Pass pointer to variable to goroutine leads to nil values

[Nicolas Morawietz]

I have the following issue in the Revel framework:
In my revel app i use revel modules. In one module is a function

func addToBlocklist(r *revel.Request, claims map[string]interface{})

which is called by

go addToBlocklist(c.Request, c.Args[jwt.TokenClaimsKey].(map[string]interface{}))

c is of type

type JwtAuth struct {
	*revel.Controller
}

reve.Controller's Request is of type *revel.Request, just as expected by addToBlocklist.
When I fmt.Println(c.Request) before passing to addToBlocklist, it prints &{0xc0003079b0 0xc0003280b0 text/html html <nil> GET 127.0.0.1:35376 0.0.0.0:9001 /logout map[] <nil> 0xc0003265b0}
When I fmt.Println(r) in the first place of addToBlocklist it prints &{<nil> 0xc0003280b0 <nil> <nil> map[] <nil> 0xc0003265b0}

This runs on docker machine with golang:1.14.6-alpine.

When I run it locally on go 1.14.6 windows the values of r in addToBlocklist are just as they were passed.

I also opened a new thread on golangbridge, because this might not be revel-dependent. Pass pointer to variable to goroutine leads to nil values

[Nicolas Morawietz]

Found out by adding defer fmt.Println(c) that the function, which is calling addToBlocklist, ends before addToBlocklist runs. And the Controller seems to be niled before addToBlocklist runs.

RefreshToken:  &{0xc00030b980 0xc000328080 text/html html   <nil> GET 127.0.0.1:35546 0.0.0.0:9001 /refresh-token map[] <nil> 0xc0002e4c30}
End RefreshToken:  &{0xc00030b980 0xc000328080 text/html html   <nil> GET 127.0.0.1:35546 0.0.0.0:9001 /refresh-token map[] <nil> 0xc0002e4c30}
addToBlockList:  &{<nil> 0xc000328080     <nil>    <nil> map[] <nil> 0xc0002e4c30}