Server panics at kmem_cache_alloc while allocating slab memory due to unsigned kernel module fileaccess_mod

Issue

• System crashes with following messages in the kernel ring buffer

FILEACCESS_ERROR   : Failed to create slab memory for lru cache record
BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
IP: [<ffffffff81181176>] kmem_cache_alloc+0x76/0x190
PGD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 1 
Modules linked in: fileaccess_mod(+)(U) iptable_filter ip_tables nfs lockd fscache auth_rpcgss nfs_acl sunrpc cpufreq_ondemand freq_table pcc_cpufreq uinput power_meter acpi
_ipmi ipmi_si ipmi_msghandler microcode iTCO_wdt iTCO_vendor_support hpilo hpwdt sg serio_raw lpc_ich mfd_core ioatdma dca  dm_log dm_mod [last unloaded: fileaccess_mod]

Pid: 29052, comm: OAS Br WatchDog Not tainted 2.6.32-696.18.7.el6.x86_64 #1 HP ProLiant BL460c Gen8
RIP: 0010:[<ffffffff81181176>]  [<ffffffff81181176>] kmem_cache_alloc+0x76/0x190
Stack:
 ffff8817d196be78 ffffffff81131610 0000000000010000 0000000000000000
<d> 00000000ffffffff ffffffff811315f0 ffff8817d196be18 ffffffff81131625
<d> ffff8817d196be68 ffffffff81131b03 0000000000000008 ffff881026588c40
Call Trace:
 [<ffffffff81131610>] ? mempool_alloc_slab+0x0/0x20
 [<ffffffff811315f0>] ? mempool_free_slab+0x0/0x20
 [<ffffffff81131625>] mempool_alloc_slab+0x15/0x20
 [<ffffffff81131b03>] mempool_create_node+0xc3/0x120
 [<ffffffff81131b74>] mempool_create+0x14/0x20
 [<ffffffff81131b74>] mempool_create+0x14/0x20
 [<ffffffffa044a4c0>] scanCache_init+0xd0/0x190 [fileaccess_mod]
 [<ffffffffa005a000>] ? initFileAccess+0x0/0xd1 [fileaccess_mod]
 [<ffffffffa0444b83>] hook_init+0x13/0x1e0 [fileaccess_mod]
 [<ffffffffa005a000>] ? initFileAccess+0x0/0xd1 [fileaccess_mod]
 [<ffffffffa005a072>] initFileAccess+0x72/0xd1 [fileaccess_mod]
 [<ffffffffa005a000>] ? initFileAccess+0x0/0xd1 [fileaccess_mod]
 [<ffffffff810020d0>] do_one_initcall+0xc0/0x280
 [<ffffffff810c8d61>] sys_init_module+0xe1/0x250
 [<ffffffff815566d6>] system_call_fastpath+0x16/0x1b
 [<ffffffff8155656a>] ? system_call_after_swapgs+0xca/0x220
Code: 00 65 48 8b 04 25 00 fc 00 00 f6 40 17 10 0f 85 93 00 00 00 f6 80 18 0a 00 00 04 0f 85 86 00 00 00 65 8b 04 25 38 15 01 00 48 98 <49> 8b 44 c5 00 8b 18 85 db 0f 84 d7 00 00 00 8b 10 c7 40 0c 01 
RIP  [<ffffffff81181176>] kmem_cache_alloc+0x76/0x190
 RSP <ffff8817d196bdd8>
CR2: 0000000000000008