Issue

• Kernel panic with following call traces.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000280
IP: [<ffffffffa08f4abc>] vx_real_drop_inode+0x6c/0x100 [vxfs]
PGD a895d94067 PUD bf39ae2067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/cpu73/cpufreq/scaling_setspeed
CPU 40 
Modules linked in: mptctl mptbase vxodm(P)(U) amf(P)(U) vxfen(P)(U) gab(P)(U) llt(P)(U) autofs4 nfs lockd fscache nfs_acl auth_rpcgss sunrpc dmpjbod(P)(U) dmpap(P)(U) dmpaa(P)(U) vxspec(P)(U) vxio(P)(U) vxdmp(P)(U) pcc_cpufreq bonding ipv6 vxportal(P)(U) fdd(P)(U) vxfs(P)(U) exportfs ext3 jbd emcpvlumd(P)(U) emcpxcrypt(P)(U) emcpdm(P)(U) emcpgpx(P)(U) emcpmpx(P)(U) emcp(P)(U) tg3 microcode serio_raw iTCO_wdt iTCO_vendor_support hpilo hpwdt i7core_edac edac_core sg power_meter netxen_nic shpchp ext4 mbcache jbd2 sd_mod crc_t10dif lpfc scsi_transport_fc scsi_tgt hpsa radeon ttm drm_kms_helper drm i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: emcpioc]

Pid: 19911, comm: flush-199:10003 Tainted: P           ----------------   2.6.32-220.34.2.el6.x86_64 #1 HP ProLiant DL580 G7
RIP: 0010:[<ffffffffa08f4abc>]  [<ffffffffa08f4abc>] vx_real_drop_inode+0x6c/0x100 [vxfs]
RSP: 0018:ffff88457ae17be0  EFLAGS: 00010246
RAX: 0000000000006c6a RBX: 0000000000000000 RCX: ffff88a75eded5c8
RDX: 0000000000006c6a RSI: ffffffff81fbf3c0 RDI: ffffffffa09b14d8
RBP: ffff88457ae17bf0 R08: 8040000000000000 R09: 58834afff795f008
R10: 0000000000000000 R11: 0000000000000000 R12: ffff883f2f994c00
R13: ffff88457ae17d20 R14: ffff88a75eded5a8 R15: ffff88f559e4c758
FS:  0000000000000000(0000) GS:ffff880161880000(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000280 CR3: 0000009929a51000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process flush-199:10003 (pid: 19911, threadinfo ffff88457ae16000, task ffff887fa27d14c0)
Stack:
 ffffffff81a8d020 ffff88a75eded5a8 ffff88457ae17c10 ffffffff811910e2
<0> ffff88a75eded5a8 ffff88f559e4c718 ffff88457ae17c70 ffffffff811a13e0
<0> ffff88f559e4c758 0000000000000000 ffff88bf5754c500 ffff88f559e4c768
Call Trace:
 [<ffffffff811910e2>] iput+0x62/0x70
 [<ffffffff811a13e0>] writeback_sb_inodes+0x100/0x180
 [<ffffffff811a150b>] writeback_inodes_wb+0xab/0x1b0
 [<ffffffff811a18ab>] wb_writeback+0x29b/0x3f0
 [<ffffffff814ede58>] ? thread_return+0x4e/0x766
 [<ffffffff8107cf92>] ? del_timer_sync+0x22/0x30
 [<ffffffff811a1b99>] wb_do_writeback+0x199/0x240
 [<ffffffff811a1ca3>] bdi_writeback_task+0x63/0x1b0
 [<ffffffff81090e27>] ? bit_waitqueue+0x17/0xd0
 [<ffffffff811353f0>] ? bdi_start_fn+0x0/0x100
 [<ffffffff81135476>] bdi_start_fn+0x86/0x100
 [<ffffffff811353f0>] ? bdi_start_fn+0x0/0x100
 [<ffffffff81090bf6>] kthread+0x96/0xa0
 [<ffffffff8100c14a>] child_rip+0xa/0x20
 [<ffffffff81090b60>] ? kthread+0x0/0xa0
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code: 89 47 28 48 c7 87 18 02 00 00 00 00 00 00 c7 87 64 02 00 00 00 00 00 00 48 c7 c7 d8 14 9b a0 e8 6b bc bf e0 48 8b 1d dc d2 0b 00 <48> 8b 83 80 02 00 00 48 89 05 ce d2 0b 00 48 c7 c0 d8 14 9b a0 
RIP  [<ffffffffa08f4abc>] vx_real_drop_inode+0x6c/0x100 [vxfs]
 RSP <ffff88457ae17be0>
CR2: 0000000000000280