linux-kernel - Re: [PATCH 6/6] clone4: Introduce new CLONE_FD flag to get task exit notification via fd

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Date:	Sat, 14 Mar 2015 12:01:32 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Thiago Macieira <thiago.macieira@...el.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>, Rik van Riel <riel@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 6/6] clone4: Introduce new CLONE_FD flag to get task exit
 notification via fd

On Sat, Mar 14, 2015 at 11:38:29AM -0700, Thiago Macieira wrote:
> On Saturday 14 March 2015 15:32:35 Oleg Nesterov wrote:
> > It is not clear to me what do_wait() should do with ->autoreap child, even
> > ignoring ptrace.
> > 
> > Just suppose that real_parent has a single "autoreap" child. Should
> > wait(NULL) hanf then?
> 
> It should ignore the child that is set to autoreap. wait(NULL) should return -
> ECHILD, indicating there are no children waiting to be reaped.

Right.  And I don't think the current code does this.  I think we need
to change wait_consider_task to early-return for ->autoreap just as it
does for task_state == EXIT_DEAD.  I'll do that in v2.

- Josh Triplett
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