linux-kernel - Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after PTRACE

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Message-ID: <20110228164814.GA8538@redhat.com>
Date:	Mon, 28 Feb 2011 17:48:14 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Denys Vlasenko <vda.linux@...glemail.com>,
	Roland McGrath <roland@...hat.com>, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 1/1] ptrace: make sure do_wait() won't hang after
	PTRACE_ATTACH

On 02/28, Tejun Heo wrote:
>
> I believe this is already solved by making the tracee always enter
> TASK_TRACED via ptrace_stop() on attach, which always reports the
> group stop signal to the ptracer whether the real parent has consumed
> it or not.  The patch is at the top of this gigantic thread.  Oleg,
> this is solved one, right?

Yes, sure. gdb will never see the stopped (I mean task->state) tracee
after attach, so it does not need to do something special. This problem
with exit_code == 0 is fixed too.

Oleg.

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