uart04 example unexpectedly reboots

[kamomil]

Hi, I updated uart04 exmple to fit raspberry pi 2, here.

It seems to work in the beginning , the code runs 2 loops of 5 iterations each on the uart rx input, and then calls enable_irq(); and then runs an infinite loop where it echos the input.
So I clicked 10 times on the keyboard and the expected to get to the infinite loop, but what actually happened is that upon the 11th click the main notmain function starts from the beginning. Why is that ?

it seems to me that there is a bug that cause it to reboot