KB 430087 - Resolution of CPU CATERR Error Due to Socket Contamination

KB 430087 - Resolution of CPU CATERR Error Due to Socket Contamination

Resolution of CPU CATERR Error Due to Socket Contamination

Issue:
Servers were reporting a CPU CATERR error during POST or system logs.

Cause:
Upon investigation, the CPU was reseated, and it was discovered that heatsink compound particles had fallen into the CPU socket pins, causing poor contact. This led to the CPU reporting Cache Allocation Technology (CAT) errors.

Resolution Steps:

  1. Power Down and Disconnect:
    • Shut down the server completely and disconnect all power sources.
  2. Remove CPU and Heatsink:
    • Carefully remove the heatsink and CPU.
  3. Inspect Socket and CPU Pins:
    • Check the CPU socket for foreign particles or contamination.
    • Inspect CPU pins for any damage or debris.
  4. Clean CPU Socket:
    • Use a soft brush to gently remove particles from the socket.
    • Optionally, use isopropyl alcohol (ISO Propyl) for cleaning stubborn residue.
    • Allow the socket to dry completely before proceeding.
  5. Reseat CPU and Memory Modules:
    • Carefully reseat the CPU into the cleaned socket.
    • Reseat all memory modules to ensure proper connection.
  6. Reassemble and Power On:
    • Reattach the heatsink.
    • Reconnect power and boot the server.

Result:

After cleaning the CPU socket and reseating the CPU and memory, the CPU CATERR error was resolved and the server booted normally.

Preventive Recommendations:

  • Avoid applying excessive thermal compound that could fall onto CPU socket.
  • Regularly inspect and clean server components during maintenance.
  • Handle CPUs and sockets carefully to prevent bent pins or contamination.

 

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