It's a bug in sqlalchemy. The test suite of sqlalchemy is crashing, too.

$ PYTHONFAULTHANDLER=1 ../bin/pytest -v -s
=================================================================== test session starts ====================================================================
platform linux -- Python 3.6.0b1+, pytest-3.0.2, py-1.4.31, pluggy-0.3.1 -- /home/heimes/dev/python/python3.6/blaze/bin/python3.6
cachedir: .cache
rootdir: /home/heimes/dev/python/python3.6/blaze/sqlalchemy, inifile: setup.cfg
collected 7883 items 

test/aaa_profiling/test_compiler.py::CompileTest_sqlite_pysqlite::test_insert SKIPPED
test/aaa_profiling/test_compiler.py::CompileTest_sqlite_pysqlite::test_select SKIPPED
test/aaa_profiling/test_compiler.py::CompileTest_sqlite_pysqlite::test_select_labels python3.6: Objects/dictobject.c:1743: _PyDict_Pop: Assertion `ix >= 0' failed.
Fatal Python error: Aborted

Current thread 0x00007f5606ac8700 (most recent call first):
  File "/home/heimes/dev/python/python3.6/blaze/sqlalchemy/test/../lib/sqlalchemy/util/langhelpers.py", line 796 in expire_instance
  File "/home/heimes/dev/python/python3.6/blaze/sqlalchemy/test/../lib/sqlalchemy/sql/selectable.py", line 666 in _reset_exported
  File "/home/heimes/dev/python/python3.6/blaze/sqlalchemy/test/../lib/sqlalchemy/sql/selectable.py", line 1918 in _generate
  File "/home/heimes/dev/python/python3.6/blaze/sqlalchemy/test/../lib/sqlalchemy/sql/base.py", line 44 in _generative
  File "<string>", line 2 in apply_labels
  File "/home/heimes/dev/python/python3.6/blaze/sqlalchemy/test/aaa_profiling/test_compiler.py", line 72 in test_select_labels
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/python.py", line 149 in pytest_pyfunc_call
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 596 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 264 in __init__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 247 in _wrapped_call
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 595 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 333 in <lambda>
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 338 in _hookexec
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 724 in __call__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/python.py", line 1552 in runtest
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 104 in pytest_runtest_call
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 596 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 264 in __init__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 247 in _wrapped_call
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 595 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 333 in <lambda>
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 338 in _hookexec
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 724 in __call__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 151 in <lambda>
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 163 in __init__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 151 in call_runtest_hook
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 133 in call_and_report
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 79 in runtestprotocol
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/runner.py", line 66 in pytest_runtest_protocol
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 596 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 264 in __init__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 247 in _wrapped_call
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 595 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 333 in <lambda>
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 338 in _hookexec
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 724 in __call__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/main.py", line 152 in pytest_runtestloop
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 596 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 333 in <lambda>
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 338 in _hookexec
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 724 in __call__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/main.py", line 131 in _main
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/main.py", line 96 in wrap_session
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/main.py", line 125 in pytest_cmdline_main
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 596 in execute
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 333 in <lambda>
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 338 in _hookexec
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/vendored_packages/pluggy.py", line 724 in __call__
  File "/home/heimes/dev/python/python3.6/blaze/lib/python3.6/site-packages/_pytest/config.py", line 57 in main
  File "../bin/pytest", line 11 in <module>
Aborted (core dumped)