linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Message-Id: <1288078144.7478.9.camel@marge.simson.net>
Date:	Tue, 26 Oct 2010 09:29:04 +0200
From:	Mike Galbraith <mgalbraith@...e.de>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Tue, 2010-10-26 at 09:07 +0200, Mike Galbraith wrote:
> On Thu, 2010-10-21 at 18:29 +0200, Oleg Nesterov wrote:
> 
> > It is not clear to me why do we need rcu_read_lock() and how it can help.
> > The tty can go away right after dereferencing signal->tty.
> 
> Which was Marcus' crash.  Didn't happen here only because I didn't have
> CONFIG_PREEMPT set.
> 
> Changes since v2:
>   - drop  

Bumped mouse, message escaped.

Doesn't matter though, damn thing just blew up during enable/disable
plus hackbench stress test, despite holding a reference to the tty at
every place tty changes (under sighand lock), and moving the task with
that reference held.

CONFIG_PREEMPT is being a little S.O.B.

	-Mike

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