panic: runtime error: invalid memory address or nil pointer dereference: cmd/go/internal/fips140/fips140.go:117

[sergey-kurenkov-at-github]

Go version

go version go1.25.0 linux/amd64

Output of go env in your module/workspace:

$ go env
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE=''
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/mycompany/data/user/.cache'
GOCACHEPROG=''
GODEBUG=''
GOENV='/home/user/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build698337929=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/tmp/hello/go.mod'
GOMODCACHE='/mycompany/data/user/go/pkg/mod'
GONOPROXY='git.mycompany.io'
GONOSUMDB='git.mycompany.io'
GOOS='linux'
GOPATH='/mycompany/data/user/go'
GOPRIVATE='git.mycompany.io'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/mycompany/data/user/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.25.0.linux-amd64'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/home/user/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/mycompany/data/user/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.25.0.linux-amd64/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.25.0'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

$ cat hello.go
package main
import "fmt"
func main() {
    fmt.Println("hello world")
}

research-26 /tmp/hello 
$ cat go.mod  
module hello

go 1.25.0
research-26 /tmp/hello 
$ GOEXPERIMENT=greenteagc go run ./hello.go
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x3 pc=0x819be1]

goroutine 1 [running]:
cmd/go/internal/fips140.Init()
	cmd/go/internal/fips140/fips140.go:117 +0x101
cmd/go/internal/modload.Init()
	cmd/go/internal/modload/init.go:419 +0x33
cmd/go/internal/toolchain.Exec({0xc0000b49c0, 0x8})
	cmd/go/internal/toolchain/select.go:356 +0x3fc
cmd/go/internal/toolchain.Select()
	cmd/go/internal/toolchain/select.go:284 +0x11a5
main.main()
	cmd/go/main.go:107 +0x4f
research-26 /tmp/hello 

What did you see happen?

$ GOEXPERIMENT=greenteagc go run ./hello.go
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x3 pc=0x819be1]

goroutine 1 [running]:
cmd/go/internal/fips140.Init()
	cmd/go/internal/fips140/fips140.go:117 +0x101
cmd/go/internal/modload.Init()
	cmd/go/internal/modload/init.go:419 +0x33
cmd/go/internal/toolchain.Exec({0xc0000b49c0, 0x8})
	cmd/go/internal/toolchain/select.go:356 +0x3fc
cmd/go/internal/toolchain.Select()
	cmd/go/internal/toolchain/select.go:284 +0x11a5
main.main()
	cmd/go/main.go:107 +0x4f

What did you expect to see?

$ go run ./hello.go 
hello world