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AMD64 Windows7 SP1 3.7:
https://buildbot.python.org/all/#/builders/130/builds/935
0:23:27 load avg: 7.92 [412/416] test_plistlib passed -- running: test_venv (1 min 26 sec), test_concurrent_futures (23 min 26 sec)
0:23:32 load avg: 7.29 [413/416] test_argparse passed -- running: test_venv (1 min 31 sec), test_concurrent_futures (23 min 31 sec)
0:23:34 load avg: 7.29 [414/416] test_venv passed (1 min 32 sec) -- running: test_concurrent_futures (23 min 32 sec)
0:23:37 load avg: 6.71 [415/416] test_largefile passed -- running: test_concurrent_futures (23 min 35 sec)
running: test_concurrent_futures (24 min 6 sec)
running: test_concurrent_futures (24 min 36 sec)
...
running: test_concurrent_futures (25 hour 25 min)
running: test_concurrent_futures (25 hour 26 min)
running: test_concurrent_futures (25 hour 26 min)
running: test_concurrent_futures (25 hour 27 min)
running: test_concurrent_futures (25 hour 27 min)
running: test_concurrent_futures (25 hour 28 min)
program finished with exit code 1
elapsedTime=91968.468000

The test run was stopped by me terminating the stuck processes on the buildbot worker itself. This happens approximately once a month or so.
As of late, its been stuck in test_concurrent_futures, but it can get stuck in any test that uses multiprocessing (the spawned pool never terminates).

The root issue will be solved by bpo-37531: ensure that regrtest kills a worker process if it takes longer than TIMEOUT seconds.