gdb freezes in malloc

Question

Suppose I have some C program like this:

#include 
#include 

int main()
{
    while (true) {
        void *p = malloc(1000)         


        

Answer 1

The reason you're froze is probably a lock that's being held by your program, and is also required by printf. When you try to aquire it twice - you fail.

A possible WA is when breaking your program to call printf, just before you make the call, type finish - it will cause the current function to complete and return to the main frame. This will ensure the lock is free before you call printf.