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Date: Tue, 5 Jan 2010 17:58:30 -0500
Message-ID: <6041d2001001051458j46cdf7abqc4a0a249445ec348@mail.gmail.com>
Subject: Re: BUG during shutdown - bisected to commit e2912009
From: Marc Dionne <marc.c.dionne@gmail.com>
To: Xiaotian Feng <dfeng@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>
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On Tue, Jan 5, 2010 at 5:18 AM, Xiaotian Feng <dfeng@redhat.com> wrote:
> This is outputed by sound module, but it will not affect clockevents, could
> you please try following patch and let me know the output before BUG_ON
> happens? We can gather more information on the BUG_ON. Thank you.
>
> diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
> index 6f740d9..7c945e8 100644
> --- a/kernel/time/clockevents.c
> +++ b/kernel/time/clockevents.c
> @@ -260,6 +260,9 @@ void clockevents_notify(unsigned long reason, void *arg)
> ? ? ? ? ? ? ? ?list_for_each_entry_safe(dev, tmp, &clockevent_devices, list)
> {
> ? ? ? ? ? ? ? ? ? ? ? ?if (cpumask_test_cpu(cpu, dev->cpumask) &&
> ? ? ? ? ? ? ? ? ? ? ? ? ? ?cpumask_weight(dev->cpumask) == 1) {
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? if (dev->mode != CLOCK_EVT_MODE_UNUSED)
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? printk("invalid dev %s mode %d on
> cpu %d\n", dev->name,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? dev->mode, cpu);
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?list_del(&dev->list);

I don't get anything on screen from the printk - is there a trick
needed to getting printk output at that stage of shutting down?  I
tried inserting an mdelay() before the BUG, which delayed the bug
output but still didn't print the invalid dev message.

Thanks,
Marc
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