title: crash in security framework with call SecItemCopyMatching
body: <p>we have a bug run in <code>monkey</code>, the call back stack like this:</p>
  
  <pre><code>Thread 0 name:  Dispatch queue: com.apple.main-thread
  Thread 0 Crashed:
  0   libsystem_kernel.dylib          0x000000018b853224 mach_msg_trap + 8
  1   libsystem_kernel.dylib          0x000000018b85309c mach_msg + 72
  2   libdispatch.dylib               0x000000018b744ee4 _dispatch_mach_send_and_wait_for_reply + 540
  3   libdispatch.dylib               0x000000018b7452e8 dispatch_mach_send_with_result_and_wait_for_reply + 56
  4   libxpc.dylib                    0x000000018b96cee0 xpc_connection_send_message_with_reply_sync + 196
  5   Security                        0x000000018cc8fe44 securityd_message_with_reply_sync + 200
  6   Security                        0x000000018cc90114 securityd_send_sync_and_do + 80
  7   Security                        0x000000018ccb5c88 __SecItemCopyMatching_block_invoke_2 + 212
  8   Security                        0x000000018ccb7730 __SecItemAuthDoQuery_block_invoke + 304
  9   Security                        0x000000018ccb478c SecItemAuthDo + 1116
  10  Security                        0x000000018ccb5424 SecItemAuthDoQuery + 492
  11  Security                        0x000000018ccb5ba8 __SecItemCopyMatching_block_invoke + 116
  12  Security                        0x000000018ccb3c3c SecOSStatusWith + 52
  13  Security                        0x000000018ccb5aec SecItemCopyMatching + 396
  </code></pre>
  
  <p>I want obtain <code>bundleSeedID</code> and my code:</p>
  
  <pre><code>NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                         (__bridge NSString *)kSecClassGenericPassword, (__bridge NSString *)kSecClass,
                         @"bundleSeedID", kSecAttrAccount,
                         @"", kSecAttrService,
                         (id)kCFBooleanTrue, kSecReturnAttributes,
                         nil];
  CFDictionaryRef result = nil;
  OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, (CFTypeRef *)&amp;result);
  </code></pre>
  
  <p>this code is copy from net, I don't know what's wrong, need you help!</p>