linux-kernel - Re: [RFC PATCH] set TASK_TRACED before arch

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Message-ID: <3877989d0805262334j1ce4d0efhe05e0aa8c3975a28@mail.gmail.com>
Date:	Tue, 27 May 2008 14:34:26 +0800
From:	"Luming Yu" <luming.yu@...il.com>
To:	"Roland McGrath" <roland@...hat.com>
Cc:	"Petr Tesarik" <ptesarik@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>, linux-ia64@...r.kernel.org
Subject: Re: [RFC PATCH] set TASK_TRACED before arch_ptrace code to fix a race

On Tue, May 27, 2008 at 2:12 PM, Roland McGrath <roland@...hat.com> wrote:
>>  [<a00000010000a9f0>] skip_rbs_switch+0xe0/0x110
>>                                 sp=e000000141c9fe30 bsp=e000000141c90cf8
>>  [<a000000000010740>] __kernel_syscall_via_break+0x0/0x20
>>                                 sp=e000000141ca0000 bsp=e000000141c90cf8
>>  [<a0000001000971c0>] ptrace_stop+0xa0/0x3e0
>>                                 sp=e00000014716fdb0 bsp=e000000147160ca8
>>  [<a000000100097650>] ptrace_notify+0x150/0x1c0
>>                                 sp=e00000014716fdb0 bsp=e000000147160c88
>
> If this is a backtrace of a single thread on the same kernel stack, it has
> a stack depth of over 84MB.  You still need to follow the path inside

you are right, I just find outputs of two different thread are mixed!
Please just ignore the call trace above..
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