I added a few prints to the send and receive loops of _test_send.  When running on a reasonably current Debian testing Linux:

./python Lib/test/eintrdata/eintr_tester.py
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_accept (__main__.SocketEINTRTest) ... ok
test_recv (__main__.SocketEINTRTest) ... ok
test_recvmsg (__main__.SocketEINTRTest) ... ok
test_send (__main__.SocketEINTRTest) ... len(data) = 50331651
 sent = 183360, written = 183360
 sent = 50148291, written = 50331651
 chunk = 50331651, total read = 50331651
ok
test_sendall (__main__.SocketEINTRTest) ... len(data) = 50331651
 chunk = 49323840, total read = 49323840
 sent = None, written = 50331651
 chunk = 1007811, total read = 50331651
ok
test_sendmsg (__main__.SocketEINTRTest) ... len(data) = 50331651
 sent = 183360, written = 183360
 sent = 50148291, written = 50331651
 chunk = 50331651, total read = 50331651
ok

----------------------------------------------------------------------
Ran 12 tests in 10.139s

OK

When run on OS X (10.10.1):

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_accept (__main__.SocketEINTRTest) ... ok
test_recv (__main__.SocketEINTRTest) ... ok
test_recvmsg (__main__.SocketEINTRTest) ... ok
test_send (__main__.SocketEINTRTest) ... len(data) = 50331651
 sent = 8192, written = 8192
 chunk = 8192, total read = 8192
 chunk = 8192, total read = 16384
 sent = 16384, written = 24576
 chunk = 8192, total read = 24576
 chunk = 8192, total read = 32768
 chunk = 8192, total read = 40960
 chunk = 8192, total read = 49152
 sent = 32768, written = 57344
 chunk = 8192, total read = 57344
 chunk = 8192, total read = 65536
 chunk = 8192, total read = 73728
 chunk = 8192, total read = 81920
 chunk = 8192, total read = 90112
 sent = 40960, written = 98304
 chunk = 8192, total read = 98304
 chunk = 8192, total read = 106496
 chunk = 8192, total read = 114688
 chunk = 8192, total read = 122880
 sent = 32768, written = 131072
 chunk = 8192, total read = 131072
 chunk = 8192, total read = 139264
 chunk = 8192, total read = 147456
 chunk = 8192, total read = 155648
 chunk = 8192, total read = 163840
 sent = 40960, written = 172032
 chunk = 8192, total read = 172032
 chunk = 8192, total read = 180224
 chunk = 8192, total read = 188416
 chunk = 8192, total read = 196608
 sent = 32768, written = 204800
 chunk = 8192, total read = 204800
 chunk = 8192, total read = 212992
 chunk = 8192, total read = 221184
 chunk = 8192, total read = 229376
 chunk = 8192, total read = 237568
 sent = 40960, written = 245760
 chunk = 8192, total read = 245760
 chunk = 8192, total read = 253952
 chunk = 8192, total read = 262144
 chunk = 8192, total read = 270336
 sent = 32768, written = 278528
 chunk = 8192, total read = 278528
 chunk = 8192, total read = 286720
 chunk = 8192, total read = 294912
 chunk = 8192, total read = 303104
 chunk = 8192, total read = 311296
 sent = 40960, written = 319488
[... and so on]

When run standalone, the tests do eventually finish without error but take a *long* time to do so.