printf bug?

Hello.

I've encountered a strange behaviour of prinf function. The code is a simple "hello world" example:

#include <stdio.h>
int main()
{
	printf("Hello 1\n");
	printf("HELLO 2\n");
	return 0;
}

It works and the result are two lines in console. But once i remove the second printf, it does not show up a line. When I run debug, it seem that processor executes something and does not even reach the main function. The QSys system is Nios(50MHz)+JTAG UART(50MHz)->clock bridge(50 to 143MHz)->SDRAM controller(143MHz), and timing constraints are met.

Just found out that it works if there is no \n symbol.