EC2 Deadlock / Stuck / Hang / Busy Diagnostic Troubleshooter
Use the interactive troubleshooter below to identify your EC2 deadlock, stuck, hang, or busy symptom, review the raw evidence, understand the root cause, and apply the recommended fix.
🚨 Step 1: What specific error symptom are you experiencing?
Please click the most accurate description:
Quick Reference Table
| # | Scenario | Key Error Signal | Root Cause | The Fix |
|---|---|---|---|---|
| 1 | busy — mountall: Device or resource busy | mountall:/proc: unable to mount: Device or resource busy / mountall: root filesystem isn't mounted / General error mounting filesystems. | The system encountered a general error while mounting filesystems during the boot process because a required device or resource was locked or busy. | N/A |
| 2 | stuck, busy — EBS volume stuck in "busy" state during detach | "State": "busy" / "VolumeId": "vol-1234abcd" | An attempt was made to detach a volume that is still mounted to the instance, causing it to become stuck in the busy state indefinitely. | Unmount the volume (sudo umount -d /dev/sdh), choose Force Detach in the console (as a last resort), reboot the instance, or all three. |