test_multiprocessing_spawn.test_notify_all() also hangs on "AMD64 Debian root 3.x" buildbot:

http://buildbot.python.org/all/builders/AMD64%20Debian%20root%203.x/builds/1959/steps/test/logs/stdio
---
[330/393] test_multiprocessing_spawn
Timeout (1:00:00)!
Thread 0x00002b303f269700 (most recent call first):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/multiprocessing/synchronize.py", line 262 in wait
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/_test_multiprocessing.py", line 834 in f
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 871 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 923 in _bootstrap_inner
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 891 in _bootstrap

Thread 0x00002b303d918700 (most recent call first):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/multiprocessing/synchronize.py", line 262 in wait
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/_test_multiprocessing.py", line 834 in f
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 871 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 923 in _bootstrap_inner
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 891 in _bootstrap

Thread 0x00002b3060947700 (most recent call first):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/multiprocessing/synchronize.py", line 262 in wait
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/_test_multiprocessing.py", line 834 in f
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 871 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 923 in _bootstrap_inner
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/threading.py", line 891 in _bootstrap

Thread 0x00002b303289db20 (most recent call first):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/_test_multiprocessing.py", line 933 in test_notify_all
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/case.py", line 577 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/case.py", line 625 in __call__
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 122 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 84 in __call__
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 122 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 84 in __call__
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 122 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/suite.py", line 84 in __call__
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/unittest/runner.py", line 176 in run
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/support/__init__.py", line 1773 in _run_suite
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/support/__init__.py", line 1807 in run_unittest
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/regrtest.py", line 1283 in test_runner
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/regrtest.py", line 1284 in runtest_inner
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/regrtest.py", line 967 in runtest
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/regrtest.py", line 763 in main
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/regrtest.py", line 1568 in main_in_temp_cwd
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/__main__.py", line 3 in <module>
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/runpy.py", line 85 in _run_code
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/runpy.py", line 170 in _run_module_as_main
---