11 Jul
2020
11 Jul
'20
6:21 p.m.
On Sat, Jul 11, 2020 at 11:12 AM Linus Torvalds torvalds@linux-foundation.org wrote:
The fact that it seems to happen with
https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/thp/thp01.cmakes me think it's somehow related to THP mappings, but I don't see why those would matter. All the same pmd freeing should still have happened, afaik.
No, I think the only reason it happens with that test-case is simply because that test-case tests many different argument sizes, and as part of that it ends up then hitting the "stack is exactly one pmd in size" case when the stack alignment is right too.
So the THP part is almost certainly a red herring.
Maybe. Considering that I don't see what's wrong, anything is possible.
Linus