linux-kernel - Re: [BUG RT] - rcupreempt.c:133 on 2.6.23-rc1-rt7

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Date:	Sun, 5 Aug 2007 10:24:15 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	"Paul E. McKenney" <paulmck@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	RT <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG  RT] - rcupreempt.c:133 on 2.6.23-rc1-rt7


--

On Sun, 5 Aug 2007, Ingo Molnar wrote:

>
> * Steven Rostedt <rostedt@...dmis.org> wrote:
>
> > > I don't have time to look further now, and it's something that isn't
> > > easily reproducible (Well, it happened once out of two boots). If
> > > you need me to look further, or need a config or dmesg (I have
> > > both), then just give me a holler.
> >
> > Silly me. FYI, I was running with !PREEMPT_RT, but with Hard and
> > Softirqs as threads.  Must have copied the wrong config over :-/
>
> it's still not supposed to happen ... rcu read lock nesting that deep?
>

The code on line 133 is:

	WARN_ON_ONCE(current->rcu_read_lock_nesting > NR_CPUS);

I have NR_CPUS set to 2 since the box I'm running this on only has
2 cpus and I see no reason to waste more data structures.

Is rcu read lock nesting deeper than 2?

-- Steve

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