linux-kernel - Re: Crashes with 874bbfe600a6 in 3.18.25

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Message-ID: <20160205205456.GG4401@htj.duckdns.org>
Date:	Fri, 5 Feb 2016 15:54:56 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Michal Hocko <mhocko@...nel.org>, Jiri Slaby <jslaby@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Petr Mladek <pmladek@...e.com>, Jan Kara <jack@...e.cz>,
	Ben Hutchings <ben@...adent.org.uk>,
	Sasha Levin <sasha.levin@...cle.com>, Shaohua Li <shli@...com>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
	Daniel Bilik <daniel.bilik@...system.cz>
Subject: Re: Crashes with 874bbfe600a6 in 3.18.25

Hello, Mike.

On Fri, Feb 05, 2016 at 09:47:11PM +0100, Mike Galbraith wrote:
> That very point is what makes it wrong for the workqueue code to ever
> target a work item.  The instant it does target selection, correctness
> may be at stake, it doesn't know, thus it must assume the full onus,
> which it has neither the knowledge not the time to do.  That's how we
> exploded on node = -1, trying to help out the user by doing his job,

I have a hard time seeing the NUMA_NO_NODE bug as something that
indicative of anything.  It is a dumb bug from mm side which puts
everyone using cpu_to_node() at risk.

> but then not doing the whole job.  IMHO, a better plan is to let the
> user screw it up all by himself.

What are you suggesting?

Thanks.

-- 
tejun