Seems that large forum posts are causing the forum_cron cronjob to abort, with the above message. Unfortunately, it is also happening during the course backups through the cronjob. So far, files such as:
all crash with the "possible integer overlow" error.
The forum posts can go out to as many as 3800 people before crashing. However, it needs to go to 14K people.
- will be (partly) resolved by
MDL-14269 META: Backup performance