Db.savechanges() line freezes in EF

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MVC5

entity-framework

When the line db.savechanges() hits the breakpoint. Nothing happens. no errors in the catch block. The browser just freezes and data is not saved. I am using oracle with asp.net mvc.

I get no response from the browser or VS 15. All i get is the loading sign in the browser tab. i left it for 10 mins. what else do u want to know? i have cleared my cache before running this. _userService.Add(model); This line works perfectly but the latter "_userService.AddUserPermission(permission);" does not work

What I have tried:

public ResponseResult AddUserPermission(USER_PERMISSION permission)
{
    try
    {

        _db.Entry(permission).State = EntityState.Modified;
        _db.SaveChanges();
        return new ResponseResult();
    }
    catch (Exception ex)
    {
        //return new ResponseResult();
        return new ResponseResult(ResutlType.Error, ex.Message);
    }


}
[HttpPost]
[CustomAuthorize("Admin")]
public ActionResult Create(USER model)
{
    try
    {

        string moduleId = Request.Form["ModuleId"];
        string isSelected = Request.Form["IsSelected"];

        model.DATE_CREATED = DateTime.Now;
        model.DATE_UPDATED = DateTime.Now;
        model.STATUS = (int)Status.Active;

        var userPermission = processPermissionData(moduleId, isSelected);
        //userPermission contains a list of permissions which i am trying to save
        _userService.Add(model);

        foreach (var permission in userPermission)
        {
            _userService.AddUserPermission(permission);
        }

        return RedirectToAction("Index");
    }
    catch
    {
        return View();
    }
}