Description
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 Output
$ 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.