linux-kernel - Re: init's children list is long and slows reaping children.

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Message-ID: <46169A34.3030808@zytor.com>
Date:	Fri, 06 Apr 2007 12:06:28 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>, Robin Holt <holt@....com>,
	Chris Snook <csnook@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: init's children list is long and slows reaping children.

Eric W. Biederman wrote:
> 
> Oleg is coming from a different case where it was found that exiting kernel
> threads were causing problems for nash when nash was run as init in an
> initramfs.  While I think that case is likely a user space bug because
> nash should check the pid from waidpid before assuming the process it
> was waiting for returned.
> 

Are you saying waitpid() (wait4) *with a pid specified* can return 
another pid?  That definitely sounds like a bug.

	-hpa
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