linux-kernel - Re: <IRQ> [<ffffffff810c9204>] ? __alloc_pages

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Message-ID: <alpine.DEB.2.00.1103051847100.8779@chino.kir.corp.google.com>
Date:	Sat, 5 Mar 2011 18:50:11 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Justin Mattock <justinmattock@...il.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: <IRQ> [<ffffffff810c9204>] ?
 __alloc_pages_nodemask+0x622/0x696

On Sat, 5 Mar 2011, Justin Mattock wrote:

> [  339.787008] SLUB: Unable to allocate memory on node -1 (gfp=0x20)
> [  339.787008]   cache: kmalloc-8192, object size: 8192, buffer size:
> 8264, default order: 3, min order: 2
> [  339.787008]   kmalloc-8192 debugging increased min order, use
> slub_debug=O to disable.
> [  339.787008]   node 0: slabs: 181, objs: 543, free: 0
> [  339.790575] skbuff alloc of size 3904 failed
> [  339.823775] swapper: page allocation failure. order:2, mode:0x4020
> [  339.823781] Pid: 0, comm: swapper Not tainted 2.6.38-rc7-00143-gd1b152c #7
> [  339.823783] Call Trace:
> [  339.823786]  <IRQ>  [<ffffffff810c9204>] ? __alloc_pages_nodemask+0x622/0x696
> [  339.823811]  [<ffffffffa015a077>] ? ath_rxbuf_alloc+0x29/0x9a [ath]
> [  339.823815]  [<ffffffff810f67cf>] ? new_slab+0x7b/0x1c6
> [  339.823819]  [<ffffffffa015a077>] ? ath_rxbuf_alloc+0x29/0x9a [ath]
> [  339.823823]  [<ffffffff810f6dd6>] ? T.925+0x163/0x29c
> [  339.823827]  [<ffffffff810c4ecc>] ? mempool_destroy+0xf/0x17
> [  339.823832]  [<ffffffffa015a077>] ? ath_rxbuf_alloc+0x29/0x9a [ath]
> [  339.823836]  [<ffffffff810f895a>] ? __kmalloc_track_caller+0xfe/0x190
> 

Order-2 atomic allocations are always going to be difficult since we can't 
do synchronous compaction or reclaim, but I'd try the suggestion shown 
above: boot with slub_debug=O or disable slub debugging so that 
kmalloc-8192 is actually order-1 like it should be.
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