What happened here was... he was copy pasting the text to grow its size exponentially. After about 20 or so copy pasting cycles, the UI of the chat app became unresponsive on the UI thread (because of the copy paste operation it was handling) and some watchdog process decided the chat app needed to be terminated because it was unresponsive for longer than a configured time span. This isn't a vulnerability and doesn't warrant a CVE - the system was operating normally.

That's my take anyway. Thoughts?