#include <stdio.h> int main() { char buf[1]; printf("%d\n", buf[0]); return 1; }
/tmp/a% cat valgrind-test.c /tmp/a% gcc -Wall -g -o valgrind-test valgrind-test.c /tmp/a% ./valgrind-test -73 /tmp/a% valgrind ./valgrind-test ... ==11175== Use of uninitialised value of size 4 ==11175== at 0x4080C0B: (within /lib/libc-2.7.so) ==11175== by 0x40827D0: vfprintf (in /lib/libc-2.7.so) ==11175== by 0x408A7E2: printf (in /lib/libc-2.7.so) ==11175== by 0x804839B: main (valgrind-test.c:6)