Messages in this thread | | | Date | Fri, 18 Jul 2008 12:15:26 +0300 | From | "Pekka Enberg" <> | Subject | Re: [bug, netconsole, SLUB] BUG skbuff_head_cache: Poison overwritten |
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Hi Ingo,
On Fri, Jul 18, 2008 at 12:09 PM, Ingo Molnar <mingo@elte.hu> wrote: > yeah, we want to check use-after free at the next allocation point - > i.e. as late as possible to gather all corruptions that happened > meanwhile. > > We could in theory have a SLUB debug mode where a SCHED_IDLE kernel > thread would periodically check all free objects (of that CPU) in the > background to ensure their integrity. That would catch corruptions > sooner, with a possibly still meaningful context to print out. [right > after the IRQ or process that corrupts them finishes running] > > It could also be hooked into ftrace to print out the last few hundred > kernel function calls executed prior any corruption. ftrace/slub-debug > plugin perhaps?
Well, there's this Norwegian guy, Vegard, who has written a small piece of code that can detect use-after-free _as it happens_. I think he calls the thing kmemcheck :-).
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