WARNING: DATA RACE about trie operation

[mask-pp]

==================
WARNING: DATA RACE
Write at 0x00c00d842288 by goroutine 49:
github.com/ethereum/go-ethereum/trie.(*Trie).Hash()
/home/host/projects/go/src/github.com/ethereum/go-ethereum/trie/trie.go:448 +0xaa
github.com/QuarkChain/goquarkchain/core/state.(*cachingDB).OpenTrie()
/home/host/projects/go/src/github.com/ethereum/go-ethereum/trie/secure_trie.go:161 +0x159
github.com/QuarkChain/goquarkchain/core.(*MinorBlockChain).HasBlockAndState()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/core/minorblockchain.go:594 +0x16c
github.com/QuarkChain/goquarkchain/core.(*MinorBlockValidator).ValidateBlock()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/core/minorblock_validator.go:87 +0x542
github.com/QuarkChain/goquarkchain/cluster/shard.(*ShardBackend).NewMinorBlock()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/shard/api_backend.go:208 +0xd49
github.com/QuarkChain/goquarkchain/cluster/shard.(*ShardBackend).InsertMinedBlock()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/shard/api_backend.go:351 +0x57
github.com/QuarkChain/goquarkchain/cluster/miner.(*Miner).mainLoop()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/miner/miner.go:121 +0x4a2

Previous read at 0x00c00d842288 by goroutine 105:
github.com/QuarkChain/goquarkchain/core/state.(*cachingDB).CopyTrie()
/home/host/projects/go/src/github.com/ethereum/go-ethereum/trie/secure_trie.go:172 +0x149
github.com/QuarkChain/goquarkchain/core/state.(*StateDB).Copy()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/core/state/statedb.go:558 +0xaf
github.com/QuarkChain/goquarkchain/core.(*MinorBlockChain).GetRootChainStakes()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/core/minorblockchain.go:1844 +0x1d5
github.com/QuarkChain/goquarkchain/cluster/shard.(*ShardBackend).GetRootChainStakes()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/shard/api_backend.go:473 +0x1e7
github.com/QuarkChain/goquarkchain/cluster/slave.(*SlaveBackend).GetRootChainStakes()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/slave/api_backend.go:537 +0x1f4
github.com/QuarkChain/goquarkchain/cluster/slave.(*SlaveServerSideOp).GetRootChainStakes()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/slave/slave_grpc.go:512 +0x33b
github.com/QuarkChain/goquarkchain/cluster/rpc._SlaveServerSideOp_GetRootChainStakes_Handler()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/rpc/rpc.pb.go:1341 +0x2ff
google.golang.org/grpc.(*Server).processUnaryRPC()
/home/host/projects/go/src/google.golang.org/grpc/server.go:998 +0x936
google.golang.org/grpc.(*Server).handleStream()
/home/host/projects/go/src/google.golang.org/grpc/server.go:1278 +0x1351
google.golang.org/grpc.(*Server).serveStreams.func1.1()
/home/host/projects/go/src/google.golang.org/grpc/server.go:717 +0xac

Goroutine 49 (running) created at:
github.com/QuarkChain/goquarkchain/cluster/miner.New()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/miner/miner.go:58 +0x35d
github.com/QuarkChain/goquarkchain/cluster/shard.New()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/shard/shard.go:117 +0x1088
github.com/QuarkChain/goquarkchain/cluster/slave.(*SlaveBackend).CreateShards.func1()
/home/host/projects/go/src/github.com/QuarkChain/goquarkchain/cluster/slave/api_backend.go:73 +0x271
golang.org/x/sync/errgroup.(*Group).Go.func1()
/home/host/projects/go/src/golang.org/x/sync/errgroup/errgroup.go:57 +0x64

Goroutine 105 (finished) created at:
google.golang.org/grpc.(*Server).serveStreams.func1()
/home/host/projects/go/src/google.golang.org/grpc/server.go:715 +0xb8
google.golang.org/grpc/internal/transport.(*http2Server).operateHeaders()
/home/host/projects/go/src/google.golang.org/grpc/internal/transport/http2_server.go:421 +0x1622
google.golang.org/grpc/internal/transport.(*http2Server).HandleStreams()
/home/host/projects/go/src/google.golang.org/grpc/internal/transport/http2_server.go:461 +0x37a
google.golang.org/grpc.(*Server).serveStreams()
/home/host/projects/go/src/google.golang.org/grpc/server.go:713 +0x170
google.golang.org/grpc.(*Server).handleRawConn.func1()
/home/host/projects/go/src/google.golang.org/grpc/server.go:675 +0x50