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The gui_fb client may have installed a custom sync_sigh and mode_sigh. Reset those signal handlers at the GUI server should the client disappear. Otherwise, the GUI server (nitpicker) continues to attempt transmitting sync signals to the no-longer existing component, spamming the log with "Warning: invalid signal-context capability" messages.
This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.