diff -r 9efefcab817e Lib/test/test_posix.py
--- a/Lib/test/test_posix.py	Fri Sep 12 10:39:48 2014 -0400
+++ b/Lib/test/test_posix.py	Fri Sep 12 11:09:45 2014 -0700
@@ -231,7 +231,9 @@
         except OSError as inst:
             # issue10812, ZFS doesn't appear to support posix_fallocate,
             # so skip Solaris-based since they are likely to have ZFS.
-            if inst.errno != errno.EINVAL or not sys.platform.startswith("sunos"):
+            # issue10812, AIX does not support fadvise when _LARGE_FILES
+            # is defined because off_t is passed as the wrong size.
+            if inst.errno != errno.EINVAL or (not sys.platform.startswith("sunos") and not sys.platform.startswith("aix")):
                 raise
         finally:
             os.close(fd)
@@ -242,6 +244,11 @@
         fd = os.open(support.TESTFN, os.O_RDONLY)
         try:
             posix.posix_fadvise(fd, 0, 0, posix.POSIX_FADV_WILLNEED)
+        except OSError as inst:
+            # issue10812, AIX does not support fadvise when _LARGE_FILES
+            # is defined because off_t is passed as the wrong size.
+            if inst.errno != errno.EINVAL or not sys.platform.startswith("aix"):
+                raise
         finally:
             os.close(fd)