OK. There have been some comments/questions re:PR18282.a) my PR is missing that PR, seems we just missed each other.b) when using my patch I took a suggestion fromissue39460 to test again:root@x065:[/home/python/python3-3.9]./python -m test -v test_zipfile -m test_add_file_after_2107 --tempdir /tmp== CPython 3.9.0a3+ (heads/bpo-39502-dirty:c54fe56362, Jan 30 2020, 15:52:37) [C]== AIX-3-00C291F54C00-powerpc-64bit big-endian== cwd: /tmp/test_python_303120== CPU count: 4== encodings: locale=ISO8859-1, FS=iso8859-10:00:00 Run tests sequentially0:00:00 [1/1] test_zipfiletest_add_file_after_2107 (test.test_zipfile.StoredTestsWithSourceFile) ... ok----------------------------------------------------------------------Ran 1 test in 0.257sOK== Tests result: SUCCESS ==1 test OK.Total duration: 653 msTests result: SUCCESSWithout the --tempdir setting it "skips" to PASS:root@x065:[/home/python/python3-3.9]./python -m test -v test_zipfile -m test_add_file_after_2107== CPython 3.9.0a3+ (heads/bpo-39502-dirty:c54fe56362, Jan 30 2020, 15:52:37) [C]== AIX-3-00C291F54C00-powerpc-64bit big-endian== cwd: /data/prj/python/python3-3.9/build/test_python_364784== CPU count: 4== encodings: locale=ISO8859-1, FS=iso8859-10:00:00 Run tests sequentially0:00:00 [1/1] test_zipfiletest_add_file_after_2107 (test.test_zipfile.StoredTestsWithSourceFile) ... skipped 'Linux VFS/XFS kernel bug detected: mtime_ns=91301504000000000'----------------------------------------------------------------------Ran 1 test in 0.010sOK (skipped=1)== Tests result: SUCCESS ==1 test OK.Total duration: 252 msTests result: SUCCESSFYI