I would like to reopen this issue as it is still occurring in py3k on AIX 5.3 and 6.1:

Re-running test test_mmap in verbose mode
test_access_parameter (test.test_mmap.MmapTests) ... ERROR
test_anonymous (test.test_mmap.MmapTests) ... ok
test_bad_file_desc (test.test_mmap.MmapTests) ... ok
test_basic (test.test_mmap.MmapTests) ... ok
test_context_manager (test.test_mmap.MmapTests) ... ok
test_context_manager_exception (test.test_mmap.MmapTests) ... ok
test_double_close (test.test_mmap.MmapTests) ... ok
test_entire_file (test.test_mmap.MmapTests) ... ok
test_error (test.test_mmap.MmapTests) ... ok
test_extended_getslice (test.test_mmap.MmapTests) ... ok
test_extended_set_del_slice (test.test_mmap.MmapTests) ... ok
test_find_end (test.test_mmap.MmapTests) ... ok
test_io_methods (test.test_mmap.MmapTests) ... ok
test_move (test.test_mmap.MmapTests) ... ok
test_offset (test.test_mmap.MmapTests) ... ok
test_prot_readonly (test.test_mmap.MmapTests) ... ok
test_rfind (test.test_mmap.MmapTests) ... ok
test_subclass (test.test_mmap.MmapTests) ... ok
test_tougher_find (test.test_mmap.MmapTests) ... ok

======================================================================
ERROR: test_access_parameter (test.test_mmap.MmapTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/san_u02/home/recette/buildbot/buildbot-aix5/py3k-aix5-xlc/build/Lib/test/test_mmap.py", line 219, in test_access_parameter
    m.flush()
mmap.error: [Errno 22] Invalid argument

----------------------------------------------------------------------
Ran 19 tests in 0.216s

FAILED (errors=1)


Should flush be modified to do nothing in this case or should the unit test be updated?
thanks