BAD BLOCK error in testnet after switch to V2

[gzliudan]

Souki Aoba reported a problem about BAD BLOCK error. I also found many errors in my log messages, such as:

INFO [11-21|19:51:06] [V2 Hook Penalty] parentHeader is nil, wait block to be writen in disk parentNumber=57147741
ERROR[11-21|19:51:06] [V2 Hook Penalty] parentHeader is nil, wait too long not writen in to disk parentNumber=57147741
ERROR[11-21|19:51:06] [calcMasternodes] Adaptor v2 HookPenalty has error err="parentHeader is nil"
ERROR[11-21|19:51:06] [verifyHeader] Fail to calculate master nodes list with penalty Number=57147742 Hash=4bc5e4…85d452
WARN [11-21|19:51:06] [VerifyHeaders] Fail to verify header    fullVerify=false blockNum=57147742 blockHash=4bc5e4…85d452 error="parentHeader is nil"
ERROR[11-21|19:51:06]
########## BAD BLOCK #########
Chain config: {"chainId":51,"homesteadBlock":1,"eip150Block":2,"eip150Hash":"0x0000000000000000000000000000000000000000000000000000000000000000","eip155Block":3,"eip158Block":3,"byzantiumBlock":4,"XDPoS":{"period":2,"epoch":900,"reward":5000,"rewardCheckpoint":900,"gap":450,"foudat
ionWalletAddr":"xdc746249c61f5832c5eed53172776b460491bdcd5c","SkipV1Validation":false,"v2":{"switchBlock":56828700,"config":{"switchRound":0,"minePeriod":2,"timeoutSyncThreshold":3,"timeoutPeriod":60,"certificateThreshold":7},"allConfigs":{"0":{"switchRound":0,"minePeriod":2,"timeo
utSyncThreshold":3,"timeoutPeriod":60,"certificateThreshold":7}},"SkipV2Validation":false}}}

Number: 57147742
Hash: 0x4bc5e45081313bc972a80e22e9e7942905e02d3b351ccbf246d565fba785d452


Round: 319500
Error: <nil>
##############################

And the above error does not affect synchronization.

[gzliudan]

closed by #370