linux-kernel - Re: FTRACE_WARN_ON((rec->flags & ~FTRACE_FL

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Message-ID: <20130828182710.GA14103@redhat.com>
Date:	Wed, 28 Aug 2013 14:27:10 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == 0))

On Wed, Aug 28, 2013 at 11:17:46AM -0400, Steven Rostedt wrote:
 
 > Dave, can you add this patch to your kernels you test, and that way,
 > the next time you hit this error, I want to see if this warning was
 > triggered too.
 > 
 > If we did not unregister the ftrace ops but free the filters, it will
 > cause the accounting to get out of whack.
 > 
 > Thanks!
 > 
 > -- Steve
 > 
 > diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
 > index 80c36bc..05167bb 100644
 > --- a/kernel/trace/trace_event_perf.c
 > +++ b/kernel/trace/trace_event_perf.c
 > @@ -306,6 +306,7 @@ static int perf_ftrace_function_unregister(struct perf_event *event)
 >  {
 >  	struct ftrace_ops *ops = &event->ftrace_ops;
 >  	int ret = unregister_ftrace_function(ops);
 > +	WARN_ON(ret);
 >  	ftrace_free_filter(ops);
 >  	return ret;
 >  }

I hit the WARN in the subject, and then this new one immediately afterwards.

	Dave.

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