[122349.906451] divide error: 0000 [#1] SMP 

[122349.906465] last sysfs file: /sys/devices/xen/vbd-16756/block/sdx4/stat

[122349.906470] CPU 0 

[122349.906474] Modules linked in: raid0 ipt_REJECT ipt_LOG xt_limit xt_tcpudp ipt_addrtype xt_state ip6table_filter ip6_tables ipv6 nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp nf_conntrack iptable_filter ip_tables md_mod x_tables

[122349.906511] Pid: 4228, comm: beam.smp Not tainted 2.6.32-305-ec2 #9-Ubuntu 

[122349.906515] RIP: e030:[<ffffffff8102ceb4>]  [<ffffffff8102ceb4>] update_sd_lb_stats+0x3a4/0x4e0

[122349.906527] RSP: e02b:ffff8804421db9f8  EFLAGS: 00010046

[122349.906530] RAX: 0000000000000000 RBX: ffff8804421dbbe4 RCX: 0000000000000001

[122349.906534] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

[122349.906538] RBP: ffff8804421dbad8 R08: ffff88000184dbc8 R09: 0000000000000040

[122349.906542] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff

[122349.906547] R13: 000000000000a380 R14: ffffffffffffffff R15: 0000000000000000

[122349.906555] FS:  00007f1a08a2c710(0000) GS:ffff880001846000(0000) knlGS:0000000000000000

[122349.906560] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b

[122349.906564] CR2: 00007f19fc44a000 CR3: 0000000443d6f000 CR4: 0000000000002620

[122349.906568] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

[122349.906572] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000000

[122349.906577] Process beam.smp (pid: 4228, threadinfo ffff8804421da000, task ffff880440d00340)

[122349.906582] Stack:

[122349.906584]  0000000000000001 ffff8804421dba78 00008804421dba28 0000000000000000

[122349.906589] <0> ffff88000184daa0 0000000000000000 0000000000000000 0000000000000008

[122349.906596] <0> 000000000000a380 000000000000a380 ffff88000184dbb0 000000000000a380

[122349.906603] Call Trace:

[122349.906609]  [<ffffffff8103877d>] find_busiest_group+0x4d/0x460

[122349.906614]  [<ffffffff8102acff>] ? resched_task+0x5f/0x70

[122349.906619]  [<ffffffff8103015e>] ? try_to_wake_up+0x27e/0x380

[122349.906623]  [<ffffffff81039294>] load_balance_newidle+0xa4/0x320

[122349.906629]  [<ffffffff814a1623>] thread_return+0x3cc/0x429

[122349.906637]  [<ffffffff81066607>] ? get_futex_value_locked+0x27/0x40

[122349.906641]  [<ffffffff81066d8d>] futex_wait_queue_me+0xcd/0x110

[122349.906647]  [<ffffffff81067878>] futex_wait+0x128/0x290

[122349.906655]  [<ffffffff81059d50>] ? autoremove_wake_function+0x0/0x40

[122349.906662]  [<ffffffff81066ee2>] ? futex_wake+0x112/0x130

[122349.906669]  [<ffffffff81069bb9>] do_futex+0xc9/0x1b0

[122349.906675]  [<ffffffff81069d16>] sys_futex+0x76/0x170

[122349.906683]  [<ffffffff810edee5>] ? sys_write+0x75/0x80

[122349.906690]  [<ffffffff81009ba8>] system_call_fastpath+0x16/0x1b

[122349.906694]  [<ffffffff81009b40>] ? system_call+0x0/0x52

[122349.906697] Code: 06 89 85 50 ff ff ff c7 85 54 ff ff ff 01 00 00 00 e9 cf fd ff ff 90 48 8b 95 70 ff ff ff 48 8b 45 a8 8b 72 08 48 c1 e0 0a 31 d2 <48> f7 f6 48 8b 75 b0 48 89 45 a0 31 c0 48 85 f6 74 0c 48 8b 45 

[122349.906747] RIP  [<ffffffff8102ceb4>] update_sd_lb_stats+0x3a4/0x4e0

[122349.906754]  RSP <ffff8804421db9f8>

[122349.906761] ---[ end trace e585f6ac1fc4d704 ]---