linux-kernel - Re: [patch v2 for-3.2] block: initialize request

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Date:	Wed, 23 Nov 2011 10:59:35 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	David Rientjes <rientjes@...gle.com>
CC:	Mike Snitzer <snitzer@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Dave Young <dyoung@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kexec@...ts.infradead.org,
	stable@...r.kernel.org
Subject: Re: [patch v2 for-3.2] block: initialize request_queue's numa node
 during allocation

On 2011-11-23 02:14, David Rientjes wrote:
> From: Mike Snitzer <snitzer@...hat.com>
> 
> struct request_queue is allocated with __GFP_ZERO so its "node" field is 
> zero before initialization.  This causes an oops if node 0 is offline in 
> the page allocator because its zonelists are not initialized.  From Dave 
> Young's dmesg:
> 
> 	SRAT: Node 1 PXM 2 0-d0000000
> 	SRAT: Node 1 PXM 2 100000000-330000000
> 	SRAT: Node 0 PXM 1 330000000-630000000
> 	Initmem setup node 1 0000000000000000-000000000affb000
> 	...
> 	Built 1 zonelists in Node order, mobility grouping on.
> 	...
> 	BUG: unable to handle kernel paging request at 0000000000001c08
> 	IP: [<ffffffff8111c355>] __alloc_pages_nodemask+0xb5/0x870
> 
> and __alloc_pages_nodemask+0xb5 translates to a NULL pointer on 
> zonelist->_zonerefs.
> 
> The fix is to initialize q->node at the time of allocation so the correct 
> node is passed to the slab allocator later.
> 
> Since blk_init_allocated_queue_node() is no longer needed, merge it with 
> blk_init_allocated_queue().

Thanks, queued for current release.

-- 
Jens Axboe

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