linux-kernel - Re: Long timeout when booting >= 2.6.38

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Date:	Mon, 9 May 2011 10:22:38 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Christian Hoffmann <email@...istianhoffmann.info>
cc:	john stultz <johnstul@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Long timeout when booting >= 2.6.38

On Thu, 5 May 2011, Christian Hoffmann wrote:

> > 
> > So we are back to:
> > 
> > [    0.644189] Calling fixup hook: quirk_usb_early_handoff+0x0/0x4a6
> > [  145.936254] Calling fixup hook: pci_fixup_video+0x0/0xac
> > 
> > So we really need to know what's happening there.
> > 
> > Can you please apply the following patch and enable
> > CONFIG_FUNCTION_TRACER and add "ftrace=function" on the command line?
> > 
> > When the box is up, mount debugfs (mount -t debugfs debugfs
> > /sys/kernel/debug) and read out /sys/kernel/debug/tracing/trace, bzip2
> > it and provide it somewhere for download. If you have no way to do
> > that, mail it to me offlist.
> 
> Hi,
> 
> trace can be found here:
> 
> http://dl.dropbox.com/u/21820416/hanging_2.6.39-rc6.trace.bz2

Thanks, can you please add the following patch and generate another
trace ?

Thanks,

	Thomas

--- linux-2.6.orig/kernel/timer.c
+++ linux-2.6/kernel/timer.c
@@ -1268,11 +1268,14 @@ unsigned long get_next_timer_interrupt(u
 	if (cpu_is_offline(smp_processor_id()))
 		return now + NEXT_TIMER_MAX_DELTA;
 	spin_lock(&base->lock);
+	trace_printk("nx: %lx tj: %lx\n", base->next_timer, base->timer_jiffies);
 	if (time_before_eq(base->next_timer, base->timer_jiffies))
 		base->next_timer = __next_timer_interrupt(base);
 	expires = base->next_timer;
 	spin_unlock(&base->lock);
 
+	trace_printk("ex: %lx nw: %lx\n", expires, now);
+
 	if (time_before_eq(expires, now))
 		return now;
 
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