#18984: TransactionTestCase._fixture_teardown locks under mysql
-----------------------------------+------------------------------------
Reporter: jdunck | Owner: nobody
Type: Bug | Status: new
Component: Testing framework | Version: master
Severity: Release blocker | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by aaugustin):
I'm attaching a test case that triggers the deadlock. You need an
appropriate DATABASES setting — see the comments in the patch.
Running the test with MySQL deadlocks. It dies after the third Ctrl-C with
the trace below. This is reproducible.
{{{
(django-dev)myk@mYk tests % PYTHONPATH=.. ./runtests.py
--settings=test_mysql_local test_runner.MirrorDeadlockTest
~/Documents/dev/django/tests
Creating test database for alias 'default'...
Creating test database for alias 'other'...
E^C^C^CE
======================================================================
ERROR: test_teardown_deadlock
(regressiontests.test_runner.tests.MirrorDeadlockTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/Users/myk/Documents/dev/django/tests/regressiontests/test_runner/tests.py",
line 298, in test_teardown_deadlock
Person.objects.using('default').create(first_name='Adrian',
last_name='Holovaty')
File "/Users/myk/Documents/dev/django/django/db/transaction.py", line
202, in __exit__
self.exiting(exc_value, self.using)
File "/Users/myk/Documents/dev/django/django/db/transaction.py", line
287, in exiting
leave_transaction_management(using=using)
File "/Users/myk/Documents/dev/django/django/db/transaction.py", line
51, in leave_transaction_management
connection.leave_transaction_management()
File "/Users/myk/Documents/dev/django/django/db/backends/__init__.py",
line 126, in leave_transaction_management
"Transaction managed block ended with pending COMMIT/ROLLBACK")
TransactionManagementError: Transaction managed block ended with pending
COMMIT/ROLLBACK
======================================================================
ERROR: test_teardown_deadlock
(regressiontests.test_runner.tests.MirrorDeadlockTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/Users/myk/Documents/dev/django/django/test/testcases.py", line
478, in __call__
self._post_teardown()
File "/Users/myk/Documents/dev/django/django/test/testcases.py", line
492, in _post_teardown
self._fixture_teardown()
File "/Users/myk/Documents/dev/django/django/test/testcases.py", line
510, in _fixture_teardown
skip_validation=True, reset_sequences=False)
File
"/Users/myk/Documents/dev/django/django/core/management/__init__.py", line
160, in call_command
return klass.execute(*args, **defaults)
File "/Users/myk/Documents/dev/django/django/core/management/base.py",
line 252, in execute
output = self.handle(*args, **options)
File "/Users/myk/Documents/dev/django/django/core/management/base.py",
line 382, in handle
return self.handle_noargs(**options)
File
"/Users/myk/Documents/dev/django/django/core/management/commands/flush.py",
line 64, in handle_noargs
transaction.rollback_unless_managed(using=db)
File "/Users/myk/Documents/dev/django/django/db/transaction.py", line
128, in rollback_unless_managed
connection.rollback_unless_managed()
File "/Users/myk/Documents/dev/django/django/db/backends/__init__.py",
line 222, in rollback_unless_managed
self._rollback()
File "/Users/myk/Documents/dev/django/django/db/backends/mysql/base.py",
line 420, in _rollback
BaseDatabaseWrapper._rollback(self)
File "/Users/myk/Documents/dev/django/django/db/backends/__init__.py",
line 58, in _rollback
return self.connection.rollback()
OperationalError: (2006, 'MySQL server has gone away')
----------------------------------------------------------------------
Ran 1 test in 156.871s
FAILED (errors=2)
Destroying test database for alias 'default'...
Destroying test database for alias 'other'...
}}}
Running the test with PostgreSQL also deadlocks, and refuses to die with
Ctrl-C, so I don't have a stack trace.
--
Ticket URL: <https://code.djangoproject.com/ticket/18984#comment:5>
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