Comment 26 for bug 1794292

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.