darwin/amd64, the following program deadlocks:

package main

import "C"

import (
    "fmt"
    "runtime"
    "time"
)

func main() {
    runtime.GOMAXPROCS(100)
    ping := make(chan bool)
    go func() {
        for i := 0; ; i++ {
            select {
            case done := <-ping:
                if done {
                    fmt.Printf("\n")
                    ping <- true
                    return
                }
                fmt.Printf(".")
                ping <- true
            default:
            }
            func() {
                defer func() {
                    recover()
                }()
                var s *string
                *s = ""
            }()
        }
    }()
    time.Sleep(time.Millisecond)
    for i := 0; i < 64; i++ {
        go func() {
            runtime.LockOSThread()
            select {}
        }()
        go func() {
            runtime.LockOSThread()
            select {}
        }()
        time.Sleep(time.Millisecond)
        ping <- false
        select {
        case <-ping:
        case <-time.After(time.Second):
            fmt.Printf("HANG\n")
            return
        }
    }
    ping <- true
    select {
    case <-ping:
    case <-time.After(time.Second):
        fmt.Printf("HANG\n")
        return
    }
}