Mongoimport started core dumping with replica sets when we upgraded to 2.2.0.

I can reproduce it with a local three node replica set. When importing directly to PRIMARY everything works:

mongoimport -h localhost -d test -c my_collection test.json
connected to: localhost
Tue Sep 11 10:27:55 imported 1 objects

but if the set is added to the host string then mongoimport core dumps:

mongoimport -h foo/localhost -d test -c my_collection test.json
Tue Sep 11 10:21:59 starting new replica set monitor for replica set foo with seed of localhost:27017
Tue Sep 11 10:21:59 successfully connected to seed localhost:27017 for replica set foo
Tue Sep 11 10:21:59 changing hosts to

{ 0: "localhost:27017", 1: "localhost:27019", 2: "localhost:27018" }

from foo/
Tue Sep 11 10:21:59 trying to add new host localhost:27017 to replica set foo
Tue Sep 11 10:21:59 successfully connected to new host localhost:27017 in replica set foo
Tue Sep 11 10:21:59 trying to add new host localhost:27018 to replica set foo
Tue Sep 11 10:21:59 successfully connected to new host localhost:27018 in replica set foo
Tue Sep 11 10:21:59 trying to add new host localhost:27019 to replica set foo
Tue Sep 11 10:21:59 successfully connected to new host localhost:27019 in replica set foo
Tue Sep 11 10:21:59 Primary for replica set foo changed to localhost:27017
Tue Sep 11 10:21:59 replica set monitor for replica set foo started, address is foo/localhost:27017,localhost:27018,localhost:27019
Tue Sep 11 10:21:59 [ReplicaSetMonitorWatcher] starting
connected to: foo/localhost
Tue Sep 11 10:21:59 imported 1 objects
Logstream::get called in uninitialized state
Tue Sep 11 10:21:59 deleting replica set monitor for: foo/localhost:27017,localhost:27018,localhost:27019
Segmentation fault

It does not matter what kind of json document is imported, the one shown here is trivial:

cat test.json
{"menu": {"value": "File"}}

I tried the exact same setup with Mongo 2.0.7 and everything works perfectly:

mongoimport -h foo/localhost -d test -c my_collection test.json
Tue Sep 11 10:33:06 starting new replica set monitor for replica set foo with seed of localhost
Tue Sep 11 10:33:06 successfully connected to seed localhost for replica set foo
Tue Sep 11 10:33:06 changing hosts to

{ 0: "localhost:27017", 1: "localhost:27019", 2: "localhost:27018" }

from foo/
Tue Sep 11 10:33:06 trying to add new host localhost:27017 to replica set foo
Tue Sep 11 10:33:06 successfully connected to new host localhost:27017 in replica set foo
Tue Sep 11 10:33:06 trying to add new host localhost:27018 to replica set foo
Tue Sep 11 10:33:06 successfully connected to new host localhost:27018 in replica set foo
Tue Sep 11 10:33:06 trying to add new host localhost:27019 to replica set foo
Tue Sep 11 10:33:06 successfully connected to new host localhost:27019 in replica set foo
Tue Sep 11 10:33:06 replica set monitor for replica set foo started, address is foo/localhost:27017,localhost:27018,localhost:27019
Tue Sep 11 10:33:06 [ReplicaSetMonitorWatcher] starting
connected to: foo/localhost
imported 1 objects