Re: frequent slab corruption (since a long time)

From: Andi Kleen
Date: Tue Aug 01 2006 - 23:36:02 EST

Dave Jones <davej@xxxxxxxxxx> writes:

> Every so often, I see a slab corruption bug reported against
> the Fedora kernels (going back as far as 2.6.11), and it's
> still plagueing us.
> It seems to have turned up in a number of different scenarios,
> which makes it all the more complicated, but the footprint is
> always the same. We write ffffffff00000000 to freed memory.

DEBUG_PAGEALLOC + a small slab patch to force the 2k slab to be
only a single object per page (so that a kfree() immediately
triggers an unmap) would catch it I guess.

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