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

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Message-ID: <20140626134934.20d1d28f@gandalf.local.home>
Date:	Thu, 26 Jun 2014 13:49:34 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.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

On Tue, 24 Jun 2014 15:55:41 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> 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..

Yeah, but it's just a change log, and I think people can figure it out
(I hope).

-- Steve
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