Anentropic <e...@anentropic.com> added the comment:

Thank you for your explanation.

I am baffled why this has never happened to us before, and why a specific 
number of test cases should trigger it (comment one out or add an extra one, it 
goes away).

I've pasted our full stack trace below. It always fails in this place.

My original thought when getting this error was to check for code that executes 
at import time. The module being imported when it breaks seems totally 
innocuous though:
https://github.com/django/django/blob/2.2.19/django/db/migrations/optimizer.py

There are two instances of:

File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/ddtrace/internal/import_hooks.py",
 line 215, in wrapped_find_and_load_unlocked
    return exec_and_call_hooks(module_name, wrapped, args, kwargs)

...in the traceback, so https://github.com/DataDog/dd-trace-py starts to look 
suspicious.


Traceback (most recent call last):
  File "/work/manage.py", line 26, in <module>
    execute_from_command_line(sys.argv)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/__init__.py",
 line 381, in execute_from_command_line
    utility.execute()
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/__init__.py",
 line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/commands/test.py",
 line 23, in run_from_argv
    super().run_from_argv(argv)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/base.py",
 line 323, in run_from_argv
    self.execute(*args, **cmd_options)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/base.py",
 line 364, in execute
    output = self.handle(*args, **options)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/commands/test.py",
 line 53, in handle
    failures = test_runner.run_tests(test_labels)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django_nose/runner.py",
 line 308, in run_tests
    result = self.run_suite(nose_argv)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django_nose/runner.py",
 line 244, in run_suite
    nose.core.TestProgram(argv=nose_argv, exit=False,
  File "/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/nose/core.py", 
line 118, in __init__
    unittest.TestProgram.__init__(
  File "/root/.pyenv/versions/3.9.2/lib/python3.9/unittest/main.py", line 101, 
in __init__
    self.runTests()
  File "/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/nose/core.py", 
line 207, in runTests
    result = self.testRunner.run(self.test)
  File "/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/nose/core.py", 
line 50, in run
    wrapper = self.config.plugins.prepareTest(test)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/nose/plugins/manager.py",
 line 99, in __call__
    return self.call(*arg, **kw)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/nose/plugins/manager.py",
 line 167, in simple
    result = meth(*arg, **kw)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django_nose/plugin.py",
 line 82, in prepareTest
    self.old_names = self.runner.setup_databases()
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django_nose/runner.py",
 line 495, in setup_databases
    return super(NoseTestSuiteRunner, self).setup_databases()
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/test/runner.py",
 line 552, in setup_databases
    return _setup_databases(
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/test/utils.py", 
line 170, in setup_databases
    connection.creation.create_test_db(
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/db/backends/base/creation.py",
 line 67, in create_test_db
    call_command(
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/__init__.py",
 line 110, in call_command
    command = load_command_class(app_name, command_name)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/__init__.py",
 line 36, in load_command_class
    module = import_module('%s.management.commands.%s' % (app_name, name))
  File "/root/.pyenv/versions/3.9.2/lib/python3.9/importlib/__init__.py", line 
127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/ddtrace/internal/import_hooks.py",
 line 215, in wrapped_find_and_load_unlocked
    return exec_and_call_hooks(module_name, wrapped, args, kwargs)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/ddtrace/internal/import_hooks.py",
 line 171, in exec_and_call_hooks
    return wrapped(*args, **kwargs)
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/core/management/commands/migrate.py",
 line 14, in <module>
    from django.db.migrations.autodetector import MigrationAutodetector
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/ddtrace/internal/import_hooks.py",
 line 215, in wrapped_find_and_load_unlocked
    return exec_and_call_hooks(module_name, wrapped, args, kwargs)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/ddtrace/internal/import_hooks.py",
 line 171, in exec_and_call_hooks
    return wrapped(*args, **kwargs)
  File 
"/root/.pyenv/versions/3.9.2/lib/python3.9/site-packages/django/db/migrations/autodetector.py",
 line 10, in <module>
    from django.db.migrations.optimizer import MigrationOptimizer
  File "<frozen importlib._bootstrap>", line 1004, in _find_and_load
  File "<frozen importlib._bootstrap>", line 158, in __enter__
  File "<frozen importlib._bootstrap>", line 110, in acquire
KeyError: 140581625389696

----------

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<https://bugs.python.org/issue43546>
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