linux-kernel - Re: 2.6.21-rc2-mm2

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Date:	Tue, 06 Mar 2007 15:47:13 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, john stultz <johnstul@...ibm.com>
Subject: Re: 2.6.21-rc2-mm2

On Wed, 2007-03-07 at 00:24 +1100, Con Kolivas wrote:
> >         printk(KERN_INFO "Time: %s clocksource has been installed.\n",
> >                clock->name);
> > }
> >
> > So clock seems to be NULL, but was accessed before
> > clocksource_calculate_interval() as well.
> 
> It seems to be specifically tripping at c->mult after reading c->shift if I'm 
> reading it correctly.
> 
> Note again, this is qemu, not real hardware and it will likely be giving very 
> unrealistic values for timer calibrations.

I know, but this does not really explain why the 

	tmp += c->mult/2;

results in a NULL pointer access after 

	tmp <<= c->shift;

Does disassembling the code in question give some info ? You might also
try to look with GDB at it.

	tglx


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