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Running PyMongo's test suite, on the branch where I'm implementing sessions, I crashed a standalone mongod running with auth. 2017-09-17T10:44:54.724-0400 F - [conn384] Invariant failure ccPin == ErrorCodes::QueryPlanKilled src/mongo/db/query/find.cpp 330 mongod(_ZN5mongo15invariantFailedEPKcS1_j+0x2E6) [0x10f4c1666] mongod(_ZN5mongo7getMoreEPNS_16OperationContextEPKcixPbS4_+0x18E2) [0x10e49fd52] mongod(_ZN5mongo23ServiceEntryPointMongod13handleRequestEPNS_16OperationContextERKNS_7MessageE+0x1528) [0x10e179378] mongod(_ZN5mongo19ServiceStateMachine15_processMessageERNS0_11ThreadGuardE+0x18A) [0x10e186a8a] mongod(_ZN5mongo19ServiceStateMachine15_runNextInGuardERNS0_11ThreadGuardE+0x175) [0x10e185f45] mongod(_ZN5mongo19ServiceStateMachine7runNextEv+0x38) [0x10e1868b8] mongod(_ZNSt3__110__function6__funcIZN5mongo21ServiceEntryPointImpl12startSessionENS_10shared_ptrINS2_9transport7SessionEEEE3$_1NS_9allocatorIS8 Log attached. I think that PyMongo was executing some part of this test: def test_aggregate_raw(self): c = self.db.test c.drop() docs = [{'_id': i, 'x': 3.0 * i} for i in range(10)] c.insert_many(docs) batches = list(c.aggregate_raw_batches([{'$sort': {'_id': 1}}])) self.assertEqual(1, len(batches)) self.assertEqual(docs, decode_all(batches[0])) PyMongo's aggregate_raw_batches method sets the initial batch size to 0 with the "aggregate" command, then issues a "getMore".

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xgen-internal-githook commented on Wed, 20 Sep 2017 16:27:57 +0000: Author: {'email': 'jcarey@argv.me', 'name': 'Jason Carey', 'username': 'hanumantmk'} Message: SERVER-31117 pin can return unauthorized Being too specific about pinCursor error code returns causes an unauthorized legacy getMore to invariant. Branch: master https://github.com/mongodb/mongo/commit/dc84bdb8db1446d21fde5e59cf7b0df1149871ac jesse commented on Tue, 19 Sep 2017 15:06:34 +0000: Based on mira.carey@mongodb.com's diagnosis in SERVER-31120, my PyMongo code was probably sending a different lsid with getMore than with aggregate. jesse commented on Sun, 17 Sep 2017 16:15:01 +0000: Reproduced here too with a patch build of PyMongo: https://evergreen.mongodb.com/task/mongo_python_driver_tests_windows_vs2015_python_version__auth_ssl~auth_ssl_windows_vs2015_python_version~3.6_test_latest_standalone_patch_200b699ba553979afa543e33eefc44276a532477_59be8ccf2fbabe322000001f_17_09_17_14_55_12

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