Re: doublefault debugging (was Re: Linux v2.5.62 --- spontaneous reboots)

William Lee Irwin III (wli@holomorphy.com)
Thu, 20 Feb 2003 04:12:16 -0800

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On Thu, Feb 20, 2003 at 12:46:51PM +0100, Ingo Molnar wrote:
> i think i managed to trigger a potentially useful oops, with BK-curr:
> Stack: c02dd6ac 0000002b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b8b 6b6b6b6b 6b6b6b6b
> 6b6b6b6b 00030001 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b
> 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b 6b6b6b6b

Looks like some kind of serious use-after-free slab issue. IF is clear,
so we aren't under spin_lock_irq(&rq->lock) on the initial fault. It
might be interesting to find a way to trap it earlier. Reproducible?
If so, how?

-- wli
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