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3-durable.go

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i renamed durable.go and i got the error below sometimes. I ran it within docker container. what's the problem? panic: sync: negative WaitGroup counter goroutine 30 [running]: sync.(*WaitGroup).Add(0xc420088730, 0xffffffffffffffff) /usr/lib/go-1.10/src/sync/waitgroup.go:73...

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