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Sometimes, why the current block height is 1 when the 'geth' reboot ( height is 100 before), so it tooltips ErrKnownBlock = errors.New("block already known") If the geth reboot, why the block height is 1 or less than 100 (which before reboot)?

// ValidateBody validates the given block's uncles and verifies the block
// header's transaction and uncle roots. The headers are assumed to be already
// validated at this point.
func (v *BlockValidator) ValidateBody(block *types.Block) error {
    // Check whether the block's known, and if not, that it's linkable
    if v.bc.HasBlockAndState(block.Hash(), block.NumberU64()) {
        return ErrKnownBlock
    }
.....

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