| {"problem_id": "0thbit_CRC_parallel/crc__CRC/operator_typo", "repo": "0thbit/CRC_parallel", "candidate_id": "crc__CRC", "module": "crc", "bug_type": "operator_typo", "task_type": "behavioral_bug", "target_file": "CRC.v", "problem_statement": "CRC output bit `crc_out[0]` is producing incorrect values in simulation when compared to the expected CRC calculation. The discrepancy appears for specific combinations of input data bits, particularly when `data_in[3]` and `data_in[6]` are both high. In these cases, `crc_out[0]` diverges from the reference CRC algorithm, suggesting an error in the combinational logic computing this bit. The issue is reproducible across multiple test vectors and consistently causes CRC mismatches during verification. Other CRC output bits (`crc_out[1]` and `crc_out[2]`) compute correctly, pointing to a localized problem in the `crc_out[0]` computation.", "signals_affected": ["crc_out"], "source_dir": "0thbit_CRC_parallel/source", "diff_path": "0thbit_CRC_parallel/candidates/crc__CRC/bugs/operator_typo/diff.patch", "sim_sh_path": "0thbit_CRC_parallel/candidates/crc__CRC/sim.sh", "golden_waveform_path": "0thbit_CRC_parallel/candidates/crc__CRC/golden_waveform.fst", "buggy_waveform_path": "0thbit_CRC_parallel/candidates/crc__CRC/bugs/operator_typo/buggy_waveform.fst", "waveform_context": {"time_range": [0, 102000], "signals_affected": ["crc_out"], "inputs": {"data_in": {"initial": "1111111", "changes": [{"t": 1000, "v": "0000000"}, {"t": 2000, "v": "1001011"}, {"t": 3000, "v": "1000010"}, {"t": 4000, "v": "0100011"}, {"t": 5000, "v": "1010000"}, {"t": 6000, "v": "0011101"}, {"t": 7000, "v": "1000101"}, {"t": 8000, "v": "0011101"}, {"t": 9000, "v": "1010110"}, {"t": 10000, "v": "1010111"}, {"t": 11000, "v": "1000100"}, {"t": 12000, "v": "0111111"}, {"t": 13000, "v": "0111100"}, {"t": 14000, "v": "1101100"}, {"t": 15000, "v": "0100011"}, {"t": 16000, "v": "0111000"}, {"t": 17000, "v": "1011011"}, {"t": 18000, "v": "1000011"}, {"t": 19000, "v": "1000110"}, {"t": 20000, "v": "1100000"}, {"t": 21000, "v": "1011011"}, {"t": 22000, "v": "0011111"}, {"t": 23000, "v": "0011100"}, {"t": 24000, "v": "0111110"}, {"t": 25000, "v": "1011001"}, {"t": 26000, "v": "0110101"}, {"t": 27000, "v": "1111000"}, {"t": 28000, "v": "1010101"}, {"t": 29000, "v": "1100011"}, {"t": 30000, "v": "1110010"}, {"t": 31000, "v": "0101111"}, {"t": 32000, "v": "1001111"}, {"t": 33000, "v": "0000101"}, {"t": 34000, "v": "0101110"}, {"t": 35000, "v": "1011101"}, {"t": 36000, "v": "1011010"}, {"t": 37000, "v": "1011111"}, {"t": 38000, "v": "1010000"}, {"t": 39000, "v": "0010100"}, {"t": 40000, "v": "0100100"}, {"t": 41000, "v": "1110111"}, {"t": 42000, "v": "0100111"}, {"t": 43000, "v": "1010101"}, {"t": 44000, "v": "0001000"}, {"t": 45000, "v": "1001100"}, {"t": 46000, "v": "0011100"}, {"t": 47000, "v": "1001011"}, {"t": 48000, "v": "1000110"}, {"t": 49000, "v": "0000001"}, {"t": 50000, "v": "0000011"}, {"t": 51000, "v": "1101010"}, {"t": 52000, "v": "0001111"}, {"t": 53000, "v": "1101110"}, {"t": 54000, "v": "1000000"}, {"t": 55000, "v": "1100101"}, {"t": 56000, "v": "1001111"}, {"t": 57000, "v": "0111010"}, {"t": 58000, "v": "1101101"}, {"t": 59000, "v": "0001110"}, {"t": 60000, "v": "1001101"}, {"t": 61000, "v": "0111100"}, {"t": 62000, "v": "1111010"}, {"t": 63000, "v": "0010101"}, {"t": 64000, "v": "0011111"}, {"t": 65000, "v": "0000001"}, {"t": 66000, "v": "1111001"}, {"t": 67000, "v": "1110011"}, {"t": 68000, "v": "1101100"}, {"t": 69000, "v": "0010101"}, {"t": 70000, "v": "1101101"}, {"t": 71000, "v": "1011001"}, {"t": 72000, "v": "0101010"}, {"t": 73000, "v": "0110000"}, {"t": 74000, "v": "1101000"}, {"t": 75000, "v": "1110010"}, {"t": 76000, "v": "1111000"}, {"t": 77000, "v": "1011010"}, {"t": 78000, "v": "1110011"}, {"t": 79000, "v": "0111111"}, {"t": 80000, "v": "1110101"}, {"t": 81000, "v": "1110111"}, {"t": 82000, "v": "1110010"}, {"t": 83000, "v": "1011101"}, {"t": 84000, "v": "1010111"}, {"t": 85000, "v": "0100001"}, {"t": 86000, "v": "1111101"}, {"t": 87000, "v": "1011001"}, {"t": 88000, "v": "1001001"}, {"t": 89000, "v": "0001001"}, {"t": 90000, "v": "0100000"}, {"t": 91000, "v": "0010010"}, {"t": 92000, "v": "1100111"}, {"t": 93000, "v": "1001001"}, {"t": 94000, "v": "0101101"}, {"t": 95000, "v": "0100000"}, {"t": 96000, "v": "0000100"}, {"t": 97000, "v": "1011000"}, {"t": 98000, "v": "0010110"}, {"t": 99000, "v": "1100101"}, {"t": 100000, "v": "1100100"}, {"t": 101000, "v": "1100001"}]}}, "buggy_outputs": {"crc_out": {"initial": "000", "changes": [{"t": 2000, "v": "010"}, {"t": 4000, "v": "111"}, {"t": 5000, "v": "010"}, {"t": 6000, "v": "111"}, {"t": 7000, "v": "101"}, {"t": 8000, "v": "111"}, {"t": 9000, "v": "100"}, {"t": 10000, "v": "101"}, {"t": 11000, "v": "100"}, {"t": 12000, "v": "001"}, {"t": 13000, "v": "010"}, {"t": 14000, "v": "001"}, {"t": 15000, "v": "111"}, {"t": 16000, "v": "110"}, {"t": 17000, "v": "000"}, {"t": 18000, "v": "011"}, {"t": 19000, "v": "110"}, {"t": 20000, "v": "100"}, {"t": 21000, "v": "000"}, {"t": 22000, "v": "101"}, {"t": 23000, "v": "110"}, {"t": 24000, "v": "000"}, {"t": 25000, "v": "010"}, {"t": 26000, "v": "011"}, {"t": 27000, "v": "111"}, {"t": 30000, "v": "100"}, {"t": 31000, "v": "011"}, {"t": 32000, "v": "110"}, {"t": 33000, "v": "101"}, {"t": 34000, "v": "010"}, {"t": 35000, "v": "110"}, {"t": 36000, "v": "001"}, {"t": 37000, "v": "100"}, {"t": 38000, "v": "010"}, {"t": 39000, "v": "110"}, {"t": 40000, "v": "000"}, {"t": 41000, "v": "001"}, {"t": 42000, "v": "011"}, {"t": 43000, "v": "111"}, {"t": 44000, "v": "000"}, {"t": 45000, "v": "101"}, {"t": 46000, "v": "110"}, {"t": 47000, "v": "010"}, {"t": 48000, "v": "110"}, {"t": 49000, "v": "001"}, {"t": 50000, "v": "011"}, {"t": 51000, "v": "111"}, {"t": 53000, "v": "011"}, {"t": 54000, "v": "000"}, {"t": 55000, "v": "001"}, {"t": 56000, "v": "110"}, {"t": 57000, "v": "100"}, {"t": 58000, "v": "000"}, {"t": 59000, "v": "110"}, {"t": 60000, "v": "100"}, {"t": 61000, "v": "010"}, {"t": 62000, "v": "101"}, {"t": 63000, "v": "111"}, {"t": 64000, "v": "101"}, {"t": 65000, "v": "001"}, {"t": 66000, "v": "110"}, {"t": 67000, "v": "101"}, {"t": 68000, "v": "001"}, {"t": 69000, "v": "111"}, {"t": 70000, "v": "000"}, {"t": 71000, "v": "010"}, {"t": 72000, "v": "110"}, {"t": 74000, "v": "101"}, {"t": 75000, "v": "100"}, {"t": 76000, "v": "111"}, {"t": 77000, "v": "001"}, {"t": 78000, "v": "101"}, {"t": 79000, "v": "001"}, {"t": 80000, "v": "011"}, {"t": 81000, "v": "001"}, {"t": 82000, "v": "100"}, {"t": 83000, "v": "110"}, {"t": 84000, "v": "101"}, {"t": 86000, "v": "010"}, {"t": 88000, "v": "000"}, {"t": 89000, "v": "001"}, {"t": 90000, "v": "100"}, {"t": 91000, "v": "000"}, {"t": 92000, "v": "011"}, {"t": 93000, "v": "000"}, {"t": 94000, "v": "001"}, {"t": 95000, "v": "100"}, {"t": 97000, "v": "011"}, {"t": 98000, "v": "100"}, {"t": 99000, "v": "001"}, {"t": 100000, "v": "000"}, {"t": 101000, "v": "101"}]}}, "golden_outputs": {"crc_out": {"initial": "001", "changes": [{"t": 1000, "v": "000"}, {"t": 2000, "v": "011"}, {"t": 4000, "v": "111"}, {"t": 5000, "v": "011"}, {"t": 6000, "v": "110"}, {"t": 7000, "v": "100"}, {"t": 8000, "v": "110"}, {"t": 9000, "v": "101"}, {"t": 10000, "v": "100"}, {"t": 11000, "v": "101"}, {"t": 12000, "v": "000"}, {"t": 13000, "v": "011"}, {"t": 14000, "v": "000"}, {"t": 15000, "v": "111"}, {"t": 17000, "v": "001"}, {"t": 18000, "v": "010"}, {"t": 19000, "v": "111"}, {"t": 20000, "v": "101"}, {"t": 21000, "v": "001"}, {"t": 22000, "v": "100"}, {"t": 23000, "v": "111"}, {"t": 24000, "v": "001"}, {"t": 25000, "v": "011"}, {"t": 27000, "v": "110"}, {"t": 30000, "v": "101"}, {"t": 31000, "v": "010"}, {"t": 32000, "v": "111"}, {"t": 33000, "v": "101"}, {"t": 34000, "v": "011"}, {"t": 35000, "v": "111"}, {"t": 36000, "v": "000"}, {"t": 37000, "v": "101"}, {"t": 38000, "v": "011"}, {"t": 39000, "v": "110"}, {"t": 40000, "v": "000"}, {"t": 42000, "v": "011"}, {"t": 43000, "v": "110"}, {"t": 44000, "v": "001"}, {"t": 45000, "v": "100"}, {"t": 46000, "v": "111"}, {"t": 47000, "v": "011"}, {"t": 48000, "v": "111"}, {"t": 49000, "v": "001"}, {"t": 50000, "v": "011"}, {"t": 51000, "v": "110"}, {"t": 53000, "v": "010"}, {"t": 54000, "v": "001"}, {"t": 55000, "v": "000"}, {"t": 56000, "v": "111"}, {"t": 57000, "v": "101"}, {"t": 58000, "v": "001"}, {"t": 59000, "v": "111"}, {"t": 60000, "v": "101"}, {"t": 61000, "v": "011"}, {"t": 62000, "v": "100"}, {"t": 63000, "v": "111"}, {"t": 64000, "v": "100"}, {"t": 65000, "v": "001"}, {"t": 66000, "v": "111"}, {"t": 67000, "v": "100"}, {"t": 68000, "v": "000"}, {"t": 69000, "v": "111"}, {"t": 70000, "v": "001"}, {"t": 71000, "v": "011"}, {"t": 72000, "v": "111"}, {"t": 73000, "v": "110"}, {"t": 74000, "v": "100"}, {"t": 75000, "v": "101"}, {"t": 76000, "v": "110"}, {"t": 77000, "v": "000"}, {"t": 78000, "v": "100"}, {"t": 79000, "v": "000"}, {"t": 80000, "v": "010"}, {"t": 81000, "v": "000"}, {"t": 82000, "v": "101"}, {"t": 83000, "v": "111"}, {"t": 84000, "v": "100"}, {"t": 85000, "v": "101"}, {"t": 86000, "v": "011"}, {"t": 88000, "v": "001"}, {"t": 89000, "v": "000"}, {"t": 90000, "v": "100"}, {"t": 91000, "v": "000"}, {"t": 92000, "v": "010"}, {"t": 93000, "v": "001"}, {"t": 94000, "v": "000"}, {"t": 95000, "v": "100"}, {"t": 97000, "v": "010"}, {"t": 98000, "v": "100"}, {"t": 99000, "v": "000"}, {"t": 100000, "v": "001"}, {"t": 101000, "v": "100"}]}}}} | |