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

[Justin P. Mattock]

On 12/02/09 15:16, Luis R. Rodriguez wrote:
> On Wed, Dec 2, 2009 at 2:27 PM, Justin Mattock<justinmattock@xxxxxxxxx>  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 Â.ÃÃ....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

as anticipated I had a feeling reproducing
this would be a bit of a challeng.

so far I was taking into account the actions that
I did yesterday to trigger this, but nothing i.e.

reboot 30 times(until fsck engages), and shutdown/start 30 times
with nothing of the sort.

If you have any ideas on how to reproduce this it would
be greatly appreciated(don't want to throw in the patches, until
I have something to go by).

on the other hand I could throw in the patches, and wait and see,
but would rather have more hard evidence that the patches do fix something.

Justin P. Mattock
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