pn02 crashed again after ~2d21h uptime despite all mitigations (amdgpu blacklist, max_cstate=1, NMI watchdog, rasdaemon). NMI watchdog didn't fire and rasdaemon recorded nothing, confirming hard lockup below NMI level. Unit is unreliable. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>