Invariant failure _name == nsToDatabaseSubstring(ns)

* thread #17: tid = 0xe8569, 0x00007fff9a36370e libsystem_kernel.dylib`__write_nocancel + 10
  * frame #0: 0x00007fff9a36370e libsystem_kernel.dylib`__write_nocancel + 10
    frame #1: 0x00007fff936f3202 libsystem_c.dylib`_swrite + 87
    frame #2: 0x00007fff936eb72c libsystem_c.dylib`__sflush + 87
    frame #3: 0x00007fff936ee040 libsystem_c.dylib`__sfvwrite + 823
    frame #4: 0x00007fff936ee34a libsystem_c.dylib`fwrite + 153
    frame #5: 0x00007fff8730438c libc++.1.dylib`std::__1::__stdoutbuf<char>::overflow(int) + 84
    frame #6: 0x00007fff872fa1cd libc++.1.dylib`std::__1::basic_streambuf<char, std::__1::char_traits<char> >::xsputn(char const*, long) + 73
    frame #7: 0x00007fff873011cd libc++.1.dylib`std::__1::basic_ostream<char, std::__1::char_traits<char> >::write(char const*, long) + 73
    frame #8: 0x0000000100051545 mongod`mongo::operator<<(std::__1::basic_ostream<char, std::__1::char_traits<char> >&, mongo::StringData)(stream=0x00007fff76a102f8, value=(_data = "\n\n***aborting after invariant() failure\n\n\n", _size = 42)) + 69 at string_data.cpp:57
    frame #9: 0x000000010112b53b mongod`mongo::logger::MessageEventDetailsEncoder::encode(this=0x0000000105017f30, event=0x0000700000825918, os=0x00007fff76a102f8) + 731 at message_event_utf8_encoder.cpp:77
    frame #10: 0x0000000100761be0 mongod`mongo::logger::ConsoleAppender<mongo::logger::MessageEventEphemeral, mongo::Console>::append(this=0x0000000105013320, event=0x0000700000825918) + 192 at console_appender.h:53
    frame #11: 0x000000010112c0ae mongod`mongo::logger::LogDomain<mongo::logger::MessageEventEphemeral>::append(this=0x00000001050132d8, event=0x0000700000825918) + 574 at log_domain-impl.h:59
    frame #12: 0x0000000101128299 mongod`mongo::logger::LogstreamBuilder::~LogstreamBuilder(this=0x0000700000825e48) + 1401 at logstream_builder.cpp:129
    frame #13: 0x0000000101128c45 mongod`mongo::logger::LogstreamBuilder::~LogstreamBuilder(this=0x0000700000825e48) + 21 at logstream_builder.cpp:121
    frame #14: 0x00000001014b800e mongod`mongo::invariantFailed(expr="_name == nsToDatabaseSubstring(ns)", file="src/mongo/db/catalog/database.cpp", line=429) + 382 at assert_util.cpp:152
    frame #15: 0x000000010031ac5d mongod`mongo::Database::getCollection(this=0x0000000105011be0, ns=(_data = "u", _size = 1)) const + 141 at database.cpp:429
    frame #16: 0x0000000100752363 mongod`mongo::IndexBuilder::_build(this=0x0000700000827158, txn=0x0000000105012f20, db=0x0000000105011be0, allowBackgroundBuilding=false, dbLock=0x0000000000000000) const + 323 at index_builder.cpp:128
    frame #17: 0x0000000100753372 mongod`mongo::IndexBuilder::buildInForeground(this=0x0000700000827158, txn=0x0000000105012f20, db=0x0000000105011be0) const + 50 at index_builder.cpp:110
    frame #18: 0x0000000100bfca0c mongod`mongo::repl::applyOperation_inlock(txn=0x0000000105012f20, db=0x0000000105011be0, op=0x000070000082a418, convertUpdateToUpsert=true, incrementOpsAppliedStats=mongo::repl::IncrementOpsAppliedStatsFn @ 0x000070000082a900)>) + 3164 at oplog.cpp:754
    frame #19: 0x00000001002d713a mongod`mongo::applyOps(txn=0x0000000105012f20, dbName="admin", applyOpCmd=0x000070000082aeb0, result=0x000070000082b040) + 4394 at apply_ops.cpp:141
    frame #20: 0x0000000100371c72 mongod`mongo::ApplyOpsCmd::run(this=0x00000001029a6e00, txn=0x0000000105012f20, dbname="admin", cmdObj=0x000070000082aeb0, (null)=0, errmsg="", result=0x000070000082b040) + 658 at apply_ops.cpp:112
    frame #21: 0x00000001004ceeca mongod`mongo::Command::run(this=0x00000001029a6e00, txn=0x0000000105012f20, request=0x000070000082bed0, replyBuilder=0x000070000082c080) + 3690 at dbcommands.cpp:1441
    frame #22: 0x00000001004cdb30 mongod`mongo::Command::execCommand(txn=0x0000000105012f20, command=0x00000001029a6e00, request=0x000070000082bed0, replyBuilder=0x000070000082c080) + 5264 at dbcommands.cpp:1326
    frame #23: 0x000000010036f6a6 mongod`mongo::runCommands(txn=0x0000000105012f20, request=0x000070000082bed0, replyBuilder=0x000070000082c080) + 2118 at commands.cpp:498
    frame #24: 0x0000000100765f34 mongod`mongo::(anonymous namespace)::receivedRpc(txn=0x0000000105012f20, client=0x0000000105130f20, dbResponse=0x000070000082d430, message=0x000070000082db90) + 628 at instance.cpp:304
    frame #25: 0x0000000100762edd mongod`mongo::assembleResponse(txn=0x0000000105012f20, m=0x000070000082db90, dbresponse=0x000070000082d430, remote=0x000070000082d1b0) + 2301 at instance.cpp:525
    frame #26: 0x000000010000c24d mongod`mongo::MyMessageHandler::process(this=0x0000000105011180, m=0x000070000082db90, port=0x0000000105012500) + 397 at db.cpp:171