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    SubjectRe: Ugly rmap NULL ptr deref oopsie on hibernate (was Linux 2.6.34-rc3)
    On 04/06/2010 06:09 AM, KOSAKI Motohiro wrote:
    >> (b) is also impossible. SLAB_DESTROY_BY_RCU delay the page for anon_vma
    >> freeing until next rcu period. It mean rcu_read_lock()+page_mapped()
    >> can see kfree()ed page. but it is safe. noone corrupt it.
    > by the way: I haven't understand why rik's per process anon_vma concept
    > works correctly with ksm. ksm increase anon_vma->ksm_refcount. but it seems
    > not guranteed vma->anon_vma and page->anon_vma are the same.

    KSM removes the page from its original anon_vma.

    If the page gets reinstantiated (copy on write), it will be
    created in the vma->anon_vma.

    Am I overlooking something?

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      Last update: 2010-04-06 16:39    [W:0.020 / U:6.348 seconds]
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