Goroutine wranglin (#7556)

* goroutine wranglin

* synchronize WebConn.WritePump

app/oauth.go

@@ -535,11 +535,11 @@ func (a *App) CompleteSwitchWithOAuth(service string, userData io.ReadCloser, em
 		return nil, result.Err
 	}
 
-	go func() {
+	a.Go(func() {
 		if err := SendSignInChangeEmail(user.Email, strings.Title(service)+" SSO", user.Locale, utils.GetSiteURL()); err != nil {
 			l4g.Error(err.Error())
 		}
-	}()
+	})
 
 	return user, nil
 }
@@ -770,11 +770,11 @@ func (a *App) SwitchOAuthToEmail(email, password, requesterId string) (string, *
 
 	T := utils.GetUserTranslations(user.Locale)
 
-	go func() {
+	a.Go(func() {
 		if err := SendSignInChangeEmail(user.Email, T("api.templates.signin_change_email.body.method_email"), user.Locale, utils.GetSiteURL()); err != nil {
 			l4g.Error(err.Error())
 		}
-	}()
+	})
 
 	if err := a.RevokeAllSessions(requesterId); err != nil {
 		return "", err