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How to Fix “Proxmox AER Corrected Error Received”

AER, short for Advanced Error Reporting is a feature within the PCI Express standard. It offers a consistent way for devices to report hardware errors. AER enables devices to send detailed error information to the operating system, which can then determine the appropriate response.

By identifying errors early and accurately, AER helps maintain system stability and performance.

An Overview:

1. Types of Errors Reported by AER
2. Deciphering AER Messages
3. Common Causes of AER Messages
4. Troubleshooting AER Messages

Types of Errors Reported by AER

AER can report two types of errors:

• Corrected Errors:

  These are errors that have been automatically corrected by the hardware. While they do not typically impact system stability or performance, they are logged for diagnostic purposes.

  Corrected errors are usually informational, indicating minor issues that have been handled by the system.
• Uncorrected Errors:

  These errors cannot be automatically corrected and may require manual intervention. Uncorrected errors are more severe and could potentially lead to system instability or failure.

  They often signal a need for further investigation to prevent potential problems.

Deciphering AER Messages

When we run into a message like “AER corrected error received,” it lets us know that a PCIe device in our system has experienced an error, but the error was corrected by the hardware or firmware.

While these messages are generally not critical, they can provide valuable insights into potential hardware issues that might require further investigation.

In other words, monitoring these messages can help identify patterns or recurring problems that may need attention.

Common Causes of AER Messages

Several factors can trigger AER messages, including:

• Hardware Issues:

  Problems with the PCIe device, such as a faulty card, loose connections, or issues with the motherboard, can lead to AER messages. For example, a failing network card or an improperly seated graphics card may cause corrected or uncorrected errors.
• Driver Issues:
  In some cases, device drivers might report errors due to bugs or incompatibility with the operating system or other drivers. Updating or reinstalling the driver can often resolve these issues.
• Firmware Issues:

  Outdated or buggy firmware on the device or motherboard can also cause AER errors. Regular firmware updates are essential to ensure compatibility and minimize errors.
• Configuration Issues:

  Incorrect BIOS/UEFI settings related to PCIe devices can lead to AER errors. Settings like PCIe speed, link state power management, and Advanced Error Reporting options can all impact error reporting.

Troubleshooting AER Messages

If we run into AER messages, our Experts recommend these steps to diagnose and fix the underlying issue:

1. Start by examining the system logs to gather more details about the error. Use commands like:

   dmesg | grep -i aer

   Or

   journalctl | grep -i aer

   These commands will filter out AER-related entries from the logs, providing insights into which device is reporting errors and what type of errors are occurring.
2. Make sure that the system’s BIOS/UEFI, motherboard firmware, and all device drivers are up to date.

   Manufacturers frequently release updates to fix bugs, improve performance, and ensure hardware compatibility. Check the manufacturer’s website for the latest updates and apply them as necessary.
3. Also, make sure that all PCIe devices are properly seated in their slots and that there are no loose connections. Reseat the cards if necessary, and inspect the connectors for any signs of damage or corrosion.
4. Use tools like `smartctl` (for storage devices) or vendor-specific diagnostic tools to check the health of your hardware components.

   Identifying and replacing failing hardware can prevent errors from recurring and safeguard the system’s stability.
5. Review the BIOS/UEFI settings related to PCIe devices. Parameters such as PCIe speed, link state power management, and AER settings may affect error reporting. Adjust these settings to align with the manufacturer’s recommendations or to mitigate errors.
6. If corrected errors are infrequent and do not cause any noticeable issues, they might not require immediate action. However, frequent errors could indicate a more serious underlying problem.

   Monitoring the frequency and pattern of errors can help determine if further investigation or intervention is needed.

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Conclusion

Advanced Error Reporting plays a key role in maintaining the stability and performance of systems using PCI Express devices. While many AER messages are informational and do not require immediate action, understanding their causes and how to troubleshoot them can help prevent minor issues from escalating into critical failures.

In brief, our Support Experts demonstrated how to fix “Proxmox AER Corrected Error Received”.