Issue

• Kernel panic at __rb_rotate_left+0xc/0x50
• System crashed with __rb_rotate_left.
• System crashed with following call traces

BUG: unable to handle kernel NULL pointer dereference at virtual address 00000008
 printing eip:
c04dc838
*pde = 2293f001
Oops: 0000 [#1]
SMP 
last sysfs file: /class/ipmi/ipmi0/dev
Modules linked in: gab(U) llt(U) nfsd exportfs lockd nfs_acl sunrpc autofs4 ipmi_devintf ipmi_si ipmi_msghandler bonding ipv6 dmpjbod(U) dmpap(U) dmpaa(U) fdd(U) vxportal(U) vxfs(U) emcpdm(U) emcpgpx(U) emcpmpx(U) emcp(U) emcplib(U) dm_mirror dm_mod video sbs i2c_ec button battery asus_acpi ac parport_pc lp parport st ide_cd i2c_i801 cdrom i2c_core e1000 serio_raw sg pcspkr vxspec(U) vxio(U) vxdmp(U) usb_storage qla2xxx scsi_transport_fc mptsas scsi_transport_sas mptspi mptscsih scsi_transport_spi sd_mod scsi_mod mptbase ext3 jbd ehci_hcd ohci_hcd uhci_hcd
CPU:    1
EIP:    0060:[<c04dc838>]    Tainted: PF     VLI
EFLAGS: 00010286   (2.6.18-8.el5PAE #1) 
EIP is at __rb_rotate_left+0xc/0x50
eax: eff69ec8   ebx: eff69ec8   ecx: e269dac8   edx: 00000000
esi: ead18948   edi: c078f8e0   ebp: e269dac8   esp: e3cddefc
ds: 007b   es: 007b   ss: 0068
Process sshd (pid: 10156, ti=e3cdd000 task=de548550 task.ti=e3cdd000)
Stack: e269d1c8 eff69ec8 e269d1c8 c04dc958 c078f8e0 e269d1d0 e3cddf8f e269db14 
       e3fd6bc0 c04b254e 000000ca c06701c0 00000000 e269dac0 e269dac0 0000001b 
       e3cddf84 de548550 00000000 de548550 c04b330d 00000064 de548550 1f3f0000 
Call Trace:
 [<c04dc958>] rb_insert_color+0x8c/0xad
 [<c04b254e>] key_alloc+0x263/0x31f
 [<c04b330d>] keyring_alloc+0x1e/0x4f
 [<c04b43e2>] install_session_keyring+0x52/0xb5
 [<c04b49c1>] join_session_keyring+0x1c/0xa7
 [<c0403e95>] sysenter_past_esp+0x56/0x79
 =======================
Code: 00 00 00 8b 45 04 83 c1 14 d3 e2 85 d0 75 05 09 d0 89 45 04 5a 89 f0 59 5b 5e 5f 5d c3 90 90 57 89 d7 56 53 8b 50 04 89 c3 8b 30 <8b> 4a 08 83 e6 fc 85 c9 89 48 04 74 09 8b 01 83 e0 03 09 d8 89 
EIP: [<c04dc838>] __rb_rotate_left+0xc/0x50 SS:ESP 0068:e3cddefc