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

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Message-ID: <1291679699.6246.11.camel@Tobias-Karnat>
Date:	Tue, 07 Dec 2010 00:54:59 +0100
From:	Tobias Karnat <tobias.karnat@...glemail.com>
To:	Bjorn Helgaas <bjorn.helgaas@...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

Am Montag, den 06.12.2010, 16:26 -0700 schrieb Bjorn Helgaas:
> On Monday, December 06, 2010 04:01:43 pm Tobias Karnat wrote:
> > No, it only crashes on boot (without the printk patch).
> > If it happens the machine is completely dead, SysRq does not work.
> > 
> > However it is definitely the acpi_button module, because removing it
> > also fixes this.
> 
> If it crashes on boot (not when loading an acpi_button module),
> you must be building acpi_button into the static kernel.

It does crash on boot either if built-in to the kernel or as a module,
However it does not crash if the module is loaded/unloaded after the
machine has booted.

> The acpi_button driver has a fairly complicated add() method.
> In the absence of a better idea, I might just comment out blocks
> of it and try to isolate the problem.  For example, take out
> all the input stuff, take out the wakeup GPE stuff, take out
> the type/name setup, etc.

Couldn't this be a compiler issue?
Adding some printk's to fix it seems to be insane.

-Tobias

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