linux-kernel - Re: 2.6.20-git15 BUG: soft lockup detected on CPU#0!

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Message-Id: <1172088044.25076.125.camel@localhost.localdomain>
Date:	Wed, 21 Feb 2007 21:00:44 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.20-git15 BUG: soft lockup detected on CPU#0! - timers?

Michal,

On Wed, 2007-02-21 at 16:38 +0100, Michal Piotrowski wrote:
> > But you still have those softirq pending messages, right ?
> 
> Yes
> 
> (+ new NOHZ: local_softirq_pending 02)

Yike, that's the timer softirq.

Can you add the patch below, maybe it gives us some useful info. Please
enable lockdep (your last config had it already)

Thanks,

	tglx

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 512a4a9..cc705c7 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -165,9 +165,11 @@ void tick_nohz_stop_sched_tick(void)
 		goto end;

 	cpu = smp_processor_id();
-	if (unlikely(local_softirq_pending()))
-		printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
-		       local_softirq_pending());
+	if (unlikely(local_softirq_pending())) {
+		print_irqtrace_events(current);
+		printk(KERN_ERR "NOHZ: local_softirq_pending %02x, %08x\n",
+		       local_softirq_pending(), preempt_count());
+	}

 	now = ktime_get();
 	/*

-
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