/usr/share/go-1.6/src/runtime/testdata/ is in golang-1.6-src 1.6.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/go-1.6/src/runtime/testdata/testprog/
/usr/share/go-1.6/src/runtime/testdata/testprog/crash.go
/usr/share/go-1.6/src/runtime/testdata/testprog/deadlock.go
/usr/share/go-1.6/src/runtime/testdata/testprog/gc.go
/usr/share/go-1.6/src/runtime/testdata/testprog/main.go
/usr/share/go-1.6/src/runtime/testdata/testprog/misc.go
/usr/share/go-1.6/src/runtime/testdata/testprog/signal.go
/usr/share/go-1.6/src/runtime/testdata/testprog/stringconcat.go
/usr/share/go-1.6/src/runtime/testdata/testprog/syscall_windows.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/callback.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/cgo.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/crash.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/dll_windows.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/dropm.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/dropm_stub.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/exec.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/main.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/threadpanic.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/threadpanic_unix.c
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/threadpanic_windows.c
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/threadprof.go
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/windows/
/usr/share/go-1.6/src/runtime/testdata/testprogcgo/windows/win.go
/usr/share/go-1.6/src/runtime/testdata/testprognet/
/usr/share/go-1.6/src/runtime/testdata/testprognet/main.go
/usr/share/go-1.6/src/runtime/testdata/testprognet/net.go
/usr/share/go-1.6/src/runtime/testdata/testprognet/signal.go