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Knowledge Base

Failed to Access the OS of the RH2288

Publication Date:  2018-11-02  |   Views:  555  |   Downloads:  0  |   Document ID:  EKB1001961584


Issue Description

The OS of an RH2288 cannot be accessed. The system displays the following information:

CPU 35: Machine Check Exception: 4 Bank 4: 0000000000000000
Kernel panic -not syncing: Uncorrected machine check
(Kernel panic -not syncing: nmi watchdog)

Handling Process

After the mainboard is replaced for three times, the problem persists. During the second replacement, the on-site engineer discovers that a pin in the CPU socket is bent. During the third replacement, the system stops at the preceding information.

The BMC logs show that a CAT error alarm about CPU2 is generated on August 9.

Check the faulty mainboard. A pin in the CPU2 socket is bent. After the faulty mainboard is replaced with a new one, the problem is resolved.

All three mainboards used in the three replacements have a bent pin in the CPU socket.

Root Cause

A pin in the CPU socket is bent. As a result, the OS cannot be accessed after the server is powered on.