MySQL 5.6 crashing after forklift from 5.5.50

Title says it.

Here’s the output to mysqld.log: [url][/url]

Things I know:
[]Data is a mess. Lots of fields that have data longer than the field should allow, 800+ tables across 4 databases
]It doesn’t appear to be related to the missing temporary table
[]I can downgrade back to 5.5.50 and it runs fine
]Adding recovery flags does nothing
[/LIST] I need advice on what to do next. I’m at the end of my rope and knowledge set.