Kernel panic due to unsigned kernel module "oracleacfs"

Issue

• Servers rebooted unexpectedly

• Kernel panic with following call traces :

  BUG: unable to handle kernel paging request at ffffc9002ee7b000
  IP: [<ffffffffa080c397>] OfsZeroDiskRange+0xd57/0xff0 [oracleacfs]
  PGD 207feb9067 PUD 207feba067 PMD d77c02067 PTE 0
  Oops: 0000 [#1] SMP 
  last sysfs file: /sys/devices/virtual/net/bond0.38/carrier
  CPU 0 
  Modules linked in: bridge lin_tape(U) nfsd exportfs oracleacfs(P)(U) oracleadvm(P)(U) oracleoks(P)(U) oracleasm(U) autofs4 nfs lockd fscache auth_rpcgss nfs_acl sunrpc acpi_cpufreq freq_table mperf bonding 8021q garp stp llc ipv6 vfat fat iTCO_wdt iTCO_vendor_support microcode cdc_ether usbnet mii i2c_i801 i2c_core lpc_ich mfd_core shpchp osst st ipmi_si ipmi_msghandler sg be2net ext4 jbd2 mbcache dm_round_robin sd_mod mpt2sas scsi_transport_sas raid_class wmi lpfc(U) scsi_transport_fc scsi_tgt crc_t10dif dm_multipath dm_mirror dm_region_hash dm_log dm_mod [last unloaded: oracleoks]
  Pid: 6263, comm: oracle Tainted: P        W  ---------------    2.6.32-504.16.2.el6.x86_64 #1 IBM Flex System x240 Compute Node -[873715X]-/00AE643
  RIP: 0010:[<ffffffffa080c397>]  [<ffffffffa080c397>] OfsZeroDiskRange+0xd57/0xff0 [oracleacfs]
  RSP: 0018:ffff8805417abc78  EFLAGS: 00010206
  RAX: 000000000003f000 RBX: ffff880b1b4098c0 RCX: ffffc9002ee3c000
  RDX: ffffc9002ee3c000 RSI: 0000000000000001 RDI: ffff8820498a65e0
  RBP: ffff8805417abd18 R08: 00000000051fd798 R09: 000000000fd00037
  R10: 0000000000000068 R11: 000000000000089e R12: 0000000000000440
  R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
  FS:  00007f848f03d700(0000) GS:ffff88004c200000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  CR2: ffffc9002ee7b000 CR3: 0000000a28eaf000 CR4: 00000000001407f0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Process oracle (pid: 6263, threadinfo ffff8805417aa000, task ffff8802d348d520)
  Stack:
  ffff880d7b33a460 000000000bdc4000 0000000000004000 0000000000004000
  <d> ffff88031a532aa0 001000000bdc4000 000000000bdc0000 000000000bdc4000
  <d> 0000000000004000 ffffc9002eba3000 ffff8805417abd18 000000025c000000
  Call Trace:
  [<ffffffffa08ae817>] ofs_setattr+0x1c37/0x2490 [oracleacfs]
  [<ffffffff8122e9ef>] ? security_inode_permission+0x1f/0x30
  [<ffffffff811ad398>] notify_change+0x168/0x340
  [<ffffffff8118c3e4>] do_truncate+0x64/0xa0
  [<ffffffff8118c790>] sys_ftruncate+0x120/0x130
  [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
  Code: 0a 10 48 39 c2 0f 85 cf fe ff ff 8b 43 24 48 c7 43 28 00 00 00 00 83 c0 01 4d 85 ed 89 43 24 75 76 48 8b 55 c0 89 c0 48 c1 e0 05 <48> 8b 04 10 48 89 43 18 e9 a2 fe ff ff 48 8d 47 30 66 ff 00 66 
  RIP  [<ffffffffa080c397>] OfsZeroDiskRange+0xd57/0xff0 [oracleacfs]
  RSP <ffff8805417abc78>
  CR2: ffffc9002ee7b000
  

  OR

  BUG: unable to handle kernel paging request at 0000000100000029  
  IP: [<ffffffffa0be37d0>] ofs_fcbtable_lookup+0x170/0xb30 [oracleacfs]
  Kernel PGD 80000024ab3f7067 PUD 0 
  User   PGD 24ab3f7067 PUD 0 
  Oops: 0000 [#1] SMP 
  last sysfs file: /sys/devices/virtual/net/bond0.395/carrier
  CPU 8 
  Modules linked in: falcon_lsm_serviceable(P)(U) falcon_nf_netcontain(P)(U) falcon_kal(U) falcon_lsm_pinned_12803(U) falcon_lsm_pinned_12704(U) falcon_lsm_pinned_12606(U) ip6table_filter ip6_tables iptable_filter ip_tables tcp_diag inet_diag falcon_lsm_pinned_12504(U) rds oracleacfs(P)(U) oracleadvm(P)(U) oracleoks(P)(U) lin_tape(U) pfo(U) nfsd exportfs oracleasm autofs4 bmhook(U) tmhook(U) dsa_filter(P)(U) dsa_filter_hook(U) nfs lockd fscache auth_rpcgss nfs_acl sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf 8021q garp stp llc falcon_lsm_pinned_12304(U) bonding ipv6 vfat fat iTCO_wdt iTCO_vendor_support microcode cdc_ether usbnet mii i2c_i801 i2c_core lpc_ich mfd_core shpchp osst st ipmi_si ipmi_msghandler sg ext4 jbd2 mbcache dm_round_robin sd_mod mpt2sas scsi_transport_sas raid_class lpfc(U) scsi_transport_fc scsi_tgt crc_t10dif be2net wmi dm_multipath dm_mirror dm_region_hash dm_log dm_mod [last unloaded: falcon_kal]
  Pid: 3135, comm: wscansw Tainted: P        W  -- ------------    2.6.32-754.41.2.el6.x86_64 #1 IBM Flex System x240 Compute Node -[873715X]-/00AE643
  RIP: 0010:[<ffffffffa0be37d0>]  [<ffffffffa0be37d0>] ofs_fcbtable_lookup+0x170/0xb30 [oracleacfs]
  RSP: 0018:ffff88138fd3b7e8  EFLAGS: 00010202
  RAX: 0000000000000072 RBX: 0000000100000001 RCX: 0000000000000000
  RDX: 00000000000001cc RSI: 0000000000000001 RDI: ffff88138fd3b9cc
  RBP: ffff88138fd3b8d8 R08: 0000000000003447 R09: 0000000000000011
  R10: 0000000000000000 R11: 0000000000000008 R12: ffff8828483c0000
  R13: 0000000000000001 R14: 00000000005318be R15: 000000000051f7ce
  FS:  00007f079600d720(0000) GS:ffff8801b9a00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000100000029 CR3: 000000280cf00000 CR4: 00000000001607e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Process wscansw (pid: 3135, threadinfo ffff88138fd38000, task ffff881b74bdd520)
  Stack:
  0000000000000000 0000000000000000 ffff881300000000 0000000000000000
  <d> ffff88138fd3b8b0 0000000000000202 ffff88138fd3b888 0000000000008120
  <d> ffff88226b3c7be0 ffff88138fd3b9d0 ffff8828483c2e60 0000000000000021
  Call Trace:
  [<ffffffffa09eaf7e>] ? KsLHHMRecFnAddInt+0x2e/0x220 [oracleoks]
  [<ffffffffa0c674fe>] OfsGenFindFcb+0x36e/0x2270 [oracleacfs]
  [<ffffffffa0c6965f>] OfsGenFindFile+0x25f/0xe10 [oracleacfs]  
  [<ffffffffa09d8cf5>] ? KsMalloc+0x105/0x170 [oracleoks]    
  [<ffffffffa0db5be0>] ofs_lookup+0x330/0xa10 [oracleacfs]   
  [<ffffffff811b2d3b>] do_lookup+0x1ab/0x230
  [<ffffffff811b38fc>] __link_path_walk+0x79c/0x1090
  [<ffffffff811b44aa>] path_walk+0x6a/0xe0
  [<ffffffff811b46bb>] filename_lookup+0x6b/0xc0
  [<ffffffff811b57e7>] user_path_at+0x57/0xa0
  [<ffffffff812a4ba5>] ? _atomic_dec_and_lock+0x55/0x80
  [<ffffffff811c5df0>] ? mntput_no_expire+0x30/0x110
  [<ffffffff810f1720>] ? audit_filter_rules+0x230/0xd80
  [<ffffffff811a8960>] vfs_fstatat+0x50/0xa0
  [<ffffffff811a8a1e>] vfs_lstat+0x1e/0x20
  [<ffffffff811a8a44>] sys_newlstat+0x24/0x50
  [<ffffffff810f4227>] ? audit_syscall_entry+0x1d7/0x200
  [<ffffffff815662c2>] ? system_call_after_swapgs+0xa2/0x152
  [<ffffffff815662ce>] ? system_call_after_swapgs+0xae/0x152
  [<ffffffff815662c2>] ? system_call_after_swapgs+0xa2/0x152
  [<ffffffff815662ce>] ? system_call_after_swapgs+0xae/0x152
  [<ffffffff815662c2>] ? system_call_after_swapgs+0xa2/0x152
  [<ffffffff815663a7>] system_call_fastpath+0x35/0x3a
  [<ffffffff815662ce>] ? system_call_after_swapgs+0xae/0x152
  Code: 90 45 89 e9 41 83 c9 10 89 07 48 8b 1b 48 85 db 75 19 e9 fd 01 00 00 0f 1f 40 00 48 8b 9b 80 03 00 00 48 85 db 0f 84 e9 01 00 00 <4c> 39 7b 28 75 ea 4c 39 63 10 75 e4 31 f6 83 bb 68 02 00 00 01 
  RIP  [<ffffffffa0be37d0>] ofs_fcbtable_lookup+0x170/0xb30 [oracleacfs]
  RSP <ffff88138fd3b7e8>
  CR2: 0000000100000029