[Question] ksm: rmap_item pointing to some stale vmas
From: Susheel Khiani
Date: Thu Apr 09 2015 - 10:06:06 EST
We are seeing an issue during try_to_unmap_ksm where in call to
try_to_unmap_one is failing.
try_to_unmap_ksm in this particular case is trying to go through vmas
associated with each rmap_item->anon_vma. What we see is this that the
corresponding page is not mapped to any of the vmas associated with 2
The associated rmap_item in this case looks like pointing to some valid
vma but the said page is not found to be mapped under it.
try_to_unmap_one thus fails to find valid ptes for these vmas.
At the same time we can see that the page actually is mapped in 2
separate and different vmas which are not part of rmap_item associated
So whether rmap_item is pointing to some stale vmas and now the mapping
has changed? Or there is something else going on here.
Any pointer would be appreciated.
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