I am seeing the below errors on the messages log however no performance issues were reported or kernel panic'd. I would like to know the root cause of it. I would appreciate any help.

Jun 26 03:01:20 server1 kernel: BUG: soft lockup detected on CPU#2!
Jun 26 03:01:20 server1 kernel:
Jun 26 03:01:20 server1 kernel: Call Trace:
Jun 26 03:01:20 server1 kernel: <IRQ> [<ffffffff800b2c85>] softlockup_tick+0xdb/0xed
Jun 26 03:01:20 server1 kernel: [<ffffffff800933d1>] update_process_times+0x42/0x68
Jun 26 03:01:20 server1 kernel: [<ffffffff80073d97>] smp_local_timer_interrupt+0x23/0x47
Jun 26 03:01:20 server1 kernel: [<ffffffff80074459>] smp_apic_timer_interrupt+0x41/0x47
Jun 26 03:01:20 server1 kernel: [<ffffffff8005bcc2>] apic_timer_interrupt+0x66/0x6c
Jun 26 03:01:20 server1 kernel: [<ffffffff80062660>] _spin_unlock_irqrestore+0x8/0x9
Jun 26 03:01:20 server1 kernel: [<ffffffff88074c93>] :scsi_mod:scsi_dispatch_cmd+0x27d/0x2fe
Jun 26 03:01:20 server1 kernel: [<ffffffff88079c04>] :scsi_mod:scsi_request_fn+0x2c1/0x390
Jun 26 03:01:20 server1 kernel: [<ffffffff8005a612>] blk_run_queue+0x41/0x72
Jun 26 03:01:20 server1 kernel: [<ffffffff88078a46>] :scsi_mod:scsi_next_command+0x2d/0x39
Jun 26 03:01:21 server1 kernel: [<ffffffff88078ba2>] :scsi_mod:scsi_end_request+0xbd/0xcb
Jun 26 03:01:21 server1 kernel: [<ffffffff88078d06>] :scsi_mod:scsi_io_completion+0x156/0x32c
Jun 26 03:01:21 server1 kernel: [<ffffffff8001c21e>] __mod_timer+0xb0/0xbe
Jun 26 03:01:21 server1 kernel: [<ffffffff880a33fd>] :sd_mod:sd_rw_intr+0x212/0x23f
Jun 26 03:01:21 server1 kernel: [<ffffffff88078f9b>] :scsi_mod:scsi_device_unbusy+0x67/0x81
Jun 26 03:01:22 server1 kernel: [<ffffffff800372cd>] blk_done_softirq+0x5f/0x6d
Jun 26 03:01:22 server1 kernel: [<ffffffff80011c19>] __do_softirq+0x5e/0xd5
Jun 26 03:01:22 server1 kernel: [<ffffffff8005c330>] call_softirq+0x1c/0x28
Jun 26 03:01:22 server1 kernel: [<ffffffff8006a310>] do_softirq+0x2c/0x85
Jun 26 03:01:22 server1 kernel: [<ffffffff80068ae4>] default_idle+0x0/0x50
Jun 26 03:01:22 server1 kernel: [<ffffffff8005bcc2>] apic_timer_interrupt+0x66/0x6c
Jun 26 03:01:22 server1 kernel: <EOI> [<ffffffff80068b0d>] default_idle+0x29/0x50
Jun 26 03:01:22 server1 kernel: [<ffffffff80046f9c>] cpu_idle+0x95/0xb8
Jun 26 03:01:22 server1 kernel: [<ffffffff80073bb5>] start_secondary+0x45a/0x469
Jun 26 03:01:22 server1 kernel:

see the related threads (at the bottom,left side), probably you can find a solution

Sorry, I am unable to co-relate any of the below post to my problem.

is this occurred during boot? what os you have, what kernel you have?

It is occurring randomly when the server is up and running.
OS is Oracle Enterprise Linux Enterprise Linux Server release 5 (Carthage)
Kernal version: 2.6.18-8.0.0.4.1.el5

I went thro an article which some what is co-relating my issue.

https://access.redhat.com/knowledge/articles/17187