linux-kernel - Re: [for-next][PATCH v2 1/3] tracing: Fix syscall_*regfunc() vs copy

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Date:	Tue, 24 Jun 2014 15:55:41 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [for-next][PATCH v2 1/3] tracing: Fix syscall_*regfunc() vs copy_process() race

Hi Steve,

On Fri, 20 Jun 2014 06:45:19 -0400, Steven Rostedt wrote:
> From: Oleg Nesterov <oleg@...hat.com>
>
> syscall_regfunc() and syscall_unregfunc() should set/clear
> TIF_SYSCALL_TRACEPOINT system-wide, but do_each_thread() can race
> with copy_process() and miss the new child which was not added to
> the process/thread lists yet.
>
> Change copy_process() to update the child's TIF_SYSCALL_TRACEPOINT
> under tasklist.

s/tasklist/tasklist_lock/ ?

Probably I'm too late..

Thanks,
Namhyung
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