Issue

• System was crashed with the below error messages.

Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP: 
 [<ffffffff88be084a>] :vxdmp:gen_pr_select_path+0x121/0x1c0
PGD 4028d85067 PUD 1fd9511067 PMD 0 
Oops: 0000 [1] SMP 
last sysfs file: /class/fc_remote_ports/rport-6:0-1/roles
CPU 16 
Modules linked in: nfs nfs_acl vxfen(PU) gab(PU) llt(PU) mptctl mptbase vxodm(PFU) autofs4 dmpaa(PU) vxspec(PFU) vxio(PFU) vxdmp(PU) lockd sunrpc bonding ipv6 xfrm_nalgo crypto_api ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i(U) cnic(U) uio cxgb3i libcxgbi cxgb3 libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi vxportal(PFU) fdd(PFU) vxfs(PU) exportfs dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec i2c_core dell_wmi wmi button battery asus_acpi acpi_memhotplug ac parport_pc lp parport sg joydev qla2xxx tpm_tis shpchp be2iscsi(U) tpm i7core_edac be2net(U) scsi_transport_fc edac_mc tpm_bios hpilo serio_raw pcspkr 8021q bnx2(U) dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod usb_storage cciss(U) ext3 jbd uhci_hcd ohci_hcd ehci_hcd hpvsa(PU) sd_mod scsi_mod
Pid: 10786, comm: testproc Tainted: PF    ---- 2.6.18-308.1.1.el5 #1
RIP: 0010:[<ffffffff88be084a>]  [<ffffffff88be084a>] :vxdmp:gen_pr_select_path+0x121/0x1c0
RSP: 0018:ffff811fda497398  EFLAGS: 00010007
RAX: 0000000030200305 RBX: ffff811ff608f3c0 RCX: ffffffffa3691624
RDX: 00000000bcf652b7 RSI: 0000000000000005 RDI: 00000000a3691624
RBP: 0000000000000000 R08: 0000000000000020 R09: 0000000000000004
R10: 0000000000000000 R11: 0000000030200305 R12: ffff812039701180
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000004
FS:  00002aaaaafe3530(0000) GS:ffff81403feeef40(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000403ae4f000 CR4: 00000000000006a0
Process testproc (pid: 10786, threadinfo ffff811fda496000, task ffff811fdeedf7e0)
Stack:  ffff811aa5703000 ffff811ff608f3c0 000000000000ffff 0000000000000010
 0000000000000120 ffffffff88bd96d9 ffff811aa5703000 ffff811ff608f3c0
 000000000000ffff 0000000000000010 0000000000000120 ffffffff88bdb6b3
Call Trace:
 [<ffffffff88bd96d9>] :vxdmp:dmp_select_path+0x58/0x13b
 [<ffffffff88bdb6b3>] :vxdmp:gendmpstrategy+0x1c1/0x31a
 [<ffffffff8001c31e>] generic_make_request+0x211/0x228
 [<ffffffff88c52d4a>] :vxio:voldiskiostart+0x3bf/0x3d0
 [<ffffffff88c8c157>] :vxio:vol_subdisksio_start+0x420/0x431
 [<ffffffff88c62a0e>] :vxio:volkcontext_process+0xd3/0x136
 [<ffffffff88c641bd>] :vxio:volkiostart+0x8d8/0x9c3
 [<ffffffff88c2b0a4>] :vxio:vxvm_process_request_queue+0x137/0x16f
 [<ffffffff88c2b1ae>] :vxio:vxvm_unplug_fn+0x8d/0xa7
 [<ffffffff88877124>] :vxfs:vx_dio_physio+0xac7/0xdca
 [<ffffffff8879eeb9>] :vxfs:vx_dio_rdwri+0x402/0x602
 [<ffffffff8889b526>] :vxfs:vx_write_direct+0x322/0x555
 [<ffffffff8889cf14>] :vxfs:vx_write1+0x8a8/0xd63
 [<ffffffff8003baf4>] remove_wait_queue+0x1c/0x2c
 [<ffffffff8889e21a>] :vxfs:vx_write_common_slow+0x3ff/0xa1e
 [<ffffffff801563dc>] __next_cpu+0x19/0x28
 [<ffffffff8889ec4b>] :vxfs:vx_write_common+0x328/0x396
 [<ffffffff80130619>] inode_has_perm+0x56/0x63
 [<ffffffff88848df9>] :vxfs:vx_vop_write+0x14/0x19
 [<ffffffff8884c85a>] :vxfs:vx_write+0x21e/0x277
 [<ffffffff80016b3d>] vfs_write+0xce/0x174
 [<ffffffff80017406>] sys_write+0x45/0x6e
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0


Code: 48 23 45 08 48 39 f0 75 27 48 ff c1 48 8b 85 e8 01 00 00 48 
RIP  [<ffffffff88be084a>] :vxdmp:gen_pr_select_path+0x121/0x1c0
 RSP <ffff811fda497398>