CentOS Stream 9 – Common Problem 096 – Diagnosis and Fix

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

bpftrace fails to load on Stream kernel on CentOS Stream 9 disrupts services and slows incident response until the root cause is resolved.

Environment & Reproduction

BPF programs fail because debug-info packages and matching kernel-devel are missing.

bpftrace --version
uname -r
rpm -qa | grep kernel

Root Cause Analysis

Misalignment between kernel configuration and CentOS Stream 9 defaults causes the failure path described above.

Quick Triage

Confirm package state, service status, and recent changes before deeper diagnostics.

systemctl status
rpm -qa | grep -i 
journalctl -p err -b --no-pager | tail -100

Step-by-Step Diagnosis

Capture detailed logs, configuration deltas, and runtime state to isolate the failing component.

dmesg | grep -i bpf
bpftrace -e 'tracepoint:syscalls:sys_enter_openat { @ = count(); }'
ls /sys/kernel/btf

Solution – Primary Fix

Apply the targeted configuration change and restart the relevant services to restore expected behavior.

sudo dnf install -y bpftrace bcc-tools kernel-devel-$(uname -r) kernel-modules-extra-$(uname -r)
sudo dnf debuginfo-install -y kernel
sudo modprobe nf_conntrack

Solution – Alternative Approaches

Use perf trace when bpftrace BTF requirements cannot be met.

Verification & Acceptance Criteria

Validate the fix with deterministic checks and ensure no regressions in dependent services.

bpftrace -e 'BEGIN { printf("okn"); exit(); }'
bpftool prog show

Rollback Plan

Revert configuration and restart services to return to the previous known-good state.

dnf remove bpftrace kernel-devel-$(uname -r)

Prevention & Hardening

Pin bpftrace versions to kernel and verify BTF availability.

Automate patch management and compliance across your fleet with our DevOps services.

Related Errors & Cross-Refs

Related: BTF, kernel-devel, bcc; see also adjacent topics in the CentOS Stream 9 common problems series.

Related tutorial: View the step-by-step tutorial for centos-stream-9.

View all centos-stream-9 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

CentOS Stream documentation, Red Hat upstream guides, and CentOS Stream 9 release notes covering this subsystem.