runtime: GODEBUG=memprofilerate=1 does not take effect.

[578559967]

What version of Go are you using (go version)?

$ go version
go version go1.19.1 darwin/arm64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="arm64"
GOBIN=""
GOCACHE="/Users/r/Library/Caches/go-build"
GOENV="/Users/r/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/r/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/robert/go"
GOPRIVATE=""
GOPROXY="https://goproxy.cn,direct"
GOROOT="/Users/r/workspace/testgo/go1.19.1/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/r/workspace/testgo/go1.19.1/go/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.19.1"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/j_/rq9ph2cd3h50w468sgv34lwh0000gn/T/go-build2412819877=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

// main.go
package main

import (
	"fmt"
	"runtime"
)

func main() {
	fmt.Println(runtime.MemProfileRate, runtime.MemProfile)
}

go build main.go
GODEBUG=memprofilerate=1 ./main

What did you expect to see?

Expect output，ignore the second value which may be change every time:
1 0x10029a650

What did you see instead?

524288 0x10029a650

more

I also test this on linux-amd64 and it does not work either.
I also test this with different go version. go1.17 and go1.18 and go1.19 all failed. go1.16 works as expect.

[WangLeonard]

I think it was introduced by https://go-review.googlesource.com/c/go/+/299671

[578559967]

I think it was introduced by https://go-review.googlesource.com/c/go/+/299671

Yes, you are right. After I revert this commit, it works!

[gopherbot]

Change https://go.dev/cl/431315 mentions this issue: runtime: init MemProfileRate before parse GODEBUG