linux-kernel - Re: [PATCH] ptrace: add ability to get clear_tid

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Message-ID: <20120208173103.GA20853@redhat.com>
Date:	Wed, 8 Feb 2012 18:31:03 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Pedro Alves <palves@...hat.com>
Cc:	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ptrace: add ability to get clear_tid_address

On 02/08, Pedro Alves wrote:
>
> I just tried it.  This is &pthread->tid in glibc/libpthread, so with debug
> info it's easy to figure out where to set the watchpoint manually with gdb
> without asking the kernel.  Doesn't work.  ptrace doesn't show any trap
> for the kernel writes.

The tracee simply can't report this trap. it is already dead ;) and
hw breakpoint (used by ptrace) is "pinned" to the thread.

Oleg.

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