Major - P3 Some test cases (e.g. aggregation, gle_auth) of a recent evergreen patch build failed regarding WiredTiger memory allocation failure. Please note mmapv1 configuration was detected at the beginning of those tests.
[js_test:testshard1] 2018-02-21T23:43:06.871+0000 d20510| 2018-02-21T23:43:06.871+0000 W STORAGE [initandlisten] Detected configuration for non-active storage engine mmapv1 when current storage engine is wiredTiger ... [js_test:testshard1] 2018-02-21T23:43:11.358+0000 c20513| 2018-02-21T23:43:11.357+0000 E STORAGE [initandlisten] WiredTiger error (12) [1519256591:357915][11400:0x7ffd01700a60], wiredtiger_open: memory allocation of 348842480 bytes failed: Cannot allocate memory [js_test:testshard1] 2018-02-21T23:43:11.360+0000 c20513| 2018-02-21T23:43:11.360+0000 E - [initandlisten] Assertion: Location28595: 12: Cannot allocate memory src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp 422 [js_test:testshard1] 2018-02-21T23:43:11.370+0000 c20513| 2018-02-21T23:43:11.370+0000 I STORAGE [initandlisten] exception in initAndListen: Location28595: 12: Cannot allocate memory, terminating