Re: PPC: slab error in cache_free_debugcheck() from sd_revalidate_disk

[Manfred Spraul]

John wrote:

> Hardware: PowerMac 8500 (see attached 'lspci' and 'dmesg' for details), 
> 	  ADB keyboard/mouse, USB mouse, Sony 100ES monitor
> Software: Debian 'Testing' branch
>
> Sorry, this may not be a very helpful bug report.  Let me know what additional
> information might be helpful and perhaps i can rig up a serial console for
> this beast.
>  
[snip]

> Oct 14 15:47:34 penngrove kernel: cddeec88: redzone 1: 0x0, redzone 2: 0x170fc2a5.
> O
That looks like a bug Ben reported some time ago: The dma controller 
trashes the whole cacheline when it transfers data from disk to memory.
I think the only solution is to disable redzoning for the kmalloc 
caches, or to use get_free_pages instead of kmalloc for the disk buffers,.

--
   Manfred

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