STINNER Victor <victor.stin...@haypocalc.com> added the comment:

The initial problem was test_3_join_in_forked_from_thread() and the hangs does 
still happen:

[324/356] test_threading
Timeout (1:00:00)!
Thread 0x404248c0:
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/subprocess.py", line 
1498 in _communicate_with_poll
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/subprocess.py", line 
1423 in _communicate
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/subprocess.py", line 
836 in communicate
  File 
"/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/script_helper.py", 
line 32 in _assert_python
  File 
"/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/script_helper.py", 
line 50 in assert_python_ok
  File 
"/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_threading.py", 
line 434 in _run_and_join
  File 
"/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_threading.py", 
line 493 in test_3_join_in_forked_from_thread
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/case.py", 
line 407 in _executeTestPart
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/case.py", 
line 462 in run
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/case.py", 
line 514 in __call__
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/suite.py", 
line 105 in run
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/suite.py", 
line 67 in __call__
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/suite.py", 
line 105 in run
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/suite.py", 
line 67 in __call__
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/unittest/runner.py", 
line 168 in run
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/support.py", 
line 1259 in _run_suite
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/support.py", 
line 1285 in run_unittest
  File 
"/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_threading.py", 
line 774 in test_main
  File "./Lib/test/regrtest.py", line 1070 in runtest_inner
  File "./Lib/test/regrtest.py", line 861 in runtest
  File "./Lib/test/regrtest.py", line 669 in main
  File "./Lib/test/regrtest.py", line 1648 in <module>

http://www.python.org/dev/buildbot/all/builders/x86%20Ubuntu%20Shared%203.x/builds/4081/steps/test/logs/stdio

(neologix's patch doesn't change anything for x86 Ubuntu Shared 3.x buildbot, 
which is a Linux, not a FreeBSD)

I don't know why it only hangs on this Linux buildbot. It's maybe an old Linux 
kernel, an old GNU libc version, or something like that?

----------

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<http://bugs.python.org/issue11870>
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