linux-kernel - Re: Lockup in tracepoint unregister in sched switch ftrace plugin

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Date:	Tue, 21 Oct 2008 09:03:35 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Lockup in tracepoint unregister in sched switch ftrace plugin


On Tue, 21 Oct 2008, Ingo Molnar wrote:
> > 
> > Note, I just booted this kernel with CONFIG_NOHZ=n and it booted fine. 
> > This looks like a bug somewhere in tracepoints/RCU/dynamic-ticks
> 
> does it work with fb02fbc14 reverted? (see the reverter patch below or 
> try tip/master)

Yes! With this revert (I applied your patch) it now boots with 
CONFIG_NO_HZ=y.

(now I go look to see why preemptoff failed its selftest)

-- Steve

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