Code AnalysisHard 60s

Uninitialized read causing sanitizer failure

What bug would AddressSanitizer/MemorySanitizer most likely report?

Starter code

#include <cstring>

int f() {
    char buf[16];
    buf[0] = 1;
    int sum = 0;
    for (int i = 0; i < 16; ++i) sum += buf[i];
    return sum;
}

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