linux-kernel - Re: vmstat: On demand vmstat workers V8

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Message-ID: <alpine.DEB.2.11.1407281353450.15405@gentwo.org>
Date:	Mon, 28 Jul 2014 13:55:17 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	akpm@...ux-foundation.org, Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, John Stultz <johnstul@...ibm.com>,
	Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
	viresh.kumar@...aro.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org
Subject: Re: vmstat: On demand vmstat workers V8

On Fri, 25 Jul 2014, Sasha Levin wrote:

> This patch doesn't interact well with my fuzzing setup. I'm seeing
> the following:
>
> [  490.446927] BUG: using __this_cpu_read() in preemptible [00000000] code: kworker/16:1/7368
> [  490.447909] caller is __this_cpu_preempt_check+0x13/0x20

__this_cpu_read() from vmstat_update is only called from a kworker that
is bound to a single cpu. A false positive?
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