When you say it hangs, do you mean that every single goroutine hangs or just some of them? If it is just some of them, I don't have any ideas, but you could try running with -race to catch deadlocks. If it is all of them then you might be running into a problem that I had where the GC suspends all goroutines waiting for an unpreemptable goroutine to finish.
Try adding a goroutine that just prints "hello" and sleeps for a second in a loop. If that goroutine stops printing hello then it is very likely to be the problem I described. On Friday, May 4, 2018 at 7:24:56 AM UTC-7, s...@whites.team wrote: > > Hi all, > > I'm having an issue with a messaging server I'm trying to write in Go (my > first real Go project). I'm having an issue that I've not come across > before in Go - the code executes as expected, then hangs after a second or > so indefinitely, no errors, no logs showing it's exited. The code is > available here > <https://gitlab.com/samisagit/go-im-server/blob/changed-redis-handler-buggy/src/main.go#L110>. > > The functions of note are RedisWriteHandler and addRedisSender. In func > main I'm seeding a channel with the max amount of items (currently 100k) > then starting RedisWriteHandler, this should auto scale up and down > according to the length of the channel. However before it gets a chance to > scale down it hangs. I've checked with redis-cli and the senders are still > connected, but no more messages are coming though. Unfortunately I can't > replicate this in the go playground as it's never going to return, and it > will take too long and get kicked. I also asked this question here > <https://stackoverflow.com/questions/50129226/golang-channels-getting-stuck> > but it seems to have gone quiet. > > Based on comments from a couple other questions in this group I've killed > the process manually to get the stack trace which I'll attach, hopefully > this is helpful. > > Any thoughts would be greatly appreciated! > > Thanks, > > Sam > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
