Messages in this thread | | | Date | Wed, 2 Aug 2006 00:22:00 -0400 | From | Dave Jones <> | Subject | Re: frequent slab corruption (since a long time) |
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On Wed, Aug 02, 2006 at 05:37:28AM +0200, Andi Kleen wrote: > Dave Jones <davej@redhat.com> 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.
Problem with that approach is that DEBUG_PAGEALLOC makes things so damned slow that it's pretty much unusable, and this bug doesn't seem to want to repeat itself to order, so I doubt many people would put up with the slowdown long enough to chase it down.
Dave
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