ESP8266 code crashes, memory overwritten - stackoverflow?

Other Hardware 3rd Party Boards
2

I've just had a quick look at some of the code without following thoroughly. But I found this:

#define MAX_IN_USE 8

int buf[MAX_IN_USE * 4] = { 0 };    // int buf[32]  

/*
* Overrrides the current buffer content
*
* Parameter arr: 1d array containing the new buffer content
*/
void setWholeBuffer(int* arr) {
    for (int x = 0; x < (MAX_IN_USE * 8); x++) {  =>  64 iterations  
        Serial.print("|");
        Serial.print(buf[x]);
        Serial.print(":");
        buf[x] = arr[x];       // overflow here int buf[32] to buf[63] ??
        Serial.print(buf[x]);
    }
}

Also, you are aware that an int on an ESP8266 is 4 bytes ?