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

$ go version
version go1.16.4 linux/386

Does this issue reproduce with the latest release?

Yes

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

$ go env
$ go env
GO111MODULE=""
GOARCH="386"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="386"
GOHOSTOS="linux"
GOINSECURE="golang.org,googlesource.com"
GOMODCACHE="/home/nilesh/golang/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/nilesh/golang"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_386"
GOVCS=""
GOVERSION="go1.16.4"
GCCGO="gccgo"
GO386="sse2"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/home/nilesh/SVN/go.mod"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m32 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build718813889=/tmp/go-build -gno-record-gcc-switches"

What did you do?

See Go definition of CheckConnection() function attached in Sample.zip. I exported CheckConnection Go function as C function in .so file using following command. This function makes http GET request to google.com using http.client.

 go build -o libapp.so -buildmode=c-shared libapp.go

Then using generated .SO and .h, called exported Go function from my C test program. Below is the command I used to compile and build my C test program.

 gcc -m32 -o ctest ctest.c ./libapp.so

In the C test program, I called exported CheckConnection() function from main() and from forked process. Function call from main() gets succeeded whereas function call from forked process hangs at

  res,err := myClient.Get("https://www.google.com")

Attached is the sample code reproducible. [(Sample.zip)]
Sample.zip

What did you expect to see?

Both calls to CheckConnection() should succeed.

What did you see instead?

CheckConnection() call from main() succeed and CheckConnection() call from forked process hangs.