linux-kernel - Re: ftrace/kprobes: Warning when insmod two modules

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Message-ID: <20140324102735.122e1cf2@gandalf.local.home>
Date:	Mon, 24 Mar 2014 10:27:35 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Takao Indoh <indou.takao@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: ftrace/kprobes: Warning when insmod two modules

On Mon, 24 Mar 2014 20:26:05 +0900
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

 
> Thank you for reporting with this pretty backtrace :)
> Steven, I think this is not the kprobe bug but ftrace (and perhaps, module).
> 
> If the ftrace can set loading module text read only before the module subsystem
> expected, I think it should be protected by the module subsystem itself
> (e.g. set_all_modules_text_ro(rw) skips the modules which is MODULE_STATE_COMING)
> 

I have to admit. I never thought about having the module init code
enabling ftrace :-)

Yeah, it looks like we need to handle this case. I'll take a look into
it.

Thanks for the report,

-- Steve
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