Re: Slab coruption and oops with 2.6.1-mm4

[Manfred Spraul]

Calin wrote:

> Then usual oops but *before that* something which hasn't happened before.
> Slab corruption: start=c57c2000, len=4096
> 000: 6e 72 6d 71 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
>  
Is that reproducable? The selftest code in slab noticed a change in a 
buffer that is not in use: All values should be 0x6b, but the first 4 
bytes are different.
Could you try to boot with CONFIG_DEBUG_PAGEALLOC enabled? Perhaps that 
identifies who corrupts the page. Unfortunately it can't detect DMA writes.

> ------------ kernel BUG at include/linux/mm.h:275!
put_page_testzero noticed that the page count was already 0. It seems 
that someone uses memory that was already freed.

--
   Manfred



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