linux-kernel - Re: [PATCH 1/2] ftrace: disable tracing on resize

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Date:	Wed, 12 Nov 2008 19:03:24 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Pekka Paalanen <pq@....fi>
cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <srostedt@...hat.com>, fweisbec@...il.com
Subject: Re: [PATCH 1/2] ftrace: disable tracing on resize


On Wed, 12 Nov 2008, Pekka Paalanen wrote:

> On Mon, 10 Nov 2008 22:18:19 -0500 (EST)
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > 
> > Pekka,
> > 
> > I forgot to add you to the Cc list. Could you test this patch to see if it 
> > fixes the bug you reported. It fixed a bug I was able to reproduce, but I 
> > was never able to reproduce the exact same bug you have seen.
> 
> Thanks, Steve.
> 
> I didn't have time to try it myself yet, but a kind soul tried it for me.
> He used 2.6.28-rc4 and was immediately able to trigger the bug by just:
> cd /debug/tracing
> echo 0 > tracing_enabled
> echo 200 > trace_entries
> 
> Then he applied the patch you referred to, and the bug is still present.
> He has a 32-bit x86 amd system, and I'm on x86_64.
> 
> I don't know why you couldn't reproduce it, maybe you have all the tracers
> enabled in the kernel config, when we only have MMIOTRACE.

After disabling all other tracers, you are right. This sequence crashes.

I'll look into it, and I should have a patch sometime tonight.

-- Steve

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