it happening on others as 
well. So manually fixing it here won't help much unless we fix it 
everywhere.

-- Steve

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