linux-kernel - Re: LTP 20080131 causes defunct processes w/2.6.30-rc1 (possible ptrace issue?)

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Message-ID: <20090410121525.GA4760@redhat.com>
Date:	Fri, 10 Apr 2009 14:15:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: LTP 20080131 causes defunct processes w/2.6.30-rc1 (possible
	ptrace issue?)

On 04/10, Kumar Gala wrote:
>
> That seems to clear it up.. But why has the behavior changed?  I didn't
> have to do the "kill -CONT 1" on 2.6.29.

I didn't look at the test-case yet, so I don't know what happens.

But, before this comment, /sbin/init always ignored SIGSTOP.
Now it is possible to stop init. Of course, user-space can't
send SIGSTOP to init directly. But if you are ptracer, or send
SIGSTOP to the sub-namespace, it should work.

Oleg.

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