linux-kernel - Re: [RFC NEXT] mm: Fix suspicious RCU usage at kernel/sched/core.c:7318

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Message-ID: <20150616210720.GC3958923@devbig242.prn2.facebook.com>
Date:	Tue, 16 Jun 2015 14:07:21 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Larry Finger <Larry.Finger@...inger.net>
CC:	Tejun Heo <tj@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	Kernel Team <kernel-team@...com>
Subject: Re: [RFC NEXT] mm: Fix suspicious RCU usage at
 kernel/sched/core.c:7318

On Mon, Jun 15, 2015 at 04:25:18PM -0500, Larry Finger wrote:
> Additional backtrace lines are truncated. In addition, the above splat is
> followed by several "BUG: sleeping function called from invalid context
> at mm/slub.c:1268" outputs. As suggested by Martin KaFai Lau, these are the
> clue to the fix. Routine kmemleak_alloc_percpu() always uses GFP_KERNEL
> for its allocations, whereas it should use the value input to pcpu_alloc().
Just a minor nit, 'kmemleak_alloc_percpu() should follow the gfp from
per_alloc()' may be a more accurate title to describe the patch.

Acked-by: Martin KaFai Lau <kafai@...com>
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