linux-kernel - Re: Oops in trace_hardirqs

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Date:	Sun, 19 Dec 2010 14:27:05 +0100
From:	Jörg Sommer <joerg@...a.gnuu.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: Oops in trace_hardirqs_on (powerpc)

Hi Steven,

Steven Rostedt hat am Mon 27. Sep, 21:58 (-0400) geschrieben:
> On Mon, 2010-09-27 at 14:50 +0200, Jörg Sommer wrote:
> > Hello Steven,
> > 
> > Steven Rostedt hat am Wed 22. Sep, 15:44 (-0400) geschrieben:
> > > Sorry for the late reply, but I was on vacation when you sent this, and
> > > I missed it while going through email.
> > > 
> > > Do you still have this issue?
> > 
> > No. I've rebuild my kernel without TRACE_IRQFLAGS and the problem
> > vanished, as expected. The problem is, that in some cases the stack is
> > only two frames deep, which causes the macro CALLER_ADDR1 makes an
> > invalid access. Someone told me, there a workaround for the problem on
> > i386, too.
> > 
> > % sed -n 2p arch/x86/lib/thunk_32.S
> >  * Trampoline to trace irqs off. (otherwise CALLER_ADDR1 might crash)
> 
> Yes, I remember that problem. When I get back from Tokyo, I'll tried to
> remember to fix it.

Did you've fixed this problem? The bug report is still marked as open.
https://bugzilla.kernel.org/show_bug.cgi?id=16573

Regards, Jörg.
-- 
Begebenheit aus dem wahren Leben:
Mediziner: ICEs sind die weißen Züge.
Mathematiker: Das ist falsch. Jeder ICE ist zwar weiß, aber nicht alle
  weißen Züge sind ICEs.

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