linux-kernel - Re: NOHZ: local_softirq

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Date:	Fri, 23 Nov 2007 13:30:15 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: NOHZ: local_softirq_pending 20

On Fri, 23 Nov 2007, Uwe Kleine-König wrote:
> my kernel reported:
> 
> 	NOHZ: local_softirq_pending 20

Thats TASKLET_SOFTIRQ

> I cannot interpret it, but probably this is bad, because before
> bc5393a6c9c0e70b4b43fb2fb63e3315e9a15c8f this used to BUG().

We removed the BUG, because it's a situation where the kernel can
easily recover. It should never happen that the kernel goes to sleep
with a pending softirq, but it's not a fatal error.

> This happend while having a high load.  Up to now it only happend once
> and I cannot reproduce it.

That's hard to tell then. Without a reproducible test case I can not
do much to help debugging this.

   tglx