linux-kernel - Re: bug seen with dynticks from CONFIG_HARDIRQS_SW

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Message-Id: <1179396659.3764.40.camel@chaos>
Date:	Thu, 17 May 2007 12:10:59 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Woodruff, Richard" <r-woodruff2@...com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: bug seen with dynticks from CONFIG_HARDIRQS_SW_RESEND

On Wed, 2007-05-16 at 18:20 -0500, Woodruff, Richard wrote:
> The crashes were because the frame pointer per_cpu____irq_regs value was
> 0.  That code does a user_mode(get_irq_regs()).  Currently regs is set
> only upon real hardware entry on an irq.
> 
> The crash path shows resend_irqs() could be called with in a context
> where set_irq_regs() was not executed.  In one specific case this was
> from
> softirq->tasklet_action(resend_tasklet)->resend_irqs->handle_level_irq->
> handle_IRQ_event->...->profile_tick.
> 
> It seems anyone calling kernel/irq/manage.c:enable_irq() at the wrong
> time can trigger this crash.

which code is disabling / enabling the timer interrupt ?

	tglx


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