I think this is a bug, I change the logic of main goroutine and the other
goroutine, then the deadlock disappeared
```go
package main
import (
"fmt"
"time"
)
var (
source = make(chan int)
idle = make(chan int, 1)
)
func main() {
go func() {
for {
select {
case worker := <-source:
idle <- worker
case worker := <-idle:
fmt.Println(worker)
go func() {
time.Sleep(time.Second)
idle <- 1
}()
}
}
}()
for i := 0; i < 2; i++ {
source <- i
}
time.Sleep(time.Second * 10)
}
```
在 2018年2月7日星期三 UTC+8下午10:38:41，Damon Zhao写道：
>
> Please answer these questions before submitting your issue. Thanks!
> What version of Go are you using (go version)?
>
> go version go1.9.3 darwin/amd64
> Does this issue reproduce with the latest release?
>
> yes
> What operating system and processor architecture are you using (go env)?
> GOARCH="amd64"
> GOBIN=""
> GOEXE=""
> GOHOSTARCH="amd64"
> GOHOSTOS="darwin"
> GOOS="darwin"
> GOPATH="/Users/ariesdevil/Dropbox/workspace/go_workspace"
> GORACE=""
> GOROOT="/usr/local/Cellar/go/1.9.3/libexec"
> GOTOOLDIR="/usr/local/Cellar/go/1.9.3/libexec/pkg/tool/darwin_amd64"
> GCCGO="gccgo"
> CC="clang"
> GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments
> -fmessage-length=0
> -fdebug-prefix-map=/var/folders/h2/xl15t9g94tgfwclshzl086bh0000gp/T/go-build125147941=/tmp/go-build
>
> -gno-record-gcc-switches -fno-common"
> CXX="clang++"
> CGO_ENABLED="1"
> CGO_CFLAGS="-g -O2"
> CGO_CPPFLAGS=""
> CGO_CXXFLAGS="-g -O2"
> CGO_FFLAGS="-g -O2"
> CGO_LDFLAGS="-g -O2"
> PKG_CONFIG="pkg-config"
>
> What did you do?
>
> code1: play.golang.org/p/8rcO11QS8un (@ianlancetaylor answerd at
> https://github.com/golang/go/issues/23728#issuecomment-363771924)
>
>
> code2: https://play.golang.org/p/fJXhK8w22uu
>
> Above code2 sometimes run perfect and sometimes deadlock on my machine.
>
>
> <https://lh3.googleusercontent.com/-j-2Sg_4wENk/WnsPXZktt7I/AAAAAAAAb9M/vI8Ci9g8k9gZ_83XWS6qgR2bxjuHN8w1ACLcBGAs/s1600/%25E5%25B1%258F%25E5%25B9%2595%25E5%25BF%25AB%25E7%2585%25A7%2B2018-02-07%2B22.10.22.png>
>
>
>
> But if I put it in a goroutine, the result is confused:
>
>
> https://play.golang.org/p/oUmMr8TM2sz success
>
> https://play.golang.org/p/54eLI7x5FwD failed
>
>
> notice line 25 when I use
>
> ```
>
> case worker := <-source:
>
> idle <- worker
>
> ```
>
> instead of:
>
> ```
>
> case idle <- <-source:
>
> ```
>
> it works.
> What did you expect to see?
>
> I think it should not deadlock.
> What did you see instead?
> deadlock sometimes.
>
>
>
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