BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa07a32e3>] ll_readahead+0x43/0x1d20 [lustre]
PGD 8dfedf18067 PUD 8dfeee4d067 PMD 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/system/node/node22/meminfo
CPU 624
Modules linked in: mgc lustre lov mdc lquota osc ko2iblnd ptlrpc obdclass lnet lvfs libcfs autofs4 sunrpc bonding ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_addr ipv6 ib_sa vfat fat dm_mirror dm_region_hash dm_log dm_mod uv_mmtimer numatools hwperf xpmem xp vhost_net macvtap macvlan tun kvm_intel kvm uinput microcode ghes hed mlx4_ib ib_mad ib_core mlx4_en mlx4_core i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support sg ioatdma igb dca ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif usb_storage mptsas mptscsih mptbase scsi_transport_sas gru xvma [last unloaded: scsi_wait_scan]

Modules linked in: mgc lustre lov mdc lquota osc ko2iblnd ptlrpc obdclass lnet lvfs libcfs autofs4 sunrpc bonding ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_addr ipv6 ib_sa vfat fat dm_mirror dm_region_hash dm_log dm_mod uv_mmtimer numatools hwperf xpmem xp vhost_net macvtap macvlan tun kvm_intel kvm uinput microcode ghes hed mlx4_ib ib_mad ib_core mlx4_en mlx4_core i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support sg ioatdma igb dca ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif usb_storage mptsas mptscsih mptbase scsi_transport_sas gru xvma [last unloaded: scsi_wait_scan]
Pid: 45974, comm: sge_execd Tainted: G   M       ----------------   2.6.32-131.0.15.el6.x86_64 #3 Stoutland Platform
RIP: 0010:[<ffffffffa07a32e3>]  [<ffffffffa07a32e3>] ll_readahead+0x43/0x1d20 [lustre]
RSP: 0000:ffff914fef0cb838  EFLAGS: 00010246
RAX: ffff934fb54a0000 RBX: ffffea195dd22270 RCX: ffff924fef167e00
RDX: 0000000000000000 RSI: ffff934fef3b2e00 RDI: ffff905feaa5fa40
RBP: ffff914fef0cb998 R08: 0000000000000000 R09: 0000000000000001
R10: ffff905feda04f40 R11: ffff934fb54a0000 R12: ffff905feaa5fa40
R13: ffff905feaa5fa40 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fdda4460700(0000) GS:ffff91c038800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000004f53c0 CR3: 000008dfe5761000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process sge_execd (pid: 45974, threadinfo ffff914fef0ca000, task ffff914fec482b00)
Stack:
 ffff924ee9767448 ffff924fef167e00 0000000000000000 ffff934fb508ec00
<0> ffff905feda04f40 ffff905fee93cbc0 0000000000000001 ffff924ee9767380
<0> ffff914fef0cb8f8 ffffffffa070dc1f 0000000000000000 ffff934f00001000
Call Trace:
 [<ffffffffa070dc1f>] ? lov_queue_group_io+0x14f/0x490 [lov]
 [<ffffffffa07a02f1>] ? ll_issue_page_read+0x131/0x420 [lustre]
 [<ffffffff8100bc8e>] ? apic_timer_interrupt+0xe/0x20
 [<ffffffffa07a7ad2>] ll_readpage+0xdb2/0x1b50 [lustre]
 [<ffffffff8112e55e>] ? __inc_zone_page_state+0x2e/0x30
 [<ffffffff8110dd23>] filemap_fault+0x313/0x500
 [<ffffffffa07b4a3f>] ll_fault+0x36f/0xe40 [lustre]
 [<ffffffff8105dc32>] ? default_wake_function+0x12/0x20
 [<ffffffff8108e116>] ? autoremove_wake_function+0x16/0x40
 [<ffffffff8108e17b>] ? wake_bit_function+0x3b/0x50
 [<ffffffff8100bcee>] ? invalidate_interrupt1+0xe/0x20
 [<ffffffff81164627>] ? mem_cgroup_update_file_mapped+0x17/0x90
 [<ffffffff81136594>] __do_fault+0x54/0x510
 [<ffffffff81136b47>] handle_pte_fault+0xf7/0xb50
 [<ffffffff8105dc50>] ? wake_up_state+0x10/0x20
 [<ffffffff8109f900>] ? wake_futex+0x40/0x60
 [<ffffffff810a013e>] ? futex_wake+0x10e/0x120
 [<ffffffff81137778>] handle_mm_fault+0x1d8/0x2a0
 [<ffffffff81103146>] ? __perf_event_task_sched_out+0x36/0x50
 [<ffffffff810414e9>] __do_page_fault+0x139/0x480
 [<ffffffff810500b0>] ? __dequeue_entity+0x30/0x50
 [<ffffffff810097ac>] ? __switch_to+0x1ac/0x320
 [<ffffffff814d81b7>] ? thread_return+0x4e/0x777
 [<ffffffff81098920>] ? getnstimeofday+0x60/0xf0
 [<ffffffff814ddabe>] do_page_fault+0x3e/0xa0
 [<ffffffff814dae65>] page_fault+0x25/0x30
Code: 00 f6 05 44 45 c8 ff 01 49 89 fc 48 89 b5 60 ff ff ff 49 89 d7 48 89 8d 50 ff ff ff 74 0d 80 3d 23 45 c8 ff 00 0f 88 6d 04 00 00 <49> 8b 1f 4c 8b b3 f0 fe ff ff 4c 89 f7 e8 9b 09 f7 ff 48 8b 43
RIP  [<ffffffffa07a32e3>] ll_readahead+0x43/0x1d20 [lustre]
 RSP <ffff914fef0cb838>
CR2: 0000000000000000
.