Arduino freeze when declare String variable

Simple program with String variable will make Arduino freeze, source code like below

void loop()
{
String myStr = "";
}

 

How do you know it`s freezing with your code , it`s not doing anything .

 

My code like below, Due freeze when i comment variable String recv = "", when I change it to Charactor array like char recv[200];, code will work fine,

String recv = "";

void setup(){
Serial.begin(9600);
}

void loop(){
while (Serial.available())
{
char ch = Serial.read();
recv += ch;
if (ch = '\n') {
Serial.println(recv);
}
}

 

Hi, I've got a similar issue with the Due freezing when certain code is included. Did you manage to get to the bottom of what was going on with your issue ?