linux-kernel - Re: [RFC][PATCH] muptiple bugs in PI futexes

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Message-Id: <1181077986.4404.165.camel@chaos>
Date:	Tue, 05 Jun 2007 23:13:06 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: [RFC][PATCH] muptiple bugs in PI futexes

On Wed, 2007-06-06 at 01:00 +0400, Alexey Kuznetsov wrote:
> Hello!
> 
> > We actually need to do something about this, as we might loop for ever
> > there. The robust cleanup code can fail (e.g. due to list corruption)
> > and we would see exit_state != 0 and the OWNER_DIED bit would never be
> > set, so we are stuck in a busy loop.
> 
> Yes...
> 
> It is possible to take read_lock(&tasklist_lock) before:

We really want to avoid the tasklist_lock at all. It's not trivial, but
I think it's doable. I send you a patch to test tomorrow morning when my
brain recovered from looking at that code :)

	tglx



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