QuickFIX app crashes panic: runtime error: index out of range quickfix.ParseMessageWithDataDictionary

[hunghoang]

I have a QuickFIX App that acts as a Proxy: Convert from Fix44 to Fix42 before sending message to server and convert response from Fix42 to Fix44 before sending response to client.

When I try to send 100 msg from client, My app throws:

panic: runtime error: index out of range

goroutine 44 [running]: vendor/github.com/quickfixgo/quickfix.ParseMessageWithDataDictionary(0xc0004dc0d0, 0xc00038efc0, 0x0, 0x0, 0xd, 0x10) /order-proxy/src/vendor/github.com/quickfixgo/quickfix/message.go:199 +0x20f2 vendor/github.com/quickfixgo/quickfix.inSession.resendMessages(0xc00013a400, 0x6b, 0x77, 0xc000100c60, 0xc000018880, 0x7, 0x8, 0x1439d60, 0xc000100cc0, 0xc000016998, ...) /entrade/order-proxy/src/vendor/github.com/quickfixgo/quickfix/in_session.go:220 +0x456 vendor/github.com/quickfixgo/quickfix.inSession.handleResendRequest(0xc00013a400, 0xc000194410, 0x1, 0xc0002be012)/order-proxy/src/vendor/github.com/quickfixgo/quickfix/in_session.go:186 +0x52c vendor/github.com/quickfixgo/quickfix.inSession.FixMsgIn(0xc00013a400, 0xc000194410, 0x3, 0xc0002be058) /order-proxy/src/vendor/github.com/quickfixgo/quickfix/in_session.go:33 +0x61a vendor/github.com/quickfixgo/quickfix.(*stateMachine).fixMsgIn(0xc00013a500, 0xc00013a400, 0xc000194410) /order-proxy/src/vendor/github.com/quickfixgo/quickfix/session_state.go:87 +0x69 vendor/github.com/quickfixgo/quickfix.(*stateMachine).Incoming(0xc00013a500, 0xc00013a400, 0xc000101110, 0xbf1d397766949e10, 0x8196a0d1e8, 0x16b6da0) /order-proxy/src/vendor/github.com/quickfixgo/quickfix/session_state.go:77 +0x4d5

And with race detector, I have this warning. Does not know it's related to the problem:

WARNING: DATA RACE Read at 0x00c0002be0d1 by goroutine 10: vendor/github.com/quickfixgo/quickfix.TagValue.total() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/tag_value.go:56 +0x5a vendor/github.com/quickfixgo/quickfix.FieldMap.total() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/field_map.go:273 +0x21a vendor/github.com/quickfixgo/quickfix.(*Message).cook() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/message.go:379 +0x2d2 vendor/github.com/quickfixgo/quickfix.(*Message).build() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/message.go:367 +0x50 vendor/github.com/quickfixgo/quickfix.(*Message).String() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/message.go:358 +0x14a main.(*ClientConnector).Send() /order-proxy/src/app/client_connector.go:85 +0x105 main.MessageForwarder.forwardBrokerToClient.func1() /order-proxy/src/app/message_forwarder.go:42 +0x13b

Previous write at 0x00c0002be0d0 by goroutine 72: runtime.slicecopy() /usr/local/go/src/runtime/slice.go:197 +0x0 bytes.(*Buffer).Write() /usr/local/go/src/bytes/buffer.go:177 +0x116 vendor/github.com/quickfixgo/quickfix.(*parser).ReadMessage() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/parser.go:150 +0x279 vendor/github.com/quickfixgo/quickfix.readLoop() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/connection.go:22 +0xcf

Goroutine 10 (running) created at: main.MessageForwarder.forwardBrokerToClient() /order-proxy/src/app/message_forwarder.go:36 +0x6a main.MessageForwarder.Forward() /order-proxy/src/app/message_forwarder.go:18 +0x86 main.main() /order-proxy/src/app/main.go:28 +0x1e9 Goroutine 72 (running) created at: vendor/github.com/quickfixgo/quickfix.(*Initiator).handleConnection() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/initiator.go:181 +0xa56 vendor/github.com/quickfixgo/quickfix.(*Initiator).Start.func1() /order-proxy/src/vendor/github.com/quickfixgo/quickfix/initiator.go:46