linux-kernel - Re: main thread pthread_exit/sys

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Date:	Thu, 5 Feb 2009 17:15:44 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Kaz Kylheku <kkylheku@...il.com>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>
Subject: Re: main thread pthread_exit/sys_exit bug!

On 02/04, Kaz Kylheku wrote:
>
> On Wed, Feb 4, 2009 at 7:05 PM, Roland McGrath <roland@...hat.com> wrote:
> > I haven't seen the clear explanation of what specific actual problems there
> > are here.  But I'm quite sure this is not the right approach to address them.
> >
> > Kaz has said things that seemed to imply that the behavior is erratic or
> > the semantics are somehow ill-defined when the group leader has died with
> > other threads living on.  In fact, this case is perfectly well-specified
> > and there is no mystery about it.
>
> I haven't observed anything that could be called erratic. The behavior that
> occurs, occurs reliably.

Yes we have the bug, and wait_task_stopped() should be fixed. But it is
buggy anyway, even if we delay the death of the main thread. But I also
think we shouldn't.

(and I am sorry, I still can't find the time to redo my old patch, will
 try to do this asap).

Oleg.

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