linux-kernel - Re: 2.6.21-rc2-mm2

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Date:	Thu, 8 Mar 2007 17:41:30 +0900
From:	"Magnus Damm" <magnus.damm@...il.com>
To:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-rc2-mm2

On 3/6/07, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
>
> Following panic ouccurred (always) on ia64/NUMA(with empty node.)
>
> Bug in here.
> ==
> void move_native_irq(int irq)
> {
>         struct irq_desc *desc = irq_desc + irq;
>
>         if (likely(!(desc->status & IRQ_MOVE_PENDING)))
>                 return;
>
>         if (unlikely(desc->status & IRQ_DISABLED))
>                 return;
>
>         desc->chip->mask(irq);  <---------maybe this *mask* is NULL pointer
>         move_masked_irq(irq);
>         desc->chip->unmask(irq);
> }
> ==
>
> Is "mask"  always valid pointer ?

Not last time I checked. Have a look at "no_irq_chip" in
linux/kernel/irq/handle.c.

Your problem looks somewhat similar to the problem I had with irq
migration on ia64:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=29a002776ba5ef170446910b1f93c480cdd43706

/ magnus
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