Kernel panic due to null pointer dereference in the function asmStrategyB()

Issue

• System crashes with following messages in the kernel ring buffer :

OKSK-00008: Cluster Membership Change starting - Incarnation 96.
OKSK-00023: Cluster membership node list:
OKSK-00024:   Node 1 (Interconnect address: 169.254.40.26)
OKSK-00025: Cluster membership node count: 1, Local Node Number: 1.
ADVMK-0013: Cluster reconfiguration started.
ADVMK-0014: Cluster reconfiguration completed.
ADVMK-0014: Cluster reconfiguration completed.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: [<ffffffffa06044e1>] asmStrategyB+0x10/0x103 [oracleadvm]
Kernel PGD 8000001026882067 PUD 39c8d6067 PMD 0 
User   PGD 1026882067 PUD 39c8d6067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/virtual/block/ofsctl/range
CPU 8 
Modules linked in: oracleacfs(P)(U) oracleadvm(P)(U) oracleoks(P)(U) vsock(U) vmci(U) autofs4 nfs lockd fscache auth_rpcgss nfs_acl sunrpc ib_ipoib rdma_ucm i
b_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 vhost_net macvtap macvlan tun vmware_balloon sg i2c_piix4 shpchp ext4 jbd2 mbcac
he sr_mod cdrom sd_mod crc_t10dif ahci vmxnet3 vmw_pvscsi pata_acpi ata_generic ata_piix vmwgfx ttm drm_kms_helper drm i2c_core dm_mirror dm_region_hash dm_lo
g dm_mod [last unloaded: oracleoks]

Pid: 24218, comm: oks_rbld Tainted: P           -- ------------    2.6.32-754.10.1.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference 
Platform
RIP: 0010:[<ffffffffa06044e1>]  [<ffffffffa06044e1>] asmStrategyB+0x10/0x103 [oracleadvm]
RSP: 0018:ffff8800ad5a7920  EFLAGS: 00010206
RAX: 00000000000038d4 RBX: ffff880394678400 RCX: 0000000000000000
RDX: ffff880394678400 RSI: ffff8810219bf7c0 RDI: 0000000000000000
RBP: ffff8800ad5a7940 R08: 0000000000000246 R09: 0000000000000000
R10: ffff880394678400 R11: 0000000000000280 R12: 00000000000038d4
R13: 0000000000000000 R14: ffff880aba8c8880 R15: ffff8810219bf7c0
FS:  00007f25d343c280(0000) GS:ffff880062600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000020 CR3: 00000010271a2000 CR4: 00000000001607e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Process oks_rbld (pid: 24218, threadinfo ffff8800ad5a4000, task ffff8802da550ab0)
Stack:
 ffff880394678400 00000000000038d4 0000000000000000 ffff880aba8c8880
<d> ffff8800ad5a79a0 ffffffffa060470f ffff8800ad5a79b8 000000e928c425f0
<d> ffff8800ad5a7970 ffffffff81135da5 ffff8800ad5a7a00 ffff8800b16b5800
Call Trace:
 [<ffffffffa060470f>] asmIoctl_int.isra.9+0x13b/0x263 [oracleadvm]
 [<ffffffff81135da5>] ? mempool_alloc_slab+0x15/0x20
 [<ffffffffa060485f>] asmIoctl+0x13/0x15 [oracleadvm]
 [<ffffffff8129002a>] __blkdev_driver_ioctl+0x2a/0x90
 [<ffffffff812904fd>] blkdev_ioctl+0x1ed/0x6e0
 [<ffffffffa052f9a2>] ? KsMalloc+0xb2/0x260 [oracleoks]
 [<ffffffff811de82d>] ioctl_by_bdev+0x3d/0x50
 [<ffffffffa07e31b0>] LinuxRWDisk+0x7b0/0x1730 [oracleacfs]
 [<ffffffffa06e29cc>] ? OfsFreeMemory+0x5c/0xa0 [oracleacfs]
 [<ffffffffa07b4a13>] OfsRecoveryGetLocalDirBlock+0x43/0xf0 [oracleacfs]
 [<ffffffffa07b761c>] OfsGetRecoveryLockId+0x28c/0x340 [oracleacfs]
 [<ffffffffa07b7940>] OfsCompleteRecoverySetup+0x270/0x670 [oracleacfs]
 [<ffffffffa056546b>] kcss_rbld_do_step+0x29b/0x660 [oracleoks]
 [<ffffffffa0555772>] odlm_process_request+0x562/0x1400 [oracleoks]
 [<ffffffffa053dc35>] ? DLM_LOG+0x45/0x50 [oracleoks]
 [<ffffffffa055b5ca>] odlm_comm_bcast+0x30a/0x920 [oracleoks]
 [<ffffffffa05644d8>] kcss_rbld_th+0x998/0xfd0 [oracleoks]
 [<ffffffffa0563b40>] ? kcss_rbld_th+0x0/0xfd0 [oracleoks]
 [<ffffffffa0563b40>] ? kcss_rbld_th+0x0/0xfd0 [oracleoks]
 [<ffffffffa0530ac3>] KsKthreadRun+0x73/0x90 [oracleoks]
 [<ffffffff815657d0>] child_rip+0x20/0x30
 [<ffffffffa0563b40>] ? kcss_rbld_th+0x0/0xfd0 [oracleoks]
 [<ffffffffa0530a50>] ? KsKthreadRun+0x0/0x90 [oracleoks]
 [<ffffffff815657b0>] ? child_rip+0x0/0x30
Code: 0f 1f 44 00 00 65 48 8b 14 25 08 fc 00 00 48 8d 45 fc c9 29 d0 05 70 3f 00 00 c3 55 48 89 e5 41 56 41 55 41 54 53 0f 1f 44 00 00 <4c> 8b 77 20 48 89 fb 49 89 f4 49 89 d5 41 f6 c6 20 74 1e c7 47 
RIP  [<ffffffffa06044e1>] asmStrategyB+0x10/0x103 [oracleadvm]
 RSP <ffff8800ad5a7920>
CR2: 0000000000000020