linux-kernel - Re: irq 16: nobody cared

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Date:	Sun, 21 Apr 2013 18:56:54 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
	tiwai@...e.de
Subject: Re: irq 16: nobody cared

On Sun, Apr 21, 2013 at 09:30:02AM -0700, Paul E. McKenney wrote:
> Thank you for the info!  Now to figure out what the heck is causing this.
> 
> I am also guessing that your system does have hardware that could do an
> irq 16.  Of course, if removing or disabing this hardware is an option,
> it would be interesting to see what happens.

Onboard sound chip so only BIOS disable should help, if present. Let me
check. Oh, I can take out the laser and cut it out of the silicon. :-)

What about not enabling any sound support and thus not using this IRQ
handler? Would that tell us something?

> Especially given that at the very bottom of the .jpg, there is a
> chopped-off line that appears to read "Disabling IRQ #16". Which of
> course leads me to wonder whether we hit a race between the last
> interrupt arriving and the device being disabled.

Well, the "Disabling IRQ..." line comes from note_interrupt() down the
do_IRQ() path. It looks like

	if (unlikely(desc->irqs_unhandled > 99900)) {

we hit some high number of unhandled interrupts, issue the message about
the bad IRQ and then disable it by dumping the handlers beforehand.

> Hmmm...  Do you have either CONFIG_PM_SLEEP, SUPPORT_VGA_SWITCHEROO,
> or CONFIG_PM_RUNTIME set for these runs?

CONFIG_PM_SLEEP=y
# CONFIG_VGA_SWITCHEROO is not set
# CONFIG_PM_RUNTIME is not set

You meant CONFIG_VGA_SWITCHEROO and not SUPPORT_VGA_SWITCHEROO, right?

Ok, let me try to disable the soundcard in the BIOS.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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