linux-kernel - Re: [2.6.27] early exception

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Message-Id: <1220431061.8609.87.camel@twins>
Date:	Wed, 03 Sep 2008 10:37:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Luca Tettamanti <kronos.it@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [2.6.27] early exception - lockdep related?

On Wed, 2008-09-03 at 10:28 +0200, Luca Tettamanti wrote:
> On Wed, Sep 3, 2008 at 8:52 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> > On Tue, 2008-09-02 at 23:06 +0200, Luca Tettamanti wrote:
> >> Hello,
> >> I'm seeing an early exception (0e) - which seems related to lockdep - at
> >> boot with many 2.6.27 kernels and I'm having troubles to track it down.
> >
> > Does it print one of these nice stack traces?
> 
> Of course not ;-) It dies before dumping the stack trace (or at least
> it doesn't make to the console - that machine has a serial port, but
> my notebook does not... I've ordered a usb-to-serial adapter).

Until it arrives, you could try poking at netconsole.. 

> >> The strange thing is that it comes and goes with different kernel
> >> versions
> >
> > What kernel version did you generate the below with - and what config.
> 
> -rc2 is working, after that it's intermittent. The last kernel that I
> tried is -git from a couple of days ago.

OK, once you send you .config, I'll try and reproduce on one of my
machine. Perhaps you can also provide the git-describe output of a known
bad one.

> >> , but a "bad" kernel consistently fails across reboots. It also
> >> seems to be sensitive to the configuration (attached)
> >
> > you seem to have forgotten that attachment.
> 
> Ops, will send as soon as I get home.

Sure thing..

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