Hello,
I’m running a three-node replica set on Ubuntu 22.04.5 (x86_64, 64 GB RAM, 8 cores) with MongoDB 7.0.21. Nodes 1 and 2 remain stable, but the mongod service on node 3 periodically crashes, producing a core dump. When this happens, one CPU core shoots to 100% usage while the other cores stay around 5%.
So far, we’ve tried upgrading from 7.0.5 → 7.0.21 based on reports that a newer server version can resolve similar issues, but the crashes persist.
Key details:
- MongoDB version: 7.0.21
- Upgrade history: 7.0.5 → 7.0.21
- OS & hardware: Ubuntu 22.04.5, x86_64, 64 GB RAM, 8 CPU cores on AWS
- Replica set: 3 nodes; only the third node shows instability
- Symptom: Intermittent mongod crash with core dump, one core at 100% utilization
Could you advise on what further steps or diagnostics we should pursue to identify and resolve the root cause of these core dumps? Thank you.