Hi Virendra,

Refer to this KB Getting 'BUG: soft lockup - CPU#0 stuck for Xs!' in /var/log/messages

Potential root causes.

• Soft lockups are situations in which the kernel's scheduler subsystem has not been given a chance to perform its job for more than the limit set by the watchdog threshold, in seconds; they can be caused by defects in the kernel, by hardware issues or by extremely high workloads.

• If lockups are encountered on a virtual system, it is important to ensure that the hypervisor is not overcommitted.

• Hardware issues related to newly installed memory might cause soft lockups.

• Also misconfigurations might cause the issue, like redirecting console output to a serial device and limiting it to i.e. 9600 baud.

• On systems with a very large numbers of CPU cores soft lockups might not indicate a problem.