STack trace:

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa07c3cc6>] lov_ap_refresh_count+0x16/0x60 [lov]
PGD c0bbc4067 PUD c0b402067 PMD 0
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/pci0000:00/0000:00:0b.0/0000:02:00.0/0000:03:08.0/0000:04:00.1/irq
CPU 0
Modules linked in: mgc(U) lustre(U) lov(U) mdc(U) lquota(U) osc(U) ptlrpc(U) autofs4 ipmi_devintf ipmi_si ipmi_msghandler sunrpc bonding ib_ucm(U) rdma_ucm(U) ib_ipoib(U) ib_uverbs(U) ib_umad(U) iw_nes(U) libcrc32c iw_cxgb3(U) cxgb3(U) ib_qib(U) mlx4_ib(U) mlx4_en(U) mlx4_core(U) ib_mthca(U) ko2iblnd(U) rdma_cm(U) ib_cm(U) iw_cm(U) ib_sa(U) ib_mad(U) ib_core(U) ib_addr(U) ipv6 obdclass(U) lnet(U) lvfs(U) libcfs(U) dm_mirror dm_region_hash dm_log xpmem(U) xp gru xvma(U) numatools(U) sr_mod cdrom ixgbe mdio sg igb dca microcode serio_raw ghes hed k10temp hwmon i2c_piix4 i2c_core shpchp ext3 jbd mbcache sd_mod crc_t10dif usb_storage mptsas mptscsih mptbase scsi_transport_sas pata_acpi ata_generic pata_atiixp ahci dm_mod [last unloaded: ipmi_msghandler]

Modules linked in: mgc(U) lustre(U) lov(U) mdc(U) lquota(U) osc(U) ptlrpc(U) autofs4 ipmi_devintf ipmi_si ipmi_msghandler sunrpc bonding ib_ucm(U) rdma_ucm(U) ib_ipoib(U) ib_uverbs(U) ib_umad(U) iw_nes(U) libcrc32c iw_cxgb3(U) cxgb3(U) ib_qib(U) mlx4_ib(U) mlx4_en(U) mlx4_core(U) ib_mthca(U) ko2iblnd(U) rdma_cm(U) ib_cm(U) iw_cm(U) ib_sa(U) ib_mad(U) ib_core(U) ib_addr(U) ipv6 obdclass(U) lnet(U) lvfs(U) libcfs(U) dm_mirror dm_region_hash dm_log xpmem(U) xp gru xvma(U) numatools(U) sr_mod cdrom ixgbe mdio sg igb dca microcode serio_raw ghes hed k10temp hwmon i2c_piix4 i2c_core shpchp ext3 jbd mbcache sd_mod crc_t10dif usb_storage mptsas mptscsih mptbase scsi_transport_sas pata_acpi ata_generic pata_atiixp ahci dm_mod [last unloaded: ipmi_msghandler]
Pid: 20417, comm: flush-lustre-1 Not tainted 2.6.32-131.0.15.el6.x86_64 #1 C2108-G9
RIP: 0010:[<ffffffffa07c3cc6>]  [<ffffffffa07c3cc6>] lov_ap_refresh_count+0x16/0x60 [lov]
RSP: 0018:ffff880400ad1680  EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8803ebe15230 RCX: ffff8803e9668360
RDX: ffff8803e9668360 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff880400ad1690 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffa0806ee0 R11: 0000000000000003 R12: ffff8803e9668348
R13: 0000000000000000 R14: ffff8803e9668350 R15: ffff8803fa7c6ad0
FS:  00007fffe3fff700(0000) GS:ffff880028200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000c0b955000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process flush-lustre-1 (pid: 20417, threadinfo ffff880400ad0000, task ffff8803fe75a040)
Stack:
 ffff8803ebe15230 ffff8803e9668348 ffff880400ad17e0 ffffffffa074feb9
<0> ffff880400ad17a8 0000000000000000 0000000000000000 0000000000000000
<0> 0000000000000000 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffffa074feb9>] osc_send_oap_rpc+0x3a9/0x1580 [osc]
 [<ffffffff8104fc48>] ? update_curr+0xf8/0x1e0
 [<ffffffffa0751121>] osc_check_rpcs+0x91/0x3d0 [osc]
 [<ffffffff8100bc8e>] ? apic_timer_interrupt+0xe/0x20
 [<ffffffffa0745e03>] ? on_list+0x43/0x50 [osc]
 [<ffffffffa0751545>] osc_set_async_flags+0xe5/0x5d0 [osc]
 [<ffffffffa0660b23>] ? ldlm_resource_putref_internal+0xb3/0x4c0 [ptlrpc]
 [<ffffffffa085a241>] ? llap_from_page_with_lockh.clone.8+0x2a1/0x1120 [lustre]
 [<ffffffffa06612f0>] ? ldlm_resource_putref+0x10/0x20 [ptlrpc]
 [<ffffffffa07c6273>] lov_set_async_flags+0x133/0x460 [lov]
 [<ffffffff81122879>] ? test_set_page_writeback+0xe9/0x1a0
 [<ffffffffa085b2b4>] ll_writepage+0x1f4/0x6a0 [lustre]
 [<ffffffff8110cee0>] ? find_get_pages_tag+0x40/0x120
 [<ffffffffa0876d6e>] ll_writepage_26+0xe/0x10 [lustre]
 [<ffffffff81120e67>] __writepage+0x17/0x40
 [<ffffffff811221f9>] write_cache_pages+0x1c9/0x4a0
 [<ffffffffa0849bc2>] ? ll_clear_inode+0x2d2/0xbf0 [lustre]
 [<ffffffff81120e50>] ? __writepage+0x0/0x40
 [<ffffffffa0842ed0>] ? ll_delete_inode+0x0/0x160 [lustre]
 [<ffffffffa020c56e>] ? cfs_mem_cache_free+0xe/0x10 [libcfs]
 [<ffffffffa0878967>] ? ll_destroy_inode+0x67/0xf0 [lustre]
 [<ffffffffa0842ed0>] ? ll_delete_inode+0x0/0x160 [lustre]
 [<ffffffff811af00e>] ? __fsnotify_inode_delete+0xe/0x10
 [<ffffffff8118c66a>] ? __destroy_inode+0x2a/0xa0
 [<ffffffff811224f4>] generic_writepages+0x24/0x30
 [<ffffffff81122521>] do_writepages+0x21/0x40
 [<ffffffff8119bbbd>] writeback_single_inode+0xdd/0x2c0
 [<ffffffff8119bfbe>] writeback_sb_inodes+0xce/0x180
 [<ffffffff8119c11b>] writeback_inodes_wb+0xab/0x1b0
 [<ffffffff8119c4bb>] wb_writeback+0x29b/0x3f0
 [<ffffffff814db337>] ? thread_return+0x4e/0x777
 [<ffffffff8107a202>] ? del_timer_sync+0x22/0x30
 [<ffffffff8119c7a9>] wb_do_writeback+0x199/0x240
 [<ffffffff8119c8b3>] bdi_writeback_task+0x63/0x1b0
 [<ffffffff8108e027>] ? bit_waitqueue+0x17/0xd0
 [<ffffffff81130b90>] ? bdi_start_fn+0x0/0x100
 [<ffffffff81130c16>] bdi_start_fn+0x86/0x100
 [<ffffffff81130b90>] ? bdi_start_fn+0x0/0x100
 [<ffffffff8108ddf6>] kthread+0x96/0xa0
 [<ffffffff8100c1ca>] child_rip+0xa/0x20
 [<ffffffff8108dd60>] ? kthread+0x0/0xa0
 [<ffffffff8100c1c0>] ? child_rip+0x0/0x20
Code: 80 a0 e8 9e 09 a5 ff eb a6 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 83 ec 10 48 89 1c 24 4c 89 64 24 08 0f 1f 44 00 00 <81> 3f 08 20 00 00 48 89 fb 41 89 f4 75 19 48 8b 43 28 48 8b 7b
RIP  [<ffffffffa07c3cc6>] lov_ap_refresh_count+0x16/0x60 [lov]
 RSP <ffff880400ad1680>
CR2: 0000000000000000