3-durable.go

[unisqu]

trafficstars

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 +0x133 sync.(*WaitGroup).Done(0xc420088730) /usr/lib/go-1.10/src/sync/waitgroup.go:98 +0x34 main.startSubscriber.func1(0xc42010a780) /usr/local/src/programs/gonats/durable.go:35 +0x132 github.com/nats-io/go-nats-streaming.(*conn).processMsg(0xc4200d6380, 0xc42011e3c0) /root/go/src/github.com/nats-io/go-nats-streaming/stan.go:751 +0x262 github.com/nats-io/go-nats-streaming.(*conn).(github.com/nats-io/go-nats-streaming.processMsg)-fm(0xc42011e3c0) /root/go/src/github.com/nats-io/go-nats-streaming/sub.go:228 +0x34 github.com/nats-io/go-nats.(*Conn).waitForMsgs(0xc4200dc000, 0xc4200da480) /root/go/src/github.com/nats-io/go-nats/nats.go:1702 +0x232 created by github.com/nats-io/go-nats.(*Conn).subscribe /root/go/src/github.com/nats-io/go-nats/nats.go:2424 +0x471

[bruth]

That error means wg.Done() was called more times than wg.Add(1) which means the first subscription may not have been closed correctly prior to the new one starting.. meaning there is a race condition somewhere.