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Date:	Thu, 23 Feb 2012 16:17:54 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	tj@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [ptrace] Problem with ptrace cleanup logic.

On 02/23, Tetsuo Handa wrote:
>
> I noticed that ptrace(PTRACE_ATTACH, 1) makes the global init process remain
> killable even after a process that called ptrace(PTRACE_ATTACH, 1) exits.

Yes, known problem. We should cleanup the usage of signal->flags.
This also allows to kill the new bitfields in signal_struct.

But firstly we should cleanup force_sig_info(), I sent the initial
patches.

The problem is: init loses SIGNAL_UNKILLABLE.

Oleg.

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