linux-kernel - Re: PATCH? trace_remove_event_call() should fail if call is active

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Message-ID: <20130703175420.GA25668@redhat.com>
Date:	Wed, 3 Jul 2013 19:54:20 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: PATCH? trace_remove_event_call() should fail if call is active

On 07/03, Oleg Nesterov wrote:
>
> IOW. So far _I think_ we just need the additional changes in
> trace_remove_event_call() if it succeeds (with the patch I sent)
> to prevent the races like above, but I didn't even try to think
> about this problem.

And I guess greatly underestimated the problem(s). When I look at
this code now, it seems that, say, event_enable_write() will use
the already freed ftrace_event_file in this case.

Still I think this is another (although closely related) problem.

> Or I missed your point completely?

Yes?

Oleg.

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