Eric, it looks like your recent commit introduced a refleak.  We need to fix it before beta2.

~/d/p/cpython (master $) » ./python.exe -m test -R3:3 test_multiprocessing_fork
Run tests sequentially
0:00:00 load avg: 2.52 [1/1] test_multiprocessing_fork
beginning 6 repetitions
123456
......
test_multiprocessing_fork leaked [21, 2, 1] memory blocks, sum=24
test_multiprocessing_fork leaked [2, 0, 0] file descriptors, sum=2
test_multiprocessing_fork failed in 9 min 48 sec

1 test failed:
    test_multiprocessing_fork


And just before it:


~/d/p/cpython ((bd093355…) $) » ./python.exe -m test -R3:3 test_multiprocessing_fork
Run tests sequentially
0:00:00 load avg: 3.70 [1/1] test_multiprocessing_fork
beginning 6 repetitions
123456
......
test_multiprocessing_fork passed in 9 min 12 sec
1 test OK.

Total duration: 9 min 12 sec
Tests result: SUCCESS