build: misc/cgo/testcshared failure #23784
Description
What version of Go are you using (go version)?
I'm using go version go1.9.4 linux/amd64 to build the sources from the latest master, i.e. go version devel +829b64c1ea linux/amd64.
Does this issue reproduce with the latest release?
Yes.
What operating system and processor architecture are you using (go env)?
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/inviz/go"
GORACE=""
GOROOT="/usr/lib/go-1.9"
GOTOOLDIR="/usr/lib/go-1.9/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build762069868=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
What did you do?
cd go/src
./all.bashWhat did you expect to see?
ALL TESTS PASSED
What did you see instead?
Building Go cmd/dist using /usr/lib/go-1.9.
Building Go toolchain1 using /usr/lib/go-1.9.
Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.
Building Go toolchain2 using go_bootstrap and Go toolchain1.
Building Go toolchain3 using go_bootstrap and Go toolchain2.
Building packages and commands for linux/amd64.
##### Testing packages.
...
##### ../misc/cgo/testcshared
--- FAIL: TestUnexportedSymbols (2.95s)
cshared_test.go:349: run: [go build -buildmode=c-shared -installsuffix testcshared -o libgo2.so libgo2]
cshared_test.go:363: run: [gcc -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build486143289=/tmp/go-build -gno-record-gcc-switches -I pkg/linux_amd64_shared -o testp2 main2.c -Wl,--no-as-needed libgo2.so]
cshared_test.go:369: command failed: [./testp2]
exit status 2
BUG: failed to read any data from pipe
FAIL
This test is very unstable, though, and may fail or may pass with approximate probability of 1/2.