runtime/cgo: naming a DLL exported function as "CloseHandle" causes all DLL exported functions to deadlock #73083
Description
Go version
go version go1.24.1 windows/amd64
Output of go env in your module/workspace:
set AR=ar
set CC=gcc
set CGO_CFLAGS=-O2 -g
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-O2 -g
set CGO_ENABLED=1
set CGO_FFLAGS=-O2 -g
set CGO_LDFLAGS=-O2 -g
set CXX=g++
set GCCGO=gccgo
set GO111MODULE=
set GOAMD64=v1
set GOARCH=amd64
set GOAUTH=netrc
set GOBIN=
set GOCACHE=C:\Users\minwoo\AppData\Local\go-build
set GOCACHEPROG=
set GODEBUG=
set GOENV=C:\Users\minwoo\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFIPS140=off
set GOFLAGS=
set GOGCCFLAGS=-m64 -mthreads -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=C:\Users\minwoo\AppData\Local\Temp\go-build1807792170=/tmp/go-build -gno-record-gcc-switches
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMOD=D:\WORKS\github\abyss_neighbor_discovery\go.mod
set GOMODCACHE=C:\Users\minwoo\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\minwoo\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\Program Files\Go
set GOSUMDB=sum.golang.org
set GOTELEMETRY=local
set GOTELEMETRYDIR=C:\Users\minwoo\AppData\Roaming\go\telemetry
set GOTMPDIR=
set GOTOOLCHAIN=auto
set GOTOOLDIR=C:\Program Files\Go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=go1.24.1
set GOWORK=
set PKG_CONFIG=pkg-configWhat did you do?
I am writing a DLL in golang, and found naming a function "CloseHandle" causes all DLL exported functions to never return. There was no warning, or error when building the DLL.
The following is the code.
//export SimpleFunc
func SimpleFunc() C.int {
return C.int(7)
}
//export CloseHandle
func CloseHandle(handle C.uintptr_t) {
cgo.Handle(handle).Delete()
}
What did you see happen?
When an external binary calls SimpleFunc(), it never returns.
What did you expect to see?
The call should return 7.