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kernel BUG at lib/list_debug.c:31!
invalid opcode: 0000 [#1]
SMP 
last sysfs file: /block/dm-0/range
Modules linked in: i2c_dev i2c_core nfs fscache nfs_acl lockd sunrpc ipv6 xfrm_nalgo crypto_api ipt_REJECT xt_tcpudp xt_state ip_conntrack nfnetlink iptable_filter iptable_raw ip_tables x_tables dm_multipath scsi_dh scsi_mod parport_pc lp parport xennet pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod xenblk ext3 jbd uhci_hcd ohci_hcd ehci_hcd
CPU:    0
EIP:    0061:[<c04ee555>]    Not tainted VLI
EFLAGS: 00210096   (2.6.18-194.3.1.el5xen #1) 
EIP is at __list_add+0x39/0x52
eax: 00000048   ebx: e84c41cc   ecx: 00000001   edx: f5416000
esi: e7c99578   edi: d793c4f4   ebp: 2d2d9547   esp: c0738d9c
ds: 007b   es: 007b   ss: 0069
Process httpd (pid: 18545, ti=c0738000 task=d7dfd000 task.ti=d81af000)
Stack: c064aa45 e84c41cc 00000000 e84c41c0 d793c4f0 00000000 c042e531 00000001 
       00000000 d793c480 c042e5a0 d793c480 e7cbe43c ee2f796f d793c480 e7cbe43c 
       ee2f7b4c e7cbe4a8 d793c480 e7cbe43c e7cbe4ac 2d2d9547 ee2f7b83 e7cbe4a8 
Call Trace:
 [<c042e531>] __queue_work+0x1f/0x43
 [<c042e5a0>] queue_work+0x4b/0x50
 [<ee2f796f>] rpc_make_runnable+0x71/0x9a [sunrpc]
 [<ee2f7b4c>] __rpc_do_wake_up_task+0x118/0x132 [sunrpc]
 [<ee2f7b83>] __rpc_wake_up_task+0x1d/0x25 [sunrpc]
 [<ee2f81df>] rpc_wake_up+0x2a/0x51 [sunrpc]
 [<ee2f6f0c>] xs_tcp_state_change+0x102/0x145 [sunrpc]
 [<c05ed1d3>] tcp_rcv_state_process+0x30e/0xcb6
 [<c05f34a1>] tcp_v4_do_rcv+0x26e/0x2b6
 [<c05bce10>] __pskb_pull_tail+0x1a3/0x220
 [<c042530c>] local_bh_enable+0x5/0x81
 [<c05f57d2>] tcp_v4_rcv+0x8bb/0x90d
 [<c05dc73c>] ip_local_deliver_finish+0x0/0x197
 [<c05dcf9d>] ip_local_deliver+0x159/0x204
 [<c05dce0a>] ip_rcv+0x47f/0x4b9
 [<c05c15db>] netif_receive_skb+0x3f9/0x41d
 [<ee0e1377>] netif_poll+0x970/0xab4 [xennet]
 [<c05c3506>] net_rx_action+0xa4/0x1bb
 [<c04255a7>] __do_softirq+0x8b/0x11c
 [<c0406e35>] do_softirq+0x56/0xae
 [<c0447d54>] __do_IRQ+0x0/0xd6
 [<c0406f42>] do_IRQ+0xb5/0xc3
 [<c055aa97>] evtchn_do_upcall+0xfa/0x191
 [<c04055cf>] hypervisor_callback+0x33/0x3c
 =======================
Code: 74 17 50 52 68 08 aa 64 c0 e8 c0 2a f3 ff 0f 0b 1a 00 ba a9 64 c0 83 c4 0c 8b 06 39 d8 74 17 50 53 68 45 aa 64 c0 e8 a3 2a f3 ff <0f> 0b 1f 00 ba a9 64 c0 83 c4 0c 89 7b 04 89 1f 89 77 04 89 3e 
EIP: [<c04ee555>] __list_add+0x39/0x52 SS:ESP 0069:c0738d9c
 <0>Kernel panic - not syncing: Fatal exception in interrupt