cmd/go: default godebug settings not recorded for test binaries #68053
Description
Go version
go version devel go1.23-e44fa1c1a9 2024-06-18 15:33:06 +0000 linux/amd64
Output of go env in your module/workspace:
GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/user/.cache/go-build'
GOENV='/home/user/.config/go/env'
GOEXE=''
GOEXPERIMENT='cacheprog'
GOFLAGS='-trimpath "-ldflags=-s -w"'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/user/.data/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/user/.data/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/home/user/sdk/gotip'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='path'
GOTOOLDIR='/home/user/sdk/gotip/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='devel go1.23-e44fa1c1a9 2024-06-18 15:33:06 +0000'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/user/.config/go/telemetry'
GCCGO='gccgo'
GOAMD64='v3'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='0'
GOMOD='/home/user/tmp/testrepo0652/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1549253000=/tmp/go-build -gno-record-gcc-switches'What did you do?
for a main_test.go (note: should be run without the main.go file below as it can affect the debug settings):
//go:debug panicnil=1
package main_test
import (
"runtime/debug"
"testing"
)
func TestFoo(t *testing.T) {
defer func() {
t.Fatal(recover())
}()
t.Log(debug.ReadBuildInfo())
panic(nil)
}running it:
=== RUN TestFoo
main_test.go:14: go devel go1.23-e44fa1c1a9 2024-06-18 15:33:06 +0000 X:cacheprog
path go.seankhliao.com/testrepo0652
mod go.seankhliao.com/testrepo0652 (devel)
build -buildmode=exe
build -compiler=gc
build -trimpath=true
build DefaultGODEBUG=asynctimerchan=1,gotypesalias=0,tls3des=1,tlskyber=0,x509keypairleaf=0,x509negativeserial=1
build CGO_ENABLED=0
build GOARCH=amd64
build GOEXPERIMENT=cacheprog
build GOOS=linux
build GOAMD64=v3
true
main_test.go:11: <nil>
--- FAIL: TestFoo (0.00s)
FAIL
FAIL go.seankhliao.com/testrepo0652 0.001s
FAIL
vs
a main.go:
//go:debug panicnil=1
package main
import (
"fmt"
"runtime/debug"
)
func main() {
defer func() {
fmt.Println(recover())
}()
fmt.Println(debug.ReadBuildInfo())
panic(nil)
}running it:
go devel go1.23-e44fa1c1a9 2024-06-18 15:33:06 +0000 X:cacheprog
path go.seankhliao.com/testrepo0652
mod go.seankhliao.com/testrepo0652 (devel)
build -buildmode=exe
build -compiler=gc
build -trimpath=true
build DefaultGODEBUG=asynctimerchan=1,gotypesalias=0,panicnil=1,tls3des=1,tlskyber=0,x509keypairleaf=0,x509negativeserial=1
build CGO_ENABLED=0
build GOARCH=amd64
build GOEXPERIMENT=cacheprog
build GOOS=linux
build GOAMD64=v3
true
<nil>
What did you see happen?
The test binary did not record a DefaultGODEBUG=panicnil=1, while the setting was clearly in effect (recover nil).
What did you expect to see?
The setting recorded as part of DefaultGODEBUG