[New-bugs-announce] [issue11738] ThreadSignals.test_signals() of test_threadsignals hangs on PPC Tiger 3.x buildbot

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at haypocalc.com>:

Thanks to the new faulthandler module (#11393) and regrtest timeout (#11727, timeout of 15 minutes), I finally found why test_threadsignals hangs on PPC Tiger 3.x:
-------------------------------------
...
[ 25/354] test_threadsignals
Thread 0xa000ed88:
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/test/test_threadsignals.py", line 46 in test_signals
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/case.py", line 387 in _executeTestPart
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/case.py", line 442 in run
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/case.py", line 494 in __call__
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/suite.py", line 105 in run
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/suite.py", line 67 in __call__
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/suite.py", line 105 in run
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/unittest/suite.py", line 67 in __call__
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/test/support.py", line 1078 in run
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/test/support.py", line 1166 in _run_suite
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/test/support.py", line 1192 in run_unittest
  File "/Users/buildbot/buildarea/3.x.parc-tiger-1/build/Lib/test/test_threadsignals.py", line 210 in test_main
  File "./Lib/test/regrtest.py", line 1032 in runtest_inner
  File "./Lib/test/regrtest.py", line 826 in runtest
  File "./Lib/test/regrtest.py", line 650 in main
  File "./Lib/test/regrtest.py", line 1607 in <module>
make: *** [buildbottest] Error 1
program finished with exit code 2
elapsedTime=1103.489396
-------------------------------------
http://www.python.org/dev/buildbot/all/builders/PPC%20Tiger%203.x/builds/1685/steps/test/logs/stdio

test_threadsignals hangs at:
----------------
class ThreadSignals(unittest.TestCase):
    def test_signals(self):
        signalled_all.acquire()
        self.spawnSignallingThread()
        signalled_all.acquire() <~~~~ here
        ...
----------------

self.spawnSignallingThread() calls:
----------------
def send_signals():
    os.kill(process_pid, signal.SIGUSR1)
    os.kill(process_pid, signal.SIGUSR2)
    signalled_all.release()
----------------

Before fixing the bug, we can workaroung the hang in the test using a timeout on the second acquire.

This issue may be related to #11223.

----------
assignee: ronaldoussoren
components: Interpreter Core, Macintosh, Tests
keywords: buildbot
messages: 132748
nosy: haypo, pitrou, ronaldoussoren, sable
priority: normal
severity: normal
status: open
title: ThreadSignals.test_signals() of test_threadsignals hangs on PPC Tiger 3.x buildbot
versions: Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11738>
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