linux-kernel - Re: acpi_button: random oops on boot

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Message-Id: <201012060928.11307.bjorn.helgaas@hp.com>
Date:	Mon, 6 Dec 2010 09:28:11 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Tobias Karnat <tobias.karnat@...glemail.com>
Cc:	linux-acpi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	richard.coe@....ge.com, jslaby@...ell.com
Subject: Re: acpi_button: random oops on boot

On Saturday, December 04, 2010 08:49:12 am Tobias Karnat wrote:
> I have a problem with random oopses on boot,
> every 1 out of 5 times I boot linux freezes.
> 
> I was not able to obtain a call trace, however it happens around 10-15
> seconds after boot. I can hear that the tg3 driver is initialised.
> 
> In this thread, they have the same problem:
> https://bugzilla.novell.com/show_bug.cgi?id=647029

Wow, that's a nasty problem.

> Applying the patch from the thread, makes the problem occurring less
> often and dmesg shows acpi-button loads for me on hid PNP0C0C and
> LNXPWRBN.
> 
> Maybe commit e2fb9754d27513918a4936e8cbaad50ff56cfd3d
> ACPI: button: remove unnecessary null pointer checks
> has unmasked an underlying problem?

The oopses from the bugzilla are not the sort I would expect from
a null pointer dereference, but since it's fairly reproducible for
you, it might be worth reverting e2fb9754d27 to see whether it makes
any difference.

Does Rich's script from https://bugzilla.novell.com/show_bug.cgi?id=647029#c30
help you reproduce the problem?

Bjorn
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