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

go version devel +755fd93 Wed Jun 7 22:29:13 2017 +0000 linux/arm64

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

GOARCH="arm64"
GOBIN=""
GOEXE=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/weixia01/go"
GORACE=""
GOROOT="/home/weixia01/workspace/llt/golang/golang"
GOTOOLDIR="/home/weixia01/workspace/llt/golang/golang/pkg/tool/linux_arm64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build419143943=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
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?

$ cd src/cmd/go
$ go test -run TestBuildIDContainsArchModeEnv

What did you expect to see?

PASS

What did you see instead?

--- FAIL: TestBuildIDContainsArchModeEnv (3.57s)
--- FAIL: TestBuildIDContainsArchModeEnv/386 (1.64s)
go_test.go:310: running testgo [install mycmd]
go_test.go:310: running testgo [list -f {{.Stale}}:{{.StaleReason}} mycmd]
go_test.go:319: standard output:
go_test.go:320: false:

    go_test.go:618: should be stale after environment variable change

FAIL
exit status 1
FAIL cmd/go 6.534s