Example failure 1 - "OperationException:

{ note: "from execCommand", ok: 0.0, errmsg: "not master" }

" thrown in the test body"

https://mci.10gen.com/task_log_raw/mongodb_cpp_driver_windows_64_msvc2010_static_static_2d738d6a1064920151f380513363027228258caf_15_01_26_16_09_40_integration_test_latest_windows_64_msvc2010_static_static/0?type=T#L360

Example failure 2:
"OperationException:

{ code: 10107, errmsg: "Not master anymore while waiting for replication - this most likely means that a step down occurred while waiting for replication" }

" thrown in the test body.

https://mci.10gen.com/task_log_raw/mongodb_cpp_driver_windows_64_msvc2010_static_static_2d738d6a1064920151f380513363027228258caf_15_01_26_16_09_40_integration_test_latest_windows_64_msvc2010_static_static/1?type=T#L368

Example failure 3: MO 404 followed by SEH exception (?!?)

https://mci.10gen.com/task_log_raw/mongodb_cpp_driver_windows_64_msvc2010_static_static_2d738d6a1064920151f380513363027228258caf_15_01_26_16_09_40_integration_test_latest_windows_64_msvc2010_static_static/2?type=T#L426