linux-kernel - Re: Regression: ONE CPU fails bootup at Re: [3.2.0-RC7] BUG: unable to handle kernel NULL pointer dereference at 0000000000000598 1.478005] IP: [<ffffffff8107a6c4>] queue_work

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Message-ID: <1325702132.3037.100.camel@work-vm>
Date:	Wed, 04 Jan 2012 10:35:32 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Stefan Bader <stefan.bader@...onical.com>
Cc:	NeilBrown <neilb@...e.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Sander Eikelenboom <linux@...elenboom.it>, rjw@...k.pl,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Regression: ONE CPU fails bootup at Re: [3.2.0-RC7] BUG: unable
 to handle kernel NULL pointer dereference at 0000000000000598  1.478005]
 IP: [<ffffffff8107a6c4>] queue_work_on+0x4/0x30

On Wed, 2012-01-04 at 13:25 +0100, Stefan Bader wrote:
> Which may point to execution of the irq worker (including a schedule_work)
> before the rtc-cmos parts are finished... Would explain why moving the
> initialize call further down does at least narrow the window for it to happen...
> The only thing I do not understand then is why that seems only to happen on Xen
> guests...

Its just likely with Xen SMP guests that the race window is larger. I
suspect similar behavior could be tripped on other slower SMP boxes as
well.

thanks
-john


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