Memory issues in main loop?

[mlsorensen]

I'm battling what I'm guessing is a memory issue. In my main loop(), I'm creating a parser then parsing a message. If I create the parser as a 64, I can only send 4 messages successfully and get the proper response before the AVR starts rebooting repeatedly and becomes unresponsive even after reset, requiring power off. If I create the parser as a 16, I can send and respond to more messages, 16. It's as if I need a free() for the parser. I'm relatively new to AVR programming, so perhaps it's something I'm doing.

message being parsed: {"color":[200,0,0],"lednum":4,"msgtype":"ledcolor"}

void loop() {
    String msg;

    // fetch json message
    if(Serial.available()) {
        while(1) {
            if(Serial.available()) {
                char chr = Serial.read();
                if (chr == '\r') {
                    break;
                }
                msg += chr;
            }
        }
    }

    // act on message
    if (msg.length() > 0) {
        char * cstr = new char [msg.length() + 1];
        strcpy(cstr, msg.c_str());

        JsonParser<16> parser;
        ArduinoJson::Parser::JsonObject incoming = parser.parse(cstr);
        if (strcmp(incoming["msgtype"],"ledcolor") == 0) {
            ack(1, "got test");
        }
    }
}

void ack(bool success, char * msg) {
    ArduinoJson::Generator::JsonObject<3> outgoing;
    outgoing["msgtype"] = "ack";
    outgoing["result"] = success;
    outgoing["detail"] = msg;

    Serial.println(outgoing);
}

[mlsorensen]

Never mind, I seem to have cleared it up by calling free() on "cstr".