Chain linked to block marked previously as bad

Problem

You may encounter error messages that promts block marked previously as bad. There are generally two types of these errors, one that may indicated that you are following a bad fork, similar to this:

{"level":"error","ts":"2022-08-27T09:35:00.408+0800","logger":"chain","caller":"chain/sync_manager.go:253","msg":"error during sync in [bafy2bzaceaqkpdwcfdygig4736fohmftkjk6yfthgvjopbcp6vtzpo75dtvum]: collectChain failed: chain linked to block marked previously as bad ([bafy2bzaceaqkpdwcfdygig4736fohmftkjk6yfthgvjopbcp6vtzpo75dtvum], bafy2bzacedtp46ivpr75n5z5culnx2cnhvgfvtizjxzpx6zu5uh4hrl4sveai) (reason: linked to bafy2bzacedra54fsmpkpcab426swxodzmpxdud6hcxcaxpkvswzuqkyb4wg5w caused by: [bafy2bzacebnoo5yjetazelgof3emmwdbndbj7pubzfoj45qj7jlokvubgxuj4 bafy2bzacecwxsgvjvtcyelox7jjjgkz4qcsxnvsivbmt62n24d5gotjhwue5i bafy2bzacedwudc2vmxg3lm7i4rku726k5rce2j6j5eq4oinyfti5lvhtqffmo] fork past finality)"}

The other error that also promts that a block was previously marked as bad also outputs that the parent state root did not match the computed state, similar to this:

07T09:30:30.355Z","logger":"chain","caller":"chain/sync_manager.go:254","msg":"error during sync in [bafy2bzacec6s4imaxzqfcinevrtlrvssynq6aytgahcm6zfoj2uvktm53v4ma]: collectChain failed: chain linked to block marked previously as bad ([bafy2bzacec6s4imaxzqfcinevrtlrvssynq6aytgahcm6zfoj2uvktm53v4ma], bafy2bzacebwhvvd54665mw44asdid2qlupxq7u7facqbahbtqhjl7zdl654j6) (reason: linked to bafy2bzaceacp7f7r4cmfkxmrfzfgtcqux2pgaxryld3p4ejywhqyjgliu24gq caused by: [bafy2bzacec75osxwx7hkpgjiltinf25ugzw7pzgcsae77w5a3byez5w6zx3ww] 1 error occurred:\n\t* parent state root did not match computed state

Environment

  • Mainnet
  • Calibnet
  • Butterflynet
  • Local network

Resolution

For the error message indicating that you are on a fork, there are two ways to try to resolve it.

The first solution is to:

  • unmark all bad blocks
  • reset the head to a known good epoch
  • restart the lotus node
lotus sync unmark-bad --all
lotus chain sethead --epoch <epochNumber>

The other solution is to re-import a new lightweight snapshot and restart Lotus.

For the error message indicating that parent state root did not match the computed state, this is often related to a build-error, or that the ffi-submodule was not properly updated during an upgrade. To prevent these errors you must rebuild Lotus, and during the build it is important that git submodule update is called.

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