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Date: Wed, 22 Apr 2009 17:32:25 -0400 (EDT)
From: Steven Rostedt <rostedt@goodmis.org>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
cc: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Glauber de Oliveira Costa <gcosta@redhat.com>,
       Chris Wright <chrisw@sous-sol.org>,
       Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH 0/2] [GIT PULL] tracing: various bug fixes
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On Wed, 22 Apr 2009, Steven Rostedt wrote:

> 
> On Wed, 22 Apr 2009, Jeremy Fitzhardinge wrote:
> 
> > > 
> > >    
> > > > Do you have CONFIG_PARAVIRT on?  When I disabled it, I have yet to
> > > > reproduce the bug. But I've only rebooted a few times. I'm going to
> > > > continue to reboot to see if I can trigger it.
> > > >     
> > > 
> > > 
> > > Yes it is enabled.
> > > 
> > > 
> > > 
> > >   
> > > > I'm thinking that the paravirt alternative code may have clobbered a
> > > > register in either the enable or disabling of interrupts. This might cause
> > > > a strange value to go into the hardirqs_enabled flag.
> > > >     
> > > 
> > > 
> > > 
> > > Ok I will try it without PARAVIRT and tell you if I can reproduce it.
> > >   
> > 
> > Interesting.  What code is generated for native_irq_enable/disable?
> 
> Note, when I take my standard config and enable PARAVIRT and LOCKDEP it 
> still boots up fine. It may be a combination of some configs :-/
> 
> I'm currently doing a "config bisect" to find out what configs are needed.

I just finished the config bisect, and it came down to 
CONFIG_DEBUG_PAGEALLOC (set is bad, not set is good). I'm sure this is not 
the only config that is at issue. It is probably a combination of configs 
:-/

I'll try others to see if things change.

-- Steve