linux-kernel - Re: Bug: fio traps into kernel without exiting because futex has a deadloop

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Date:	Fri, 12 Jun 2009 10:12:04 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Darren Hart <dvhltc@...ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Bug: fio traps into kernel without exiting because futex has a
 deadloop

On Fri, 12 Jun 2009, Zhang, Yanmin wrote:
> On Thu, 2009-06-11 at 13:36 +0200, Peter Zijlstra wrote:
> > FWIW, using a private futex on a shm section is wrong in and of itself.
>
> What I mean is it could be used as a DOS attack.

Right. Fix is on the way.
 
> Did you try my test case? Could you kill it when it runs?

No, you can not kill it. That's why it needs a proper fix. Will send
out today.
 
Thanks,

	tglx
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