One of the FSM-based workloads, auth_drop_user.js, crashed with the following error on the Amazon SSL build.
I've briefly talked to Andreas about this and there's a possibility that we are not using HMAC (in libycrypto) in a thread-safe manner.
mongod(mongo::printStackTrace(std::ostream&) 0x29) [0xf326b9] mongod( 0xB31FB2) [0xf31fb2] mongod( 0xB322DE) [0xf322de] libpthread.so.0( 0xF8E0) [0x7f049a0518e0] libc.so.6( 0x8C290) [0x7f0498b6b290] libcrypto.so.10( 0x141A57) [0x7f0499b59a57] libcrypto.so.10( 0x141B8D) [0x7f0499b59b8d] libcrypto.so.10(FIPS_drbg_instantiate 0x1F6) [0x7f0499b5b7c6] libcrypto.so.10(RAND_init_fips 0xD1) [0x7f0499ae7771] libcrypto.so.10(OPENSSL_init_library 0x27) [0x7f0499a7d627] libcrypto.so.10(FIPS_mode 0x9) [0x7f0499a7d579] libcrypto.so.10(HMAC_Init_ex 0x37) [0x7f0499a89777] libcrypto.so.10(HMAC 0x7F) [0x7f0499a89e5f] mongod(mongo::crypto::hmacSha1(unsigned char const*, unsigned long, unsigned char const*, unsigned long, unsigned char*, unsigned int*) 0x3F) [0x8c541f] mongod(mongo::scram::generateSaltedPassword(mongo::StringData const&, unsigned char const*, int, int, unsigned char*) 0x71) [0x8c54b1] mongod(mongo::scram::generateSecrets(std::string const&, unsigned char const*, unsigned long, unsigned long, unsigned char*, unsigned char*) 0x45) [0x8c55f5] mongod(mongo::scram::generateCredentials(std::string const&, int) 0x99) [0x8c5949] mongod(mongo::CmdCreateUser::run(mongo::OperationContext*, std::string const&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder&, bool) 0x7AD) [0x9b469d] mongod(mongo::_execCommand(mongo::OperationContext*, mongo::Command*, std::string const&, mongo::BSONObj&, int, std::string&, mongo::BSONObjBuilder&, bool) 0x34) [0x9e2314] mongod(mongo::Command::execCommand(mongo::OperationContext*, mongo::Command*, int, char const*, mongo::BSONObj&, mongo::BSONObjBuilder&, bool) 0xC13) [0x9e3253] mongod(mongo::_runCommands(mongo::OperationContext*, char const*, mongo::BSONObj&, mongo::_BufBuilder<mongo::TrivialAllocator>&, mongo::BSONObjBuilder&, bool, int) 0x28B) [0x9e3d0b] mongod(mongo::runQuery(mongo::OperationContext*, mongo::Message&, mongo::QueryMessage&, mongo::CurOp&, mongo::Message&, bool) 0x76A) [0xba0e1a] mongod(mongo::assembleResponse(mongo::OperationContext*, mongo::Message&, mongo::DbResponse&, mongo::HostAndPort const&, bool) 0xB25) [0xaba455] mongod(mongo::MyMessageHandler::process(mongo::Message&, mongo::AbstractMessagingPort*, mongo::LastError*) 0xE0) [0x8257a0] mongod(mongo::PortMessageServer::handleIncomingMsg(void*) 0x411) [0xee68a1] libpthread.so.0( 0x7C6B) [0x7f049a049c6b] libc.so.6(clone 0x6D) [0x7f0498bc15ed]
see http://buildlogs.mongodb.org/MCI_amazon/builds/516523/test/concurrency_compatibility_WT_0/fsm_all.js