foo.lua

      local h = levee.Hub()                                                                                           
                                                                                                                      
      local r, w = h.io:pipe()                                                                                        
                                                                                                                      
      h:spawn(function()                                                                                              
        local err = w:write(("X"):rep(128*1024))                                                                      
        print(err)                                                                                                    
        w:close()                                                                                                     
      end)                                                                                                            
                                                                                                                      
      local buf = d.Buffer()                                                                                          
      while true do                                                                                                   
        buf:ensure(4096)                                                                                              
        local err, n = r:read(buf:tail())                                                                             
        if err then break end                                                                                         
        buf:bump(n)                                                                                                   
      end                                                                                                             
      print(buf:value())  

gistfile1.txt

bad address in system call argument (system.EFAULT)
cdata<unsigned char *>: 0x0c1b0000      65536