linux-kernel - Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched

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Date:	Thu, 21 Oct 2010 16:43:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	masami.hiramatsu.pt@...achi.com
Subject: Re: [PATCH][GIT PULL] tracing: Fix compile issue for
 trace_sched_wakeup.c


* Jason Baron <jbaron@...hat.com> wrote:

> > > Looks like this code had jump labels enabled. Do you have a dump where they 
> > > are not enabled?
> > 
> > No. Good find - and the timeline agrees too, these crashes started triggering 
> > when i pulled jump labels from you.
> > 
> > Thanks,
> > 
> > 	Ingo
> 
> indeed. I can re-produce reliably as well on x86...hmmm, I have done stress 
> testing where I basically just enable/disable all the tracepoints in a tight loop 
> and never saw this...but I mostly have been testing on x86_64.

Dont worry about that too much - there will always be bugs that can only be found in 
some special way. Good thing we had the self-tests. (and even those didnt reliably 
trigger it for me)

Thanks,

	Ingo
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