For context:

It looks like the issue is really with the call to
"set_handler_for_input_source()" on a plugin. renderer->plugin_interface
is null, so dereferencing that fails:

https://paste.ubuntu.com/p/tmcVcvgGXw/

All in all, much easier to comprehend when I think of looking at the
disassembly, or even at SegvAnalysis which has been in the bug for a
while... and easier when you understand the ABI better.

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https://bugs.launchpad.net/bugs/1794292

Title:
  plymouthd crashed with SIGSEGV in /sbin/plymouthd:11 in
  ply_renderer_set_handler_for_input_source ->
  ply_keyboard_stop_watching_for_renderer_input ->
  ply_keyboard_stop_watching_for_input ->
  ply_device_manager_deactivate_keyboards -> on_deactivate

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