Hey Antoine, as expected, your test fails randomly on the CI :-(

Another failure:

http://buildbot.python.org/all/builders/x86%20Gentoo%20Non-Debug%20with%20X%203.x/builds/829/steps/test/logs/stdio

test_stress_delivery_dependent (test.test_signal.StressTest) ... Timeout (0:15:00)!
Thread 0xb74bd700 (most recent call first):
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/test_signal.py", line 973 in measure_itimer_resolution
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/test_signal.py", line 985 in decide_itimer_count
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/test_signal.py", line 1001 in test_stress_delivery_dependent
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/case.py", line 615 in run
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/case.py", line 663 in __call__
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/suite.py", line 122 in run
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/suite.py", line 84 in __call__
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/suite.py", line 122 in run
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/suite.py", line 84 in __call__
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/suite.py", line 122 in run
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/suite.py", line 84 in __call__
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/unittest/runner.py", line 176 in run
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/support/__init__.py", line 1896 in _run_suite
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/support/__init__.py", line 1940 in run_unittest
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/runtest.py", line 168 in test_runner
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/runtest.py", line 169 in runtest_inner
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/runtest.py", line 137 in runtest
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/main.py", line 290 in rerun_failed_tests
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/main.py", line 540 in _main
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/main.py", line 510 in main
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/libregrtest/main.py", line 585 in main
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/test/__main__.py", line 2 in <module>
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/runpy.py", line 85 in _run_code
  File "/buildbot/buildarea/3.x.ware-gentoo-x86.nondebug/build/Lib/runpy.py", line 193 in _run_module_as_main