linux-kernel - Re: 2.6.19-rc1 genirq causes either boot hang or "do

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Date:	Fri, 6 Oct 2006 15:53:19 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	Muli Ben-Yehuda <muli@...ibm.com>,
	David Howells <dhowells@...hat.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rajesh Shah <rajesh.shah@...el.com>, Andi Kleen <ak@....de>,
	"Protasevich, Natalie" <Natalie.Protasevich@...SYS.com>,
	"Luck, Tony" <tony.luck@...el.com>, Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Badari Pulavarty <pbadari@...il.com>
Subject: Re: 2.6.19-rc1 genirq causes either boot hang or "do_IRQ: cannot handle IRQ -1"

On Fri, Oct 06, 2006 at 06:20:54PM +0200, Muli Ben-Yehuda wrote:
> On Fri, Oct 06, 2006 at 05:50:21PM +0200, Muli Ben-Yehuda wrote:
> 
> > > What happens if you boot with max_cpus=1?
> > 
> > Trying it now... woohoo, it boots all the way and stays up!
> 
> Ok, after verifying that maxcpus=1 causes the problematic changeset to
> boot, I also tried maxcpus=1 with the tip of the tree. I hit this NULL
> pointer dereference in profile_tick, with and without
> maxcpus=1. Disassembly says that get_irq_regs() is returning NULL,
> which may or may not be related to the genirq issue.

I ran into this as well and managed to bisect it to the following commit:

7d12e780e003f93433d49ce78cfedf4b4c52adc5 is first bad commit
commit 7d12e780e003f93433d49ce78cfedf4b4c52adc5
Author: David Howells <dhowells@...hat.com>
Date:   Thu Oct 5 14:55:46 2006 +0100

    IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
...

		-ben
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