Golang Atomic 32-bit machine problem

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A atomic was found during the test. AddInt64 () reported memory error
The 32-bit window,linux is not working properly
Example code:

Package Mainimport (    "FMT"    "sync/atomic") type Item struct{    //c int32    D int32    a Int64}type Obj struct{    list Map[string]*item   }func (ob *obj) Init () {    ob.list = make (Map[string]*item)    ob.list["a"] = &item{}}func (ob *obj) Add () {    atomic. AddInt64 (&ob.list["a"].a,12)    FMT. Println (ob.list["a"].a)}func main () {    fmt. Println ("Hello World")    obj: = new (obj)    obj. Init ()          FMT. Printf ("%v\n", obj.list["a"])    obj. ADD ()           }

Finally, the problem is that the struct item is preceded by an int type that must be an even number to function correctly, and the comment line that removes the above code will work correctly.
Reckoned possible causes associated with the underlying allocated memory when the struct is initialized.
The workaround is to be careful when you define item temporarily