`make test` fails on Linux (Ubuntu20.04) ext4 with mounted ntfs

[IljaManakov]

I have a dual-boot setup, where my Ubuntu 20.04 is on a ext4 FS and I have a data partition that is ntfs (for compat with Windows). When I check out and build cpython on the data partition a bunch of tests fail with an OSError. It seems to be related to the fact that the test suite creates the filenames as bytes assuming "utf-8" but ntfs uses "utf-16".

I have attached the log of the test run, which shows the failing tests.

P.S.: I also have encrypted the data partition with Veracrypt but I don't expect this to be relevant for this issue (but one never knows) test_log.txt

cc @encukou