test_pdb_interaction hangs

[stanislavlevin]

Python 3.5 testing/test_pdb.py::TestPDB::test_pdb_interaction just hangs.

testing/test_pdb.py::TestPDB::test_pdb_on_fail PASSED                                   [ 45%]
testing/test_pdb.py::TestPDB::test_pdb_on_xfail PASSED                                  [ 45%]
testing/test_pdb.py::TestPDB::test_pdb_on_skip PASSED                                   [ 45%]
testing/test_pdb.py::TestPDB::test_pdb_on_BdbQuit PASSED                                [ 45%]
testing/test_pdb.py::TestPDB::test_pdb_interaction  

backtrace.log

PDB tests without other are PASSED:

pytest3 testing -v --fulltrace -k test_pdb
===================================== test session starts =====================================
platform linux -- Python 3.5.4, pytest-3.4.2, py-1.5.2, pluggy-0.6.0 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /usr/src/RPM/BUILD/python3, inifile: tox.ini
plugins: hypothesis-3.18.1
testing/test_pdb.py::TestPDB::test_pdb_on_fail PASSED                                   [  3%]
testing/test_pdb.py::TestPDB::test_pdb_on_xfail PASSED                                  [  7%]
testing/test_pdb.py::TestPDB::test_pdb_on_skip PASSED                                   [ 11%]
testing/test_pdb.py::TestPDB::test_pdb_on_BdbQuit PASSED                                [ 15%]
testing/test_pdb.py::TestPDB::test_pdb_interaction PASSED                               [ 19%]
testing/test_pdb.py::TestPDB::test_pdb_unittest_postmortem PASSED                       [ 23%]
testing/test_pdb.py::TestPDB::test_pdb_unittest_skip PASSED                             [ 26%]
testing/test_pdb.py::TestPDB::test_pdb_print_captured_stdout PASSED                     [ 30%]
testing/test_pdb.py::TestPDB::test_pdb_print_captured_stderr PASSED                     [ 34%]
testing/test_pdb.py::TestPDB::test_pdb_dont_print_empty_captured_stdout_and_stderr PASSED [ 38%]
testing/test_pdb.py::TestPDB::test_pdb_interaction_exception PASSED                     [ 42%]
testing/test_pdb.py::TestPDB::test_pdb_interaction_on_collection_issue181 PASSED        [ 46%]
testing/test_pdb.py::TestPDB::test_pdb_interaction_on_internal_error PASSED             [ 50%]
testing/test_pdb.py::TestPDB::test_pdb_interaction_capturing_simple PASSED              [ 53%]
testing/test_pdb.py::TestPDB::test_pdb_set_trace_interception PASSED                    [ 57%]
testing/test_pdb.py::TestPDB::test_pdb_and_capsys PASSED                                [ 61%]
testing/test_pdb.py::TestPDB::test_set_trace_capturing_afterwards PASSED                [ 65%]
testing/test_pdb.py::TestPDB::test_pdb_interaction_doctest PASSED                       [ 69%]
testing/test_pdb.py::TestPDB::test_pdb_interaction_capturing_twice PASSED               [ 73%]
testing/test_pdb.py::TestPDB::test_pdb_used_outside_test PASSED                         [ 76%]
testing/test_pdb.py::TestPDB::test_pdb_used_in_generate_tests PASSED                    [ 80%]
testing/test_pdb.py::TestPDB::test_pdb_collection_failure_is_shown PASSED               [ 84%]
testing/test_pdb.py::TestPDB::test_enter_pdb_hook_is_called PASSED                      [ 88%]
testing/test_pdb.py::TestPDB::test_pdb_custom_cls PASSED                                [ 92%]
testing/test_pdb.py::TestPDB::test_pdb_custom_cls_without_pdb PASSED                    [ 96%]
testing/test_pdb.py::TestPDB::test_pdb_custom_cls_with_settrace PASSED                  [100%]
================== 26 passed, 2014 deselected, 28 warnings in 21.23 seconds ===================

All tests for Python2.7 are PASSED.

[pytestbot]

GitMate.io thinks possibly related issues are #2023 (subprocess tests hang), #2022 (pexpect tests hang on macOS), #889 (test_pdb_collection_failure_is_shown() hangs in PyCharm 4.5), #1290 ( @ operator lets the assertion rewrite hang up), and #1021 (test_pdb_interaction with py34-pexpect is flaky).

[RonnyPfannschmidt]

this is a known issue - duplicate of #2673

things work in tox, i havent found time to debug this mess