linux-kernel - Re: ptrace(PTRACE_ATTACH) [no intervering wait] ptrace(PTRACE

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Message-ID: <20130723164305.GA28460@redhat.com>
Date:	Tue, 23 Jul 2013 18:43:05 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: ptrace(PTRACE_ATTACH)  [no intervering wait]
	ptrace(PTRACE_DETACH) may leave tracee stuck

Damn. Sorry for noise Mike,

On 07/23, Oleg Nesterov wrote:
>
> OTOH, in this particular case pldd.c doesn't really need PTRACE_DETACH,
> it can simply exit.

No it can't, I forgot that exit_ptrace() doesn't (and can't) clear
->exit_code. And this is another reason why PTRACE_DETACH needs the
stopped tracee.

Oleg.

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