linux-kernel - Re: [RFC PATCH V2] tracing: Check f_dentry before accessing event_file/call in inode->i

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Message-ID: <51E5FD33.4040604@hitachi.com>
Date:	Wed, 17 Jul 2013 11:10:59 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	jovi.zhangwei@...wei.com, Jiri Olsa <jolsa@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH V2] tracing: Check f_dentry before accessing event_file/call
 in inode->i_private

(2013/07/16 3:16), Oleg Nesterov wrote:
> On 07/09, Masami Hiramatsu wrote:
>>
>> To avoid this, when opening events/*/*/enable, we have to ensure
>> the dentry of the file is not unlinked yet, under event_mutex
>> is locked.
> 
> Probably this can work, but I am starting to think that this ref
> count becomes toooooo complex....

Oleg, I agree that is a bit complex way to fix but it can fix.

However, I think we should fix bugs first, because there are bugs.
I don't like to leave a bug in the kernel as it is, while we re-
start discussing new approach...

> Could you please look at the draft patch I sent in another email?

I'm happy to see the series, and I guess it will take a long
discussion and review time again.

So, I'd like to suggest you getting these fixes into ftrace as
first-aid treatment, and discuss your new series.

Thank you,

-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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