linux-kernel - Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]

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Message-ID: <20071208154755.GA5255@elte.hu>
Date:	Sat, 8 Dec 2007 16:47:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Parag Warudkar <parag.warudkar@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]


* Parag Warudkar <parag.warudkar@...il.com> wrote:

>  [<c0438293>] tick_broadcast_oneshot_control+0x10/0xda
>  [<c0437ce2>] tick_notify+0x1d4/0x2eb
>  [<c04281bc>] get_next_timer_interrupt+0x143/0x1b4
>  [<c06058a1>] notifier_call_chain+0x2a/0x47
>  [<c04345c0>] raw_notifier_call_chain+0x17/0x1a
>  [<c043781e>] clockevents_notify+0x19/0x4f
>  [<c0533d23>] acpi_idle_enter_simple+0x183/0x1d0
>  [<c058cf03>] cpuidle_idle_call+0x53/0x78
>  [<c058ceb0>] cpuidle_idle_call+0x0/0x78
>  [<c0402575>] cpu_idle+0x97/0xb8
>  =======================
> BUG: soft lockup - CPU#1 stuck for 11s! [vim:3736]

does the patch below help? But the root cause is likely some timer 
problems - do you get consistent results from:

   while :; do time usleep 1111111; done

or do these sleeps fluctuate?

	Ingo

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -774,6 +774,7 @@ void sched_clock_idle_wakeup_event(u64 d
 	struct rq *rq = cpu_rq(smp_processor_id());
 	u64 now = sched_clock();
 
+	touch_softlockup_watchdog();
 	rq->idle_clock += delta_ns;
 	/*
 	 * Override the previous timestamp and ignore all
--
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