$ ./python -m test -j2 test__xxsubinterpreters test__xxsubinterpreters -m test_already_running -v(...)== Python build: debug TraceRefs(...)== CPU count: 12(...)0:00:00 load avg: 1.19 Run tests in parallel using 2 child processes0:00:00 load avg: 1.19 [1/2] test__xxsubinterpreters passedtest_already_running (test.test__xxsubinterpreters.RunStringTests.test_already_running) ... ok(...)0:00:00 load avg: 1.19 [2/2/1] test__xxsubinterpreters crashed (Exit code -6)test_already_running (test.test__xxsubinterpreters.RunStringTests.test_already_running) ...Objects/object.c:2235: _Py_ForgetReference: Assertion failed: invalid object chainEnable tracemalloc to get the memory block allocation tracebackobject address  : 0x7f01d0be95a0object refcount : 0object type     : 0xa1dc00object type name: strobject repr     : <refcnt 0 at 0x7f01d0be95a0>Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailedPython runtime state: initializedCurrent thread 0x00007f01df4a1740 (most recent call first):  <no Python frame>(...)

git clean -fdx./configure --with-pydebug --with-trace-refs CFLAGS="-O0"make -j14