Re: [PATCH 04/14] mm,migration: Allow the migration of PageSwapCachepages

[Christoph Lameter]

On Thu, 22 Apr 2010, Mel Gorman wrote:

> vma_adjust() is updating anon VMA information without any locks taken.
> In constract, file-backed mappings use the i_mmap_lock. This lack of
> locking can result in races with page migration. During rmap_walk(),
> vma_address() can return -EFAULT for an address that will soon be valid.
> This leaves a dangling migration PTE behind which can later cause a
> BUG_ON to trigger when the page is faulted in.

Isnt this also a race with reclaim /  swap?
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