OK. It fails on 4.15. The overcommit logic has changed between 5.1 and
5.2-rc1 with the following commit:

8c7829b04c523cdc732cb77f59f03320e09f3386 ("mm: fix false-positive
OVERCOMMIT_GUESS failures").

Compared to the new logic, the old one is overly complicated, and not
easy to account on the test itself. Allocating half the memory should
probably be enough for the test purpose.

Cascardo.

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https://bugs.launchpad.net/bugs/1854722

Title:
  mtest06 from mm in ubuntu_ltp failed on B-AWS-5.0 B-AWS-4.15

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