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Date: Tue, 17 Jan 2012 19:14:36 +0100 From: Oleg Nesterov <oleg@...hat.com> To: Cyrill Gorcunov <gorcunov@...il.com> Cc: LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Pavel Emelyanov <xemul@...allels.com>, Serge Hallyn <serge.hallyn@...onical.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>, Vasiliy Kulikov <segoon@...nwall.com> Subject: Re: [RFC] fs, proc: Introduce /proc/<pid>/task/<tid>/children entry v6 On 01/17, Cyrill Gorcunov wrote: > > On Tue, Jan 17, 2012 at 06:40:49PM +0100, Oleg Nesterov wrote: > ... > > > > > > > > But this is not enough. exit_ptrace() can do list_move() without > > > > changing ->real_parent. > > > > > > > > I'll try to think. At first glance we can rely on EXIT_DEAD, but > > > > I'd like to avoid this, I think EXIT_DEAD should die. > > > > > > Ouch! Thanks for catching this Oleg. I'll try to come with something > > > to show as well. > > > > Do you see another approach? I don't, so I'd suggest to check > > "task->exit_state != EXIT_DEAD" instead of !list_empty(). > > > > Well, I thought what if I can find another way without EXIT_DEAD > but seems there is no luck. Oooooh. Cyrill, it seems I managed to confuse you. And myself. exit_ptrace() doesn't use ->sibling, it uses ->ptrace_entry!. Sorry! Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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