Re: [PATCH 0/5] mm: poison critical mm/ structs

From: Sasha Levin
Date: Thu Oct 09 2014 - 15:12:02 EST

On 10/02/2014 05:23 AM, Hugh Dickins wrote:
> I'm glad to hear they've confirmed some vm_area_struct corruption:
> any ideas on where that's coming from?


I think that what we're seeing isn't a corruption of vm_area_struct
per-se, but something weirder.

I've poisoned every spot where vm_area_struct is allocated, and yet
there seems to be nothing that's hitting that field before we end
up using a "zeroed out" vm_area_struct.

The results are the same both with and without kasan, there seems
to be no corruption happening anywhere, but we somehow end up with
an empty vm_area_struct.

It also somewhat makes sense considering that we're seeing no slub
corruption either. Either something is zeroing out *exactly*
vm_area_struct, or it's not really corruption...

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