We are getting Assertion failure every time memory usage of MySQL spikes up to overall system's memory.

Every time Assertion failure reports different file in code location "/home/buildbot/buildbot/build/mariadb-10.3.11/storage", but every time we see same **buffer overflow detected** statement in mysqld log.

We only see "buffer overflow detected" like its a pattern. I've attached stack trace as well my.cnf file.

We are having below server with hardware configuration,
Ubuntu 16.04.5 LTS
Memory: 72G
Cores: 36
Our Scenario: writing a 50k as a batch insert, we insert about more than 100G of data.

• • • We have a few suspects, but still, we are unable to get convinced what was the issue.

1. We are writing about 100 inserts with "on duplicate key update" - is that possible to get all indexes back into memory as pages(old/young pages) and it's not clearing
2. I was trying to insert same 50k inserts for about 2m records, I see, there was memory spike about to 2%(based on data size), every time I run it, again and again, it gets added up.

Important: when we see this issue, table data also getting corrupted. that's the huge worries on our side.