Error-handling with multiple levels of decoders

A system for decoding data stored in a memory device, comprising:

• a memory device;
• and
• a processing device coupled to the memory, the processing device to perform operations comprising:
• determining by an error-handling module of a controller, that a hard read of a first codeword hard read from a first wordline has errors responsive to a first-level low density parity check (LDPC) decoder failing to correct the errors of the hard read of the first codeword;
• executing, by the controller, a hard read of a second wordline to provide a hard read of an extra parity portion for the first codeword;
• forming, by the error-handling module, a second codeword based on the hard read of the first codeword and the hard read of the extra parity portion, such that the second codeword has errors;
• inputting, by the error-handling module, the second codeword into a second-level LDPC decoder, wherein the second-level LDPC decoder attempts to decode the second codeword in response to the inputting;
• and
• storing, by the error-handling module, a corrected codeword based on the second codeword in response to determining that the second codeword has no errors.

A non-transitory computer-readable storage medium comprising instructions that, when executed by a processing device, cause the processing device to perform operations comprising:

• determining by an error-handling module of a controller, that a hard read of a first codeword hard read from a first wordline has errors responsive to a first-level low density parity check (LDPC) decoder failing to correct the errors of the first codeword;
• executing, by the controller, a hard read of a second wordline to provide a hard read of an extra parity portion for the first codeword;
• forming, by the error-handling module, a second codeword based on the hard read of the first codeword and the hard read of the extra parity portion, such that the second codeword has errors;
• inputting, by the error-handling module, the second codeword into a second-level LDPC decoder, wherein the second-level LDPC decoder attempts to decode the second codeword in response to the inputting;
• and
• storing, by the error-handling module, a corrected codeword based on the second codeword in response to determining that the second codeword has no errors.