System crashed with RIP _read_lock+0x0/0xc.

Issue

• System crashed with following panic message:

Unable to handle kernel NULL pointer dereference at 0000000000000028 RIP: 
 [<ffffffff80064b4a>] _read_lock+0x0/0xc
PGD c0e91a067 PUD 0 
Oops: 0002 [1] SMP 
last sysfs file: /devices/pci0000:00/0000:00:00.0/irq
CPU 1 
Modules linked in: linuxshield(U) lshook(U) nfs lockd nfs_acl sunrpc be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb3i libcxgbi cxgb3 libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi dm_mirror 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 bnx2x tpm_tis 8021q tpm tpm_bios i7core_edac mdio serio_raw edac_mc hpilo sg pcspkr dm_raid45 dm_message dm_region_hash dm_log dm_mod dm_mem_cache qla2300(U) cciss shpchp qla2400(U) qla2xxx(FU) sd_mod scsi_mod intermodule(U) ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 4739, comm: rpciod/1 Tainted: GF    --------------------    2.6.18-348.3.1.el5 #1
RIP: 0010:[<ffffffff80064b4a>]  [<ffffffff80064b4a>] _read_lock+0x0/0xc
..
Process rpciod/1 (pid: 4739, threadinfo ffff81061761e000, task ffff810c1b799100)
..
Call Trace:
 [<ffffffff8877c4fa>] :lshook:fileOpenHook+0x92/0x2a0
 [<ffffffff887428c1>] :nfs:nfs3_xdr_commitres+0x7a/0xa5
 [<ffffffff886dee4a>] :sunrpc:rpc_async_schedule+0x0/0x5
 [<ffffffff886dead4>] :sunrpc:rpc_exit_task+0x25/0x66
 [<ffffffff886dec07>] :sunrpc:__rpc_execute+0x9c/0x2df
 [<ffffffff8004d8b6>] run_workqueue+0x9e/0xfb
 [<ffffffff8004a0ff>] worker_thread+0x0/0x122
 [<ffffffff800a3a10>] keventd_create_kthread+0x0/0xc4
 [<ffffffff8004a1ef>] worker_thread+0xf0/0x122
 [<ffffffff8008f3ad>] default_wake_function+0x0/0xe
 [<ffffffff800a3a10>] keventd_create_kthread+0x0/0xc4
 [<ffffffff80032c29>] kthread+0xfe/0x132
 [<ffffffff8005dfc1>] child_rip+0xa/0x11
 [<ffffffff800a3a10>] keventd_create_kthread+0x0/0xc4
 [<ffffffff80032b2b>] kthread+0x0/0x132
 [<ffffffff8005dfb7>] child_rip+0x0/0x11