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This code is essentially from an LTP test ( http://ltp.sourceforge.net/ <http://ltp.sourceforge.net/> ). #include <stdlib.h> int main() { void *curr; do { curr = malloc(1); } while (curr); return 0; } If you compile it with no optimization, it will keep the malloc calls. If you compile it with -O2, it will create an infinite loop, i.e. assuming that malloc

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