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test_multiprocessing segfaults in a loop. The crash occurs in _Condition.release() on waiter.release(), called from Queue._finalize_close(). Possible related changes:
 - a5c8b6ebe895: new sigwait() test using thread (issue #8407)
 - 6d6099f7fe89: add sentinels to multiprocessing (issue #9205)
Example of a crash:
[333/356/1] test_multiprocessing
Fatal Python error: Segmentation fault
Thread 0x01cde800:
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/threading.py", line 237 in wait
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/queues.py", line 252 in _feed
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/threading.py", line 690 in run
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/threading.py", line 737 in _bootstrap_inner
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/threading.py", line 710 in _bootstrap
Current thread 0xa000d000:
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/threading.py", line 298 in notify
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/queues.py", line 227 in _finalize_close
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/util.py", line 202 in __call__
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/process.py", line 270 in _bootstrap
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/forking.py", line 133 in __init__
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/process.py", line 134 in start
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/pool.py", line 220 in _repopulate_pool
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/pool.py", line 157 in __init__
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/multiprocessing/__init__.py", line 231 in Pool
 File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/test_multiprocessing.py", line 2186 in test_main
 File "./Lib/test/regrtest.py", line 1043 in runtest_inner
 File "./Lib/test/regrtest.py", line 841 in runtest
 File "./Lib/test/regrtest.py", line 668 in main
 File "./Lib/test/regrtest.py", line 1618 in <module>
There are approximatively 698 crashes in last tests on "x86 Tiger 3.x"!
http://www.python.org/dev/buildbot/all/builders/x86%20Tiger%203.x/builds/2722/steps/test/logs/stdio
Most occured on Queue._finalize_close() -> _Condition.release() -> waiter.release().