cmd/compile: internal compiler crash when enabling libfuzzer instrumentation #69825
Description
Go version
tip
Output of go env in your module/workspace:
GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/khr/Library/Caches/go-build'
GOENV='/Users/khr/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/khr/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/khr/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/Users/khr/sandbox/ro5'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/Users/khr/sandbox/ro5/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='devel go1.24-943abbfd74 Wed Sep 25 08:36:07 2024 -0700'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/khr/Library/Application Support/go/telemetry'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD='/Users/khr/sandbox/ro5/src/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 -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/z9/dty110711l9cr9w3ktv1_2380000gn/T/go-build1149802709=/tmp/go-build -gno-record-gcc-switches -fno-common'What did you do?
package main
type T struct {
A
}
type A struct {
}
//go:noinline
func (a *A) Foo(s [2]string) {
}
Build with
go tool compile -d=libfuzzer=1 test.go
What did you see happen?
This crashes the tip compiler with an error like
<autogenerated>:1: internal compiler error: '(*T).Foo': func (*T).Foo, startMem[b1] has different values, old v1, new v22
What did you expect to see?
no crash