linux-kernel - Re: WARNING: __GFP_FS allocations with IRQs disabled (kmemcheck_alloc

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Message-ID: <alpine.DEB.2.00.1207090851530.27519@router.home>
Date:	Mon, 9 Jul 2012 08:52:13 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Pekka Enberg <penberg@...nel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: __GFP_FS allocations with IRQs disabled
 (kmemcheck_alloc_shadow)

On Sun, 8 Jul 2012, Fengguang Wu wrote:

> Hi Vegard,
>
> This warning code is triggered for the attached config:
>
> __lockdep_trace_alloc():
>         /*
>          * Oi! Can't be having __GFP_FS allocations with IRQs disabled.
>          */
>         if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags)))
>                 return;
>
> Where the irq is possibly disabled at the beginning of __slab_alloc():

Rights its possible. Depends on the callers specification of gfp flags.

View attachment "dmesg-kvm-waimea-2166-2012-07-08-11-02-20" of type "TEXT/PLAIN" (54320 bytes)

View attachment "config-3.5.0-rc5+" of type "TEXT/PLAIN" (56159 bytes)