golang运行时：无法创建新的OS线程（已经有2049； errno = 12）

这是操作系统的限制。我假设您正在使用linux。

clone

ret := clone(cloneFlags, stk, unsafe.Pointer(mp), unsafe.Pointer(mp.g0), unsafe.Pointer(funcPC(mstart)))
sigprocmask(_SIG_SETMASK, &oset, nil)

if ret < 0 {
    print("runtime: failed to create new OS thread (have ", mcount(), " already; errno=", -ret, ")\n")
    if ret == -_EAGAIN {
        println("runtime: may need to increase max user processes (ulimit -u)")
    }
    throw("newosproc")
}

errno=12

ENOMEM Cannot allocate sufficient memory to allocate a task structure
              for the child, or to copy those parts of the caller's context
              that need to be copied.