linux-kernel - Re: kthread_stop insanity (Re: [[DEBUG] force] 2642458962: BUG: unable to handle kernel paging request at ffffc90000997f18)

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Message-ID: <CA+55aFx1Df57M+vZL=_RTOtUYB7SK-A7Wt29mj0S=YTK6H+bSQ@mail.gmail.com>
Date:	Tue, 28 Jun 2016 14:35:15 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Oleg Nesterov <oleg@...hat.com>, Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, LKP <lkp@...org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel test robot <xiaolong.ye@...el.com>
Subject: Re: kthread_stop insanity (Re: [[DEBUG] force] 2642458962: BUG:
 unable to handle kernel paging request at ffffc90000997f18)

On Tue, Jun 28, 2016 at 2:21 PM, Andy Lutomirski <luto@...capital.net> wrote:
>
>  Or are you
> suggesting that we actually make a list somewhere of stacks that are
> nominally unused but are still around for RCU's benefit and then
> scavenge from that lest when we need a new stack?

Yes. We'd have to make our own list (rather than just use the RCU list
itself where everything goes), but..

> If so, that seems considerably more complicated than just adding a reference count.

Fair enough.

             Linus