client panic because of double close channel

[unclezoro]

System information

Geth version: v1.1.1-beta
OS & Version: Linux
Commit hash : latest

Expected behaviour

Node running normal

Actual behaviour

The client crash.

Steps to reproduce the behaviour

Backtrace

panic: close of closed channel

goroutine 76006145 [running]:
github.com/ethereum/go-ethereum/core/state.(*subfetcher).abort(0xc3126b69c0)
github.com/ethereum/go-ethereum/core/state/trie_prefetcher.go:276 +0x76
github.com/ethereum/go-ethereum/core/state.(*triePrefetcher).trie(0xc30de1be10, 0x61a85ea60b8cb23e, 0x71818f3be5c97a9f, 0xf78e1785d7342088, 0xed3325c792be57f1, 0x4f, 0xc3f06c8000)
github.com/ethereum/go-ethereum/core/state/trie_prefetcher.go:177 +0x145
github.com/ethereum/go-ethereum/core/state.(*StateObject).getTrie(0xc0eca85e00, 0x1b38780, 0xc0364d25a0, 0x99, 0x7f68bd108430)
github.com/ethereum/go-ethereum/core/state/state_object.go:168 +0x346
github.com/ethereum/go-ethereum/core/state.(*StateObject).updateTrie(0xc0eca85e00, 0x1b38780, 0xc0364d25a0, 0x0, 0x0)
github.com/ethereum/go-ethereum/core/state/state_object.go:350 +0xcd
github.com/ethereum/go-ethereum/core/state.(*StateObject).updateRoot(0xc0eca85e00, 0x1b38780, 0xc0364d25a0)
github.com/ethereum/go-ethereum/core/state/state_object.go:396 +0x5a
github.com/ethereum/go-ethereum/core/state.(*StateDB).IntermediateRoot.func3()
github.com/ethereum/go-ethereum/core/state/statedb.go:978 +0x79
github.com/ethereum/go-ethereum/core/state.(*StateDB).IntermediateRoot.func2(0xc306e023c0, 0xc306e03260)
github.com/ethereum/go-ethereum/core/state/statedb.go:962 +0x3b
created by github.com/ethereum/go-ethereum/core/state.(*StateDB).IntermediateRoot
github.com/ethereum/go-ethereum/core/state/statedb.go:958 +0x19e
INFO [08-11|13:53:28.412] Starting pprof server addr=http://0.0.0.0:6060/debug/pprof

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