System hanged due to deadlock between CPUs. - Red Hat Customer Portal

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Issue

Our customer encountered a problem that NMI interrupt was received due to BMC watchdog timeout.
Analyzing vmcore, it was seen that it was in deadlock status between CPU1and CPU2, and all CPUs were in hardware interrupt disabled status.
From this situation, fork() on CPU0 also waited indefinitely for lock acquirement and then WDTThread running on CPU0 could not work and accordingly went into watchdog timeout.

Environment

Red Hat Enterprise Linux 5.5
kernel-2.6.18-194.el5

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