Subject: macOS X2GoClient keyboard map updates crash specific server applications, spike server CPU usage

From: "Yearke, Thomas" <[email-masked]>
Date: Tue, 3 Nov 2020 00:42:39 +0000

Package: x2goclient
Version: 4.1.2.2
Tag: patch

When the macOS version of X2GoClient is connected to a server, it updates the session's keyboard map every 10 seconds. Depending on how other programs running on the server respond to keyboard map changes, the repeated updates can cause brief CPU usage spikes or (in the case of one of our applications) they can cause freezes and crashes.

The attached patch modifies the macOS client to only run the keyboard map update once on session startup. Testing done on my devices showed that this change resolved the issue without introducing noticeable side effects. However, I was not able to find the reason why the keyboard map is being updated regularly, so this may (re)introduce a problem I'm not aware of.

Client OS: macOS 10.14.6
Client Software: X2GoClient 4.1.2.2
Server OS: CentOS 7.8
Server Desktop Environment: XFCE 4
Server x2goserver Version: 4.1.0.3
Server x2goserver-xsession Version: 4.1.0.3
Server nxagent Version: 3.5.99.24

Thank you for your consideration!

Tom Yearke
Software Engineer
Science and Engineering Node Services
University at Buffalo