I'm getting a segfault after d87f99e297d5 (SubinterpreterTest.test_subinterps).

$ ./python -m test test_capi
Run tests sequentially
0:00:00 [1/1] test_capi
Fatal Python error: Segmentation fault

Current thread 0x00007fd5e401d700 (most recent call first):
  File "/home/berker/projects/cpython/default/Lib/test/support/__init__.py", line 2440 in run_in_subinterp
  File "/home/berker/projects/cpython/default/Lib/test/test_capi.py", line 337 in test_subinterps
  File "/home/berker/projects/cpython/default/Lib/unittest/case.py", line 600 in run
  File "/home/berker/projects/cpython/default/Lib/unittest/case.py", line 648 in __call__
  File "/home/berker/projects/cpython/default/Lib/unittest/suite.py", line 122 in run
  File "/home/berker/projects/cpython/default/Lib/unittest/suite.py", line 84 in __call__
  File "/home/berker/projects/cpython/default/Lib/unittest/suite.py", line 122 in run
  File "/home/berker/projects/cpython/default/Lib/unittest/suite.py", line 84 in __call__
  File "/home/berker/projects/cpython/default/Lib/unittest/suite.py", line 122 in run
  File "/home/berker/projects/cpython/default/Lib/unittest/suite.py", line 84 in __call__
  File "/home/berker/projects/cpython/default/Lib/test/support/__init__.py", line 1704 in run
  File "/home/berker/projects/cpython/default/Lib/test/support/__init__.py", line 1805 in _run_suite
  File "/home/berker/projects/cpython/default/Lib/test/support/__init__.py", line 1839 in run_unittest
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/runtest.py", line 179 in test_runner
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/runtest.py", line 180 in runtest_inner
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/runtest.py", line 144 in runtest
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/main.py", line 334 in run_tests_sequential
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/main.py", line 406 in run_tests
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/main.py", line 466 in _main
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/main.py", line 446 in main
  File "/home/berker/projects/cpython/default/Lib/test/libregrtest/main.py", line 508 in main
  File "/home/berker/projects/cpython/default/Lib/test/__main__.py", line 2 in <module>
  File "/home/berker/projects/cpython/default/Lib/runpy.py", line 85 in _run_code
  File "/home/berker/projects/cpython/default/Lib/runpy.py", line 184 in _run_module_as_main
Segmentation fault (core dumped)

See also http://buildbot.python.org/all/builders/s390x%20RHEL%203.x/builds/1387/steps/test/logs/stdio for the same failure on buildbots.