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MongoDB 4.2.7 Bug - Off-by-one overflow in block-modification bitmaps for incremental backup
26 June,2020 by Rambler
A bug on MongoDB 4.2.7 has been identified- and a fix is included in 4.2.8 .Certain conditions are required for the bug to appear - detailed below. Based on the supporting documentation for the MongoDB 4.2.7 bug to occur:
- Must be running MongoDB 4.2.7.
- Managed by Ops Manager 4.2.13+ or managed in Cloud Manager with MongoDB agent version v10.14.0+.
- Incremental backups are enabled.
- The DB server has collection files greater than 2GB on disk.
- These collections are modified anytime after backups are enabled.
If these conditions are met , there is a possibility that MongoDB will improperly overwrite memory.
Read here for greater detail supplied by MongoDB
To fix you will need to upgrade the Replica Set version from 4.2.7 to 4.2.8 . The upgrade does require a host restart - so ensure all checks are made regarding data recovery points and any existing users connected which which you can get using How to list MongoDB connections - client ip and port
Author: Rambler (http://www.dba-ninja.com)
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