System panicked in recalc_task_prio+0x5 due to an invalid register value

Issue

System panicked with this message:

Unable to handle kernel NULL pointer dereference at 000000000000009f RIP: 
 [<ffffffff8008e281>] recalc_task_prio+0x5/0xcc
PGD f911cd067 PUD bd27da067 PMD 0 
Oops: 0000 [1] SMP 
last sysfs file: /devices/system/cpu/cpu31/topology/thread_siblings
CPU 31 
Modules linked in: nfs nfs_acl lockd sunrpc bonding be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb3i libcxgbi cxgb3 libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi ext3 jbd dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec dell_wmi wmi button battery asus_acpi acpi_memhotplug ac parport_pc lp parport joydev nvidia(PU) igb hpilo tpm_tis tpm 8021q hpwdt(U) shpchp serio_raw i2c_core dca tpm_bios pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod usb_storage ahci libata cciss mpt2sas scsi_transport_sas sd_mod scsi_mod ext4 jbd2 crc16 uhci_hcd ohci_hcd ehci_hcd
Pid: 0, comm: swapper Tainted: P     ---- 2.6.18-308.el5 #1
RIP: 0010:[<ffffffff8008e281>]  [<ffffffff8008e281>] recalc_task_prio+0x5/0xcc
RSP: 0018:ffff81087fe67e58  EFLAGS: 00010002
RAX: 0003493ce130d721 RBX: 0003493ce130d721 RCX: 00000000402bc48f
RDX: 000000000000018a RSI: ffff810e8e5b17a0 RDI: 000000000000001f
RBP: ffff81087fe67e60 R08: 0000000000000010 R09: ffff81087fe61e38
R10: 0000000000000001 R11: 0000000000000000 R12: 000000000000001f
R13: ffff810e8e5b17a0 R14: ffff810e8e5b17a0 R15: ffff81089c1a05a0
FS:  0000000000000000(0000) GS:ffff81107f89d9c0(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 000000000000009f CR3: 0000000fb8f5d000 CR4: 00000000000006a0
Process swapper (pid: 0, threadinfo ffff81087fe60000, task ffff81107f8a8100)
Stack:  0003493ce130d721 ffff81087fe67f00 ffffffff80046b55 0000000080046c02
 000000000000000f 0000001f9c1a1880 0000000000000001 0000001f00000000
 0000000000000000 ffffffff8045b640 ffff81087fe67f48 ffffffff8008fa8e
Call Trace:
 <IRQ>  [<ffffffff80046b55>] try_to_wake_up+0x3c5/0x484
 [<ffffffff8008fa8e>] rebalance_tick+0x183/0x3cd
 [<ffffffff8009a3a9>] process_timeout+0x0/0x5
 [<ffffffff8009a18f>] run_timer_softirq+0x18d/0x23a
 [<ffffffff80012551>] __do_softirq+0x89/0x133
 [<ffffffff8005e2fc>] call_softirq+0x1c/0x28
 [<ffffffff8006d646>] do_softirq+0x2c/0x7d
 [<ffffffff80056c59>] mwait_idle+0x0/0x20
 [<ffffffff8005dc8e>] apic_timer_interrupt+0x66/0x6c
 <EOI>  [<ffffffff8006b9cf>] mwait_idle_with_hints+0x66/0x67
 [<ffffffff80056c65>] mwait_idle+0xc/0x20
 [<ffffffff80048f92>] cpu_idle+0x95/0xb8
 [<ffffffff80078ae2>] start_secondary+0x479/0x488