Kernel panic in unhook_ptregscall32() function.

Issue

• System crashed and generated a vmcore, RCA required.
• Kernel panic in unhook_ptregscall32() function with following call traces.

Unable to handle kernel NULL pointer dereference at 0000000000000003 RIP: 
 [<ffffffff886654a1>] :seos:unhook_ptregscall32+0x43/0x68
PGD 16ae10067 PUD 21c8fe067 PMD 0 
Oops: 0002 [1] SMP 
last sysfs file: /devices/pci0000:00/0000:00:11.0/0000:02:00.0/irq
CPU 1 
Modules linked in: seos(PU) 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 8021q libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi vsock(U) vmci(U) vmmemctl(U) acpiphp dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec dell_wmi wmi button battery asus_acpi acpi_memhotplug ac lp ide_cd e1000 floppy i2c_piix4 parport_pc parport i2c_core cdrom sg serio_raw shpchp tpm_tis tpm tpm_bios pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod ata_piix libata mptspi mptscsih mptbase scsi_transport_spi sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 15072, comm: ps Tainted: P     ---- 2.6.18-274.el5 #1
RIP: 0010:[<ffffffff886654a1>]  [<ffffffff886654a1>] :seos:unhook_ptregscall32+0x43/0x68
RSP: 0000:ffff810235e11df0  EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000601 RSI: 0000000000000202 RDI: ffffffff88684180
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000000000003f
R10: ffff810235e11cc8 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88684180 R14: 0000000000003ae0 R15: 0000000000000000
FS:  00002aac6c275f80(0000) GS:ffff81010b7437c0(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000003 CR3: 000000031192f000 CR4: 00000000000006a0
Process ps (pid: 15072, threadinfo ffff810235e10000, task ffff8101a28f0820)
Stack:  0000000000000060 0000000000000003 ffffffff80291280 0000000080000000
 ffffffff88665675 0000000000000000 ffffffff8028ff40 0000000000000000
 ffffffff88665ad9 0000000000000000 0000000288652225 0000000000000000
Call Trace:
 [<ffffffff88665675>] :seos:restore_x86_64_ia32_syscalls+0xaa/0xe4
 [<ffffffff88665ad9>] :seos:restore_syscalls+0x2c/0x11b
 [<ffffffff88652c71>] :seos:SEOS_intercept+0x41/0x1e7
 [<ffffffff8864ce5c>] :seos:eAC_seosd_down+0x2d/0xc3
 [<ffffffff8864d2b6>] :seos:eAC_route_file+0x98/0x579
 [<ffffffff8865c7c8>] :seos:check_file_access+0x183/0x1b4
 [<ffffffff8865e75a>] :seos:my_open+0x110/0x230
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0


Code: 41 89 44 24 03 e8 89 fd ff ff 48 63 85 84 41 68 88 48 c1 e0 
RIP  [<ffffffff886654a1>] :seos:unhook_ptregscall32+0x43/0x68
 RSP <ffff810235e11df0>