From f193b6da1ab23511f386f5e59627b612a6940532 Mon Sep 17 00:00:00 2001
From: Maurice Parker <mo@vincode.io>
Date: Wed, 29 Apr 2020 15:36:28 -0500
Subject: [PATCH] Prevent deadlocks by notifying group completion on background
 thread

---
 Frameworks/Account/CloudKit/CloudKitZone.swift | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Frameworks/Account/CloudKit/CloudKitZone.swift b/Frameworks/Account/CloudKit/CloudKitZone.swift
index 3486ab6f1..af8f91e1f 100644
--- a/Frameworks/Account/CloudKit/CloudKitZone.swift
+++ b/Frameworks/Account/CloudKit/CloudKitZone.swift
@@ -456,11 +456,15 @@ extension CloudKitZone {
 					}
 				}
 				
-				group.notify(queue: DispatchQueue.main) {
+				group.notify(queue: DispatchQueue.global(qos: .background)) {
 					if errorOccurred {
-						completion(.failure(CloudKitZoneError.unknown))
+						DispatchQueue.main.async {
+							completion(.failure(CloudKitZoneError.unknown))
+						}
 					} else {
-						completion(.success(()))
+						DispatchQueue.main.async {
+							completion(.success(()))
+						}
 					}
 				}