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test_signal.py wait_helper hangs on AIX. Please skip the test on AIX for now to allow all other tests to run to completion.
diff -r bdd60bedf933 Lib/test/test_signal.py
--- a/Lib/test/test_signal.py Sun Jun 16 18:37:53 2013 -0400
+++ b/Lib/test/test_signal.py Mon Jun 17 00:10:01 2013 -0700
@@ -593,6 +593,7 @@
 """
 assert_python_ok('-c', code)
 
+ @unittest.skipIf(sys.platform == "aix7", "Test hangs on AIX")
 @unittest.skipUnless(hasattr(signal, 'pthread_sigmask'),
 'need signal.pthread_sigmask()')
 def wait_helper(self, blocked, test):

> test_signal.py wait_helper hangs on AIX.
Why does the test hang? I prefer to only skip a test if I understood the issue (when it is not fixable in Python, like a bug in the kernel).

I understand that this is a work-around and the intention is to investigate each error in the testsuite on AIX. But currently this bug eventually leads to a timeout in the testsuite and half of the tests are not run.
I am trying to get the AIX buildbot running completely and greatly would appreciate your accommodation with this work-around during that process to make it easier for CPython developers to make another sweep through the testsuite failures to start addressing them.
This is not proposed as "skip the test and ignore it". This is proposed as an interim solution to make progress on the buildbot for AIX.
Again, I would greatly appreciate your patience and accommodation in this request.

$ ./python -m test --timeout=60 -v test_signal
== CPython 3.4.0a0 (default:00824f9e29f3+, Jun 17 2013, 16:44:41) [GCC 4.8.1]
== AIX-1-00F84C0C4C00-powerpc-32bit big-endian
== /home/dje/src/cpython/build/test_python_5832942
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1)
[1/1] test_signal
test_getsignal (test.test_signal.PosixTests) ... ok
test_out_of_range_signal_number_raises_error (test.test_signal.PosixTests) ... ok
test_setting_signal_handler_to_none_raises_error (test.test_signal.PosixTests) ... ok
test_main (test.test_signal.InterProcessSignalTests) ... ok
test_invalid_fd (test.test_signal.WakeupFDTests) ... ok
test_pending (test.test_signal.WakeupSignalTests) ... ok
test_signum (test.test_signal.WakeupSignalTests) ... ok
test_wakeup_fd_during (test.test_signal.WakeupSignalTests) ... ok
test_wakeup_fd_early (test.test_signal.WakeupSignalTests) ... ok
test_siginterrupt_off (test.test_signal.SiginterruptTest) ... ok
test_siginterrupt_on (test.test_signal.SiginterruptTest) ... ok
test_without_siginterrupt (test.test_signal.SiginterruptTest) ... ok
test_itimer_exc (test.test_signal.ItimerTest) ... ok
test_itimer_prof (test.test_signal.ItimerTest) ... ok
test_itimer_real (test.test_signal.ItimerTest) ... ok
test_itimer_virtual (test.test_signal.ItimerTest) ... ok
test_issue9324 (test.test_signal.WindowsSignalTests) ... skipped 'Windows specific'
test_pthread_kill (test.test_signal.PendingSignalsTests) ... ok
test_pthread_kill_main_thread (test.test_signal.PendingSignalsTests) ... ok
test_pthread_sigmask (test.test_signal.PendingSignalsTests) ... ok
test_pthread_sigmask_arguments (test.test_signal.PendingSignalsTests) ... ok
test_sigpending (test.test_signal.PendingSignalsTests) ... ok
test_sigpending_empty (test.test_signal.PendingSignalsTests) ... ok
test_sigtimedwait (test.test_signal.PendingSignalsTests) ... ok
test_sigtimedwait_negative_timeout (test.test_signal.PendingSignalsTests) ... ok
test_sigtimedwait_poll (test.test_signal.PendingSignalsTests) ... ok
test_sigtimedwait_timeout (test.test_signal.PendingSignalsTests) ... ok
test_sigwait (test.test_signal.PendingSignalsTests) ... ok
test_sigwait_thread (test.test_signal.PendingSignalsTests) ... ok
test_sigwaitinfo (test.test_signal.PendingSignalsTests) ... ok
test_sigwaitinfo_interrupted (test.test_signal.PendingSignalsTests) ... Timeout (0:01:00)!
Thread 0x00000001:
 File "/home/dje/src/cpython/Lib/subprocess.py", line 1613 in _communicate_with_poll
 File "/home/dje/src/cpython/Lib/subprocess.py", line 1533 in _communicate
 File "/home/dje/src/cpython/Lib/subprocess.py", line 943 in communicate
 File "/home/dje/src/cpython/Lib/test/script_helper.py", line 36 in _assert_python
 File "/home/dje/src/cpython/Lib/test/script_helper.py", line 54 in assert_python_ok
 File "/home/dje/src/cpython/Lib/test/test_signal.py", line 639 in wait_helper
 File "/home/dje/src/cpython/Lib/test/test_signal.py", line 726 in test_sigwaitinfo_interrupted
 File "/home/dje/src/cpython/Lib/unittest/case.py", line 496 in run
 File "/home/dje/src/cpython/Lib/unittest/case.py", line 535 in __call__
 File "/home/dje/src/cpython/Lib/unittest/suite.py", line 105 in run
 File "/home/dje/src/cpython/Lib/unittest/suite.py", line 67 in __call__
 File "/home/dje/src/cpython/Lib/unittest/suite.py", line 105 in run
 File "/home/dje/src/cpython/Lib/unittest/suite.py", line 67 in __call__
 File "/home/dje/src/cpython/Lib/unittest/runner.py", line 168 in run
 File "/home/dje/src/cpython/Lib/test/support.py", line 1566 in _run_suite
 File "/home/dje/src/cpython/Lib/test/support.py", line 1600 in run_unittest
 File "/home/dje/src/cpython/Lib/test/test_signal.py", line 873 in test_main
 File "/home/dje/src/cpython/Lib/test/regrtest.py", line 1307 in runtest_inner
 File "/home/dje/src/cpython/Lib/test/regrtest.py", line 1011 in runtest
 File "/home/dje/src/cpython/Lib/test/regrtest.py", line 798 in main
 File "/home/dje/src/cpython/Lib/test/regrtest.py", line 1592 in main_in_temp_cwd
 File "/home/dje/src/cpython/Lib/test/__main__.py", line 3 in <module>
 File "/home/dje/src/cpython/Lib/runpy.py", line 73 in _run_code
 File "/home/dje/src/cpython/Lib/runpy.py", line 160 in _run_module_as_main

By the way, if I manually override _has_poll to False, the same test fails similarly in _communicate_with_select, so the failure is not limited to the implementation of poll().

New changeset a0e234e10da6 by Victor Stinner in branch '3.3':
Issue #18238: Skip test_signal.test_sigwaitinfo_interrupted() on AIX
http://hg.python.org/cpython/rev/a0e234e10da6
New changeset 8e277e6bd11b by Victor Stinner in branch 'default':
(Merge 3.3) Issue #18238: Skip test_signal.test_sigwaitinfo_interrupted() on AIX
http://hg.python.org/cpython/rev/8e277e6bd11b 

This needs to be backported to Python 2.7 as well.

> This needs to be backported to Python 2.7 as well.
signal.sigwaitinfo() was added to Python 3.3 (and doesn't exist in Python 2).