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Detected memory leak

Leak report attached below.

leaks Report Version: 4.0, multi-line stacks
Process 46563: 233 nodes malloced for 1620 KB
Process 46563: 6 leaks for 1638592 total leaked bytes.

STACK OF 2 INSTANCES OF 'ROOT LEAK: <calloc in NewSet>':
5   dyld                                  0x18fc0ff28 start + 2236
4   example-benchmark.out                 0x1003ef7fc main + 820
3   example-benchmark.out                 0x1003ee474 ministat + 344
2   example-benchmark.out                 0x1003ee68c ReadSet + 28
1   example-benchmark.out                 0x1003ef85c NewSet + 24
0   libsystem_malloc.dylib                0x18fda8eb0 _malloc_zone_calloc_instrumented_or_legacy + 92
====
    6 (1.56M) << TOTAL >>

      3 (800K) ROOT LEAK: <calloc in NewSet 0x140f040f0> [64]
         1 (800K) <calloc in NewSet 0x148008000> [819200]
         1 (32 bytes) <malloc in ReadSet 0x140f04130> [32]

      3 (800K) ROOT LEAK: <calloc in NewSet 0x140f04150> [64]
         1 (800K) <calloc in NewSet 0x1480d0000> [819200]
         1 (32 bytes) <malloc in ReadSet 0x140f04190> [32]

Segmentation fault detected

Thank you for your great work.
I am testing your minibench on my project rb_bench and encountered some problems.

When I test your minibench on apple ARM M1 machine, the is no segmentation fault.
However, when I use linux the segmentation fault is appeared in the following line.

I cannot debug on my own since your variable i, j, m, x contains no clue of what they stand for.

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