What does "kernel BUG at fs/namei.c:2448!" means in /var/log/messages ?

Issue

~ Snippet of kernel stack trace from /var/log/messages

Jan 28 23:55:11 Server kernel: kernel BUG at fs/namei.c:2448!
Jan 28 23:55:11 Server kernel: invalid operand: 0000 [#1]
Jan 28 23:55:11 Server kernel: SMP
Jan 28 23:55:11 Server kernel: Modules linked in: nfs lockd nfs_acl sunrpc sg mptctl mptbase dell_rbu i2c_dev i2c_core ipmi_devintf ipmi_si ipmi_msghandler joydev sddlmfdrv(U) sddlmadrv(U) button battery ac uhci_hcd ehci_hcd hw_random shpchp bnx2 bonding(U) qla2400 qla2xxx scsi_transport_fc dm_snapshot dm_zero dm_mirror ext3 jbd linear dm_mod ata_piix libata megaraid_sas(U) sd_mod scsi_mod
Jan 28 23:55:11 Server kernel: CPU:    8
Jan 28 23:55:11 Server kernel: EIP:    0060:[<0216bdee>]    Tainted: P      VLI
Jan 28 23:55:11 Server kernel: EFLAGS: 00010246   (2.6.9-89.0.23.ELhugemem)
Jan 28 23:55:11 Server kernel: EIP is at page_put_link+0x26/0x46
Jan 28 23:55:11 Server kernel: eax: 00000000   ebx: 00000000   ecx: a4a02c00   edx: a9eac8b0
Jan 28 23:55:11 Server kernel: esi: 00000000   edi: ff003000   ebp: 6e8b7f0c   esp: 6e8b7e78
Jan 28 23:55:11 Server kernel: ds: 007b   es: 007b   ss: 0068
Jan 28 23:55:11 Server kernel: Process httpd (pid: 11138, threadinfo=6e8b7000 task=b17c9630)
Jan 28 23:55:15 Server kernel: Stack: 6e8b7000 02168dc3 00000150 00000158 00000048 a4a02cc4 00000001 00000000
Jan 28 23:55:15 Server kernel:        6320a02a bf8f2280 a4a02cc4 e1a89347 00000008 6320a021 084b7ef8 c019aafc
Jan 28 23:55:15 Server kernel:        c1a8af80 6e8b7f0c 00000001 0216941c 6320a000 6e8b7000 6e8b7f0c 6320a000
Call Trace:
Jan 28 23:55:15 server kernel:  [<02168dc3>] __link_path_walk+0x602/0xc25
Jan 28 23:55:15 server kernel:  [<0216941c>] link_path_walk+0x36/0xa1
Jan 28 23:55:15 server kernel:  [<021697a1>] path_lookup+0x14b/0x183
Jan 28 23:55:15 server kernel:  [<021698f9>] __user_walk+0x21/0x51
Jan 28 23:55:15 server kernel:  [<02164a4f>] vfs_stat64+0x14/0x3a
Jan 28 23:55:15 server kernel:  [<02164ff5>] sys_stat64+0xf/0x23
Jan 28 23:55:15 server kernel:  [<02157e4b>] put_user_size+0x29/0x2d
Jan 28 23:55:15 server kernel:  [<02126b27>] sys_gettimeofday+0x25/0x55