Well. I'm confused. It looks like the right log that the message indicated I was to upload. Was there another named file I was supposed to upload. I no longer have the log from the time it died on March 31st. But I do have the dump file. Or at least what is named factorio-dump-previous.dmp

But as ...

Followup... Appears to have been a memory problem. Tried loading one of the autosaves and got the message "out of memory" closed some tabs, then tried loading the original saved game again, and it worked.

Trying to load a previously saved and working game results in a "and unexpected error" dialog pops up.

Tried a second time, got the same message. Attaching log file.