fix: concurrent map write issue (bnb-chain#15)

core/blockchain.go

@@ -412,7 +412,7 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, genesis *Genesis
  // Make sure the state associated with the block is available, or log out
  // if there is no available state, waiting for state sync.
  head := bc.CurrentBlock()
- if !bc.NoTries() && !bc.HasState(head.Root) {
+ if !bc.HasState(head.Root) {
  if head.Number.Uint64() == 0 {
  // The genesis state is missing, which is only possible in the path-based
  // scheme. This situation occurs when the initial state sync is not finished

miner/worker_builder.go

@@ -284,9 +284,12 @@ func (w *worker) simulateBundles(env *environment, bundles []*types.Bundle) ([]*
  simResult := make(map[common.Hash]*types.SimulatedBundle)
 
  var wg sync.WaitGroup
+ var mu sync.Mutex
  for i, bundle := range bundles {
  if simmed, ok := simCache.GetSimulatedBundle(bundle.Hash()); ok {
+ mu.Lock()
  simResult[bundle.Hash()] = simmed
+ mu.Unlock()
  continue
  }
 
@@ -301,6 +304,8 @@ func (w *worker) simulateBundles(env *environment, bundles []*types.Bundle) ([]*
  return
  }
 
+ mu.Lock()
+ defer mu.Unlock()
  simResult[bundle.Hash()] = simmed
  }(i, bundle, env.state.Copy())
  }