linux-kernel - Re: [PATCH 1/4] tools lib traceevent: Add state member to struct trace

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Message-ID: <20140106094521.2deb8232@gandalf.local.home>
Date:	Mon, 6 Jan 2014 09:45:21 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] tools lib traceevent: Add state member to struct
 trace_seq

On Mon, 6 Jan 2014 15:38:28 +0100
Jiri Olsa <jolsa@...hat.com> wrote:


> > I just thought that it's not so important to print message so keeps the
> > error internally until it gets printed.  But I can be wrong as usual...
> 
> I think that if she manages to get one of those errors
> the perf would fail soon anyway.. so it feels better
> to print it out immediately.

Yeah, using a trace_seq after it has been destroyed is a critical
failure, and a major bug. A print to the user console should not be a
problem here. And actually, crashing is not that bad either, as glibc
does the same with using free() of a freed pointer.

But as this error is major, an unwanted print is minor.

-- Steve
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