My site started running the "add-on method test_extract" today - it created a 3+GB log file and is now creating a second. No Akeeba back is schedule or has been launched at this time. I do not use integrity check on backups.
It started with
"Starting step number 16003"
Kitterad :: Ticking the domain object
Then repeated running of add-on method test extract and and error undefined property - repeated for GBytes
I cannot attach the log file (too big). But here is a screen capture of the beginning
