linux-kernel - Re: [path][rfc] add PR

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Message-ID: <4D979C6E.2090503@aknet.ru>
Date:	Sun, 03 Apr 2011 02:00:14 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [path][rfc] add PR_DETACH prctl command

02.04.2011 17:55, Oleg Nesterov wrote:
>
>>>>   +			if (me->real_parent == init_pid_ns.child_reaper)
>>>   Also, the task can be the child of /sbin/init's sub-thread.
>> Hmm, how to check then? Should I add the "exact_parent" just
>> for that? Or traverse the sibling list? How bad. :(
> You can check same_thread_group(real_parent, ns->child_reaper)
But real_parent==ns->child_reaper in our case, so what does
this check give?

>  acked, I'd try to nack this;)  do_wait() from parent should
>  always work or it should always return ECHLD, but it should
>  not depend on /dev/random. This is really weird, imho.
OK, this can be fixed by delaying the wait() from init till
the old parent wait()s or die. Will fix.

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