linux-kernel - Re: [PATCH 3/8] job control: Fix ptracer wait(2) hang and explain notask

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Message-ID: <20110321160903.GA26520@redhat.com>
Date:	Mon, 21 Mar 2011 17:09:03 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	roland@...hat.com, jan.kratochvil@...hat.com,
	vda.linux@...glemail.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	indan@....nu
Subject: Re: [PATCH 3/8] job control: Fix ptracer wait(2) hang and explain
	notask_error clearing

On 03/21, Oleg Nesterov wrote:
>
> On 03/08, Tejun Heo wrote:
> >
> > +		if (likely(!ptrace) || (wo->wo_flags & WCONTINUED))
> > +			wo->notask_error = 0;
>
> I don't understand this part. Suppose that this task is not traced and
> its real parent does do_wait(WEXITED). We shouldn't return -ECHLD in
> this case (EXIT_ZOMBIE && delay_group_leader()).

Argh. please ingnore this part. I misread the code above.

> If the task is traced and debugger does do_wait(WEXITED) we should not
> return -ECHLD too.

Still true, or I missed something again...

Oleg.

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