m31002| 2014-08-26T18:13:45.470-0400 E REPLSETS [repl writer worker 1] writer worker caught exception:  :: caused by :: 10156 cannot update system collection: foo2.system.version q: { _id: "authSchema" } u: { _id: "authSchema", currentVersion: 3 } on: { ts: Timestamp 1409091225000|5, h: -2803074681943705287, v: 2, op: "i", ns: "foo2.system.version", o: { _id: "authSchema", currentVersion: 3 } }
 m31002| 2014-08-26T18:13:45.470-0400 I          [repl writer worker 1] Fatal Assertion 16360
 m31002| 2014-08-26T18:13:45.470-0400 I          [repl writer worker 1] 
 m31002| 
 m31002| ***aborting after fassert() failure