linux-kernel - Re: [ath9k-devel] BUG kmalloc-8192: Poison overwritten

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Message-ID: <43e72e890912021516k736db118j217dc92496db8f19@mail.gmail.com>
Date:	Wed, 2 Dec 2009 15:16:54 -0800
From:	"Luis R. Rodriguez" <mcgrof@...il.com>
To:	Justin Mattock <justinmattock@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ath9k-devel@...ts.ath9k.org
Subject: Re: [ath9k-devel] BUG kmalloc-8192: Poison overwritten

On Wed, Dec 2, 2009 at 2:27 PM, Justin Mattock <justinmattock@...il.com> wrote:
> I have no idea what this is:
> (first time I've seen this);
>
>
> [   13.055592] =============================================================================
> [   13.055865] BUG kmalloc-8192: Poison overwritten
> [   13.056046] -----------------------------------------------------------------------------

I believe this means we write to an area in memory after we freed an skb.

> [   13.056366] INFO: 0xffff88003290a100-0xffff88003290a143. First byte
> 0x50 instead of 0x6b
> [   13.056366] INFO: Allocated in ath_rxbuf_alloc+0x25/0x94 [ath]
> age=8898 cpu=0 pid=892
> [   13.056366] INFO: Freed in skb_release_data+0xc1/0xc6 age=99 cpu=0 pid=0
> [   13.056366] INFO: Slab 0xffffea0000b0f9c0 objects=3 used=0
> fp=0xffff88003290c090 flags=0x4000000000004082
> [   13.056366] INFO: Object 0xffff88003290a048 @offset=8264
> fp=0xffff880032908000
> [   13.056366]
> [   13.056366] Bytes b4 0xffff88003290a038:  b9 9e fb ff 00 00 00 00
> 5a 5a 5a 5a 5a 5a 5a 5a ¹.ûÿ....ZZZZZZZZ

Can you reproduce this? We had a similar report from Miles Lanes I
have been trying to followup on for a while now. The suggested patches
to try are:

http://bombadil.infradead.org/~mcgrof/patches/ath9k/2009/11-19/70-mac80211-total-ampdu-tx-info.patch
http://bombadil.infradead.org/~mcgrof/patches/ath9k/2009/11-19/71-ath9k-remove-tx_info_priv.patch

  Luis
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