The uffd-stress (userfaultfd kselftest) is failing on some boxes due to an invalid MiB allocation request:

1. ----------------------------------
2. running ./uffd-stress hugetlb 8 32
3. ----------------------------------
4. ERROR: invalid MiB (errno=9, @uffd-stress.c:457)
6. Usage: ./uffd-stress <test type> <MiB> <bounces>
8. Supported <test type>: anon, hugetlb, hugetlb-private, shmem, shmem-private
10. Examples:
12. # Run anonymous memory test on 100MiB region with 99999 bounces:
13. ./uffd-stress anon 100 99999
15. # Run share memory test on 1GiB region with 99 bounces:
16. ./uffd-stress shmem 1000 99
18. # Run hugetlb memory test on 256MiB region with 50 bounces:
19. ./uffd-stress hugetlb 256 50
21. # Run the same hugetlb test but using private file:
22. ./uffd-stress hugetlb-private 256 50
24. # 10MiB-~6GiB 999 bounces anonymous test, continue forever unless an error triggers
25. while ./uffd-stress anon $[RANDOM % 6000 + 10] 999; do true; done
27. [FAIL]
    not ok 3 uffd-stress hugetlb 8 32 # exit=1

Example test failure:
https://datawarehouse.cki-project.org/kcidb/tests/15877723