STINNER Victor <vstin...@redhat.com> added the comment:
Hum, I succeeded to reproduce a hang in test_io using the command:
***
buildbot@stormageddon ~/python27 $ ./python -m test -v -m 'test_interrupted*'
-F test_io
(...)
0:04:38 load avg: 3.36 [ 44] test_io
test_interrupted_write_buffered (test.test_io.CSignalsTest) ... ok
test_interrupted_write_text (test.test_io.CSignalsTest) ... ok
test_interrupted_write_unbuffered (test.test_io.CSignalsTest) ... ok
test_interrupted_write_buffered (test.test_io.PySignalsTest) ... ok
test_interrupted_write_text (test.test_io.PySignalsTest) ... ok
test_interrupted_write_unbuffered (test.test_io.PySignalsTest) ... ok
----------------------------------------------------------------------
Ran 6 tests in 6.167s
OK
0:04:45 load avg: 3.65 [ 45] test_io
test_interrupted_write_buffered (test.test_io.CSignalsTest) ... ok
test_interrupted_write_text (test.test_io.CSignalsTest) ... ok
test_interrupted_write_unbuffered (test.test_io.CSignalsTest) ... ok
test_interrupted_write_buffered (test.test_io.PySignalsTest) ... ok
test_interrupted_write_text (test.test_io.PySignalsTest) ...
***
Traces in gdb of the stuck process:
***
(gdb) py-bt
Traceback (most recent call first):
Waiting for the GIL
<built-in method acquire of thread.lock object at remote 0xb6c09258>
File "/buildbot/python27/Lib/threading.py", line 340, in wait
waiter.acquire()
File "/buildbot/python27/Lib/threading.py", line 940, in join
self.__block.wait()
File "/buildbot/python27/Lib/test/test_io.py", line 3161, in
check_interrupted_write
t.join()
File "/buildbot/python27/Lib/test/test_io.py", line 3186, in
test_interrupted_write_text
self.check_interrupted_write("xy", b"xy", mode="w", encoding="ascii")
File "/buildbot/python27/Lib/unittest/case.py", line 329, in run
testMethod()
File "/buildbot/python27/Lib/unittest/case.py", line 393, in __call__
return self.run(*args, **kwds)
File "/buildbot/python27/Lib/unittest/suite.py", line 108, in run
test(result)
File "/buildbot/python27/Lib/unittest/suite.py", line 70, in __call__
return self.run(*args, **kwds)
File "/buildbot/python27/Lib/unittest/suite.py", line 108, in run
test(result)
File "/buildbot/python27/Lib/unittest/suite.py", line 70, in __call__
return self.run(*args, **kwds)
File "/buildbot/python27/Lib/unittest/runner.py", line 151, in run
test(result)
File "/buildbot/python27/Lib/test/support/__init__.py", line 1535, in
_run_suite
result = runner.run(suite)
File "/buildbot/python27/Lib/test/support/__init__.py", line 1626, in
run_unittest
_run_suite(suite)
File "/buildbot/python27/Lib/test/test_io.py", line 3367, in test_main
support.run_unittest(*tests)
File "/buildbot/python27/Lib/test/regrtest.py", line 1236, in runtest_inner
indirect_test()
File "/buildbot/python27/Lib/test/regrtest.py", line 1044, in runtest
return runtest_inner(test, verbose, quiet, huntrleaks, pgo, testdir)
File "/buildbot/python27/Lib/test/regrtest.py", line 837, in local_runtest
testdir=testdir)
File "/buildbot/python27/Lib/test/regrtest.py", line 851, in main
result = local_runtest()
File "/buildbot/python27/Lib/test/regrtest.py", line 2025, in main_in_temp_cwd
main()
File "/buildbot/python27/Lib/test/__main__.py", line 3, in <module>
regrtest.main_in_temp_cwd()
File "/buildbot/python27/Lib/runpy.py", line 72, in _run_code
exec code in run_globals
File "/buildbot/python27/Lib/runpy.py", line 174, in _run_module_as_main
"__main__", fname, loader, pkg_name)
(gdb) info threads
Id Target Id Frame
* 1 Thread 0xb7518700 (LWP 14442) "python" 0xb7772b49 in __kernel_vsyscall ()
2 Thread 0xb6b36b40 (LWP 18865) "python" 0xb7772b49 in __kernel_vsyscall ()
(gdb) t 2
[Switching to thread 2 (Thread 0xb6b36b40 (LWP 18865))]
#0 0xb7772b49 in __kernel_vsyscall ()
(gdb) py-bt
Traceback (most recent call first):
<built-in function read>
File "/buildbot/python27/Lib/test/test_io.py", line 3141, in _read
s = os.read(r, 1)
File "/buildbot/python27/Lib/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/buildbot/python27/Lib/threading.py", line 801, in __bootstrap_inner
self.run()
File "/buildbot/python27/Lib/threading.py", line 774, in __bootstrap
self.__bootstrap_inner()
***
And now I recall how much I hate this test. It made me crazy in Python 2 for a
long time.
This specific test was my motiviation to add signal.pthread_sigmask() to Python
3.3.
Note: I also implemented the PEP 475 in Python 3.5 to make Python more reliable
when getting signals.
----------
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<https://bugs.python.org/issue31731>
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