Kernel panics with RIP "show_partition+209" in Red Hat Enterprise Linux 4/5.

Issue

• RHEL-4/5 kernel panic at function show_partition+209 with following call traces:

Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP: 
<ffffffff802559af>{show_partition+209} 
PML4 b4b89067 PGD b4b53067 PMD 0 
Oops: 0000 [1] SMP 
CPU 2 
Modules linked in: cpqci(U) mptctl sg md5 ipv6 nfs lockd nfs_acl autofs4 i2c_dev i2c_core sunrpc ide_dump cciss_dump scsi_dump
diskdump zlib_deflate lpfcdfc qioctlmod qla2xxx vxspec(U) vxio(U) vxdmp(U) fdd(U) vxportal(U) vxfs(U) dm_mod button battery ac
hw_random k8_edac edac_mc tg3 e1000 floppy ext3 jbd lpfc scsi_transport_fc sata_nv libata mptsas cciss mptspi mptscsi mptbase
usb_storage uhci_hcd ohci_hcd ehci_hcd sd_mod scsi_mod 
Pid: 23056, comm: cmaperfd Tainted: PF     2.6.9-67.0.1.ELsmp 
RIP: 0010:[<ffffffff802559af>] <ffffffff802559af>{show_partition+209} 
RSP: 0018:00000100b4405e68  EFLAGS: 00010202 
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002 
RDX: 0000000000000000 RSI: ffffffff8033bdac RDI: 00000100e9e3ff80 
RBP: 00000100010a5c00 R08: 00000000fffffffb R09: 00000100b4405e68 
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 
R13: 00000100e9e3ff80 R14: 0000000000000178 R15: 0000000000000000 
FS:  0000002a95562b00(0000) GS:ffffffff804f2f00(005b) knlGS:00000000f7fe76c0 
CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b 
CR2: 0000000000000008 CR3: 00000000c06c0000 CR4: 00000000000006e0 
Process cmaperfd (pid: 23056, threadinfo 00000100b4404000, task 000001007b01b7f0) 
Stack: 327031504d447856 0000000039703000 0000000000000246 0000000000000246 
       0000000000000246 00000100010a5c00 00000100e9e3ff80 0000000000000000 
       0000000000000400 ffffffff80198642 
Call Trace:<ffffffff80198642>{seq_read+445} <ffffffff8017ad28>{vfs_read+207} 
       <ffffffff8017af84>{sys_read+69} <ffffffff80126723>{cstar_do_call+27}