The "improved" output after getting back to "latest" commit:

== CPython 3.8.0a0 (heads/master-dirty:34ae04f74d, Dec 27 2018, 14:05:08) [C]
== AIX-1-00C291F54C00-powerpc-32bit big-endian
== cwd: /data/prj/python/python3-3.8/build/test_python_13566116
== CPU count: 8
== encodings: locale=ISO8859-1, FS=iso8859-1
Run tests sequentially
0:00:00 [1/1] test_eintr
test_all (test.test_eintr.EINTRTests) ...
--- run eintr_tester.py ---
test_flock (__main__.FNTLEINTRTest) ... ok
test_lockf (__main__.FNTLEINTRTest) ... ERROR
test_read (__main__.OSEINTRTest) ... ok
test_wait (__main__.OSEINTRTest) ... ok
test_wait3 (__main__.OSEINTRTest) ... ok
test_wait4 (__main__.OSEINTRTest) ... ok
test_waitpid (__main__.OSEINTRTest) ... ok
test_write (__main__.OSEINTRTest) ... ok
test_devpoll (__main__.SelectEINTRTest) ... skipped 'need select.devpoll'
test_epoll (__main__.SelectEINTRTest) ... skipped 'need select.epoll'
test_kqueue (__main__.SelectEINTRTest) ... skipped 'need select.kqueue'
test_poll (__main__.SelectEINTRTest) ... ok
test_select (__main__.SelectEINTRTest) ... ok
test_sigtimedwait (__main__.SignalEINTRTest) ... ok
test_sigwaitinfo (__main__.SignalEINTRTest) ... ok
test_accept (__main__.SocketEINTRTest) ... ok
test_open (__main__.SocketEINTRTest) ... ok
test_os_open (__main__.SocketEINTRTest) ... ok
test_recv (__main__.SocketEINTRTest) ... ok
test_recvmsg (__main__.SocketEINTRTest) ... ok
test_send (__main__.SocketEINTRTest) ... ok
test_sendall (__main__.SocketEINTRTest) ... ok
test_sendmsg (__main__.SocketEINTRTest) ... ok
test_sleep (__main__.TimeEINTRTest) ... ok

======================================================================
ERROR: test_lockf (__main__.FNTLEINTRTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/data/prj/python/git/python3-3.8/Lib/test/eintrdata/eintr_tester.py", line 522, in test_lockf
    self._lock(fcntl.lockf, "lockf")
  File "/data/prj/python/git/python3-3.8/Lib/test/eintrdata/eintr_tester.py", line 507, in _lock
    lock_func(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
PermissionError: [Errno 13] Permission denied

----------------------------------------------------------------------
Ran 24 tests in 8.822s

FAILED (errors=1, skipped=3)
--- eintr_tester.py completed: exit code 1 ---
FAIL

======================================================================
FAIL: test_all (test.test_eintr.EINTRTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/data/prj/python/git/python3-3.8/Lib/test/test_eintr.py", line 31, in test_all
    self.fail("eintr_tester.py failed")
AssertionError: eintr_tester.py failed

----------------------------------------------------------------------

Ran 1 test in 9.392s

FAILED (failures=1)
test test_eintr failed
test_eintr failed

== Tests result: FAILURE ==

1 test failed:
    test_eintr

Total duration: 9 sec 609 ms
Tests result: FAILURE