Clustered node panicked in xfs_da_do_buf()

Issue

• Clustered node panicked with the following message:

<1>BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
<1>IP: [<ffffffffa051a110>] xfs_da_do_buf+0x620/0x770 [xfs]
<4>PGD 0 
<4>Oops: 0000 [#1] SMP 
<4>last sysfs file: /sys/devices/pci0000:00/0000:00:05.0/0000:11:00.1/host4/rport-4:0-1/target4:0:1/4:0:1:6/state
<4>CPU 67 
<4>Modules linked in: dm_log_userspace nfsd nfs_acl auth_rpcgss xfs exportfs dlm configfs mptctl mptbase lockd sunrpc bonding 8021q garp stp llc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrac
k ip6table_filter ip6_tables ipv6 dm_round_robin dm_multipath ses enclosure power_meter be2net qla2xxx scsi_transport_fc scsi_tgt netxen_nic serio_raw iTCO_wdt iTCO_vendor_support hpilo hpwdt sg i7core_edac edac_core shpchp ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif pata_acpi ata_generic ata_piix hpsa radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
<4>
<4>Pid: 158750, comm: nfsd Not tainted 2.6.32-358.2.1.el6.x86_64 #1 HP ProLiant DL980 G7
<4>RIP: 0010:[<ffffffffa051a110>]  [<ffffffffa051a110>] xfs_da_do_buf+0x620/0x770 [xfs]
<4>RSP: 0018:ffff88089e2ff820  EFLAGS: 00010246
<4>RAX: 0000000000000000 RBX: ffff8808df03e000 RCX: 0000000000000002
<4>RDX: 0000000000000000 RSI: ffff888fbcbd9c50 RDI: 0000000000000001
<4>RBP: ffff88089e2ff900 R08: 0000000000000000 R09: 0000000000000004
<4>R10: ffffffff81641c40 R11: ffff8810669cee0f R12: 0000000000000000
<4>R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
<4>FS:  0000000000000000(0000) GS:ffff890038820000(0000) knlGS:0000000000000000
<4>CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
<4>CR2: 0000000000000008 CR3: 00000007ec997000 CR4: 00000000000007e0
<4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
<4>Process nfsd (pid: 158750, threadinfo ffff88089e2fe000, task ffff880a62b6b500)
<4>Stack:
<4> ffff88089e2ff8c0 ffffffff8109c99f ffff88089e2ff840 ffffffff810913cf
<4><d> ffff88089e2ff8b0 ffff8900591166c0 ffff88089e2ff880 0000000000000001
<4><d> ffff88089e2ff890 ffff88089e2ff9d0 000000009e2ff8f8 0000000000000000
<4>Call Trace:
<4> [<ffffffff8109c99f>] ? up+0x2f/0x50
<4> [<ffffffff810913cf>] ? queue_work+0x1f/0x30
<4> [<ffffffffa0546f08>] ? xfs_trans_brelse+0xe8/0x130 [xfs]
<4> [<ffffffffa051a2da>] xfs_da_read_buf+0x2a/0x30 [xfs]
<4> [<ffffffffa0520c56>] ? xfs_dir2_leaf_getdents+0x266/0x780 [xfs]
<4> [<ffffffffa0520c56>] xfs_dir2_leaf_getdents+0x266/0x780 [xfs]
<4> [<ffffffffa0040560>] ? filldir_one+0x0/0x60 [exportfs]
<4> [<ffffffffa051d459>] xfs_readdir+0xf9/0x130 [xfs]
<4> [<ffffffffa0040560>] ? filldir_one+0x0/0x60 [exportfs]
<4> [<ffffffffa0552350>] ? xfs_dir_open+0x0/0x80 [xfs]
<4> [<ffffffffa0040560>] ? filldir_one+0x0/0x60 [exportfs]
<4> [<ffffffffa0552409>] xfs_file_readdir+0x39/0x50 [xfs]
<4> [<ffffffff81196460>] vfs_readdir+0xc0/0xe0
<4> [<ffffffffa0040214>] exportfs_get_name+0x124/0x160 [exportfs]
<4> [<ffffffffa00403e9>] reconnect_path+0x199/0x310 [exportfs]
<4> [<ffffffffa00407aa>] exportfs_decode_fh+0xea/0x2bc [exportfs]
<4> [<ffffffffa05dc810>] ? nfsd_acceptable+0x0/0x120 [nfsd]
<4> [<ffffffffa043e600>] ? cache_check+0x60/0x360 [sunrpc]
<4> [<ffffffffa05e2702>] ? exp_find_key+0x62/0xb0 [nfsd]
<4> [<ffffffffa05dcd0a>] fh_verify+0x32a/0x640 [nfsd]
<4> [<ffffffffa05e79ac>] nfsd3_proc_getattr+0x6c/0xe0 [nfsd]
<4> [<ffffffffa05d943e>] nfsd_dispatch+0xfe/0x240 [nfsd]
<4> [<ffffffffa0434654>] svc_process_common+0x344/0x640 [sunrpc]
<4> [<ffffffff81063310>] ? default_wake_function+0x0/0x20
<4> [<ffffffffa0434c90>] svc_process+0x110/0x160 [sunrpc]
<4> [<ffffffffa05d9b62>] nfsd+0xc2/0x160 [nfsd]
<4> [<ffffffffa05d9aa0>] ? nfsd+0x0/0x160 [nfsd]
<4> [<ffffffff81096936>] kthread+0x96/0xa0
<4> [<ffffffff8100c0ca>] child_rip+0xa/0x20
<4> [<ffffffff810968a0>] ? kthread+0x0/0xa0
<4> [<ffffffff8100c0c0>] ? child_rip+0x0/0x20
<4>Code: 44 00 00 45 31 e4 48 83 7d c0 00 0f 84 6a fd ff ff 48 8b 55 18 48 8d 75 c0 bf 01 00 00 00 e8 98 f3 ff ff 49 89 c4 e9 50 fd ff ff <4d> 8b 6c 24 08 41 0f b7 45 08 41 8b 55 00 0f ca 66 c1 c0 08 0f 
<1>RIP  [<ffffffffa051a110>] xfs_da_do_buf+0x620/0x770 [xfs]
<4> RSP <ffff88089e2ff820>
<4>CR2: 0000000000000008