Major - P3 While running patch with causal consistency set to true by default got the failure:
[js_test:server6118] 2017-07-05T16:52:55.756+0000 s20015| 2017-07-05T16:52:55.757+0000 I ASIO [NetworkInterfaceASIO-ShardRegistry-0] Successfully connected to WIN-4VBEH91NV9K:20011, took 1996ms (1 connections now open to WIN-4VBEH91NV9K:20011) [js_test:server6118] 2017-07-05T16:52:55.759+0000 s20015| 2017-07-05T16:52:55.759+0000 I SHARDING [conn1] Placing [test] on: shard0000 [js_test:server6118] 2017-07-05T16:52:55.759+0000 s20015| 2017-07-05T16:52:55.759+0000 I SHARDING [conn1] Enabling sharding for database [test] in config db [js_test:server6118] 2017-07-05T16:52:55.890+0000 s20015| 2017-07-05T16:52:55.889+0000 I SHARDING [conn1] distributed lock with ts: 595d1963386e8efd0d4cdf5a' unlocked. [js_test:server6118] 2017-07-05T16:52:55.891+0000 s20015| 2017-07-05T16:52:55.890+0000 F NETWORK [NetworkInterfaceASIO-ShardRegistry-0] OP_MSG with duplicate field '$logicalTime' : { _configsvrMovePrimary: "test", to: "shard0001", $logicalTime: { clusterTime: Timestamp 1499273575000|3, signature: { hash: BinData(0, 3D46F81E6099541693C9ADDD77E1875F8B54522B), keyId: 6439330895072591873 } }, $replData: 1, $logicalTime: { clusterTime: Timestamp 1499273575000|3, signature: { hash: BinData(0, 3D46F81E6099541693C9ADDD77E1875F8B54522B), keyId: 6439330895072591873 } }, $client: { application: { name: "MongoDB Shell" }, driver: { name: "MongoDB Internal Client", version: "3.5.9-175-ga3f9f13-patch-595d10b92fbabe066c0006f0" }, os: { type: "Windows", name: "Microsoft Windows Server 2008 R2", architecture: "x86_64", version: "6.1 SP1 (build 7601)" } }, $configServerState: { opTime: { ts: Timestamp 1499273575000|3, t: 1 } }, $db: "admin" } [js_test:server6118] 2017-07-05T16:52:55.891+0000 s20015| 2017-07-05T16:52:55.890+0000 F - [NetworkInterfaceASIO-ShardRegistry-0] Fatal Assertion 40474 at src\mongo\util\net\op_msg.cpp 199 [js_test:server6118] 2017-07-05T16:52:55.891+0000 s20015| 2017-07-05T16:52:55.890+0000 F - [NetworkInterfaceASIO-ShardRegistry-0] [js_test:server6118] 2017-07-05T16:52:55.891+0000 s20015| [js_test:server6118] 2017-07-05T16:52:55.891+0000 s20015| ***aborting after fassert() failure [js_test:server6118] 2017-07-05T16:52:55.891+0000 s20015|