kernel panic at fib6_clean_all() on Red Hat Enterprise Linux 6

Issue

• When java process referred to /proc/net/ipv6_route during system start, a panic occurred.

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<f8f107ea>] fib6_clean_all+0x2a/0xa0 [ipv6]
*pdpt = 000000002ca31001 *pde = 0000000000000000 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/0000:04:00.0/net/eth2/addr_assign_type
Modules linked in:
e1000e 0000:0f:00.0: eth5: (PCI Express:2.5GB/s:Width x1) 00:1b:21:9b:88:5d
e1000e 0000:0f:00.0: eth5: Intel(R) PRO/1000 Network Connection
e1000e 0000:0f:00.0: eth5: MAC: 1, PHY: 4, PBA No: D50858-007
 ipv6(+) e1000e igb dca ext4 mbcache jbd2 mppVhba(U) sr_mod cdrom mpt2sas scsi_transport_sas raid_class ahci megaraid_sas mppUpper(U) sg sd_mod crc_t10dif dm_mod [last unloaded: scsi_wait_scan]

Pid: 1940, comm: java Not tainted (2.6.32-131.0.15.el6.i686 #1) HA8000/RS440
EIP: 0060:[<f8f107ea>] EFLAGS: 00010246 CPU: 24
EIP is at fib6_clean_all+0x2a/0xa0 [ipv6]
EAX: 00000000 EBX: c0bed5c0 ECX: 00000000 EDX: f8f0c590
ESI: c14da440 EDI: 00000001 EBP: f8f0c590 ESP: ea47dec4
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process java (pid: 1940, ti=ea47c000 task=ee704030 task.ti=ea47c000)
Stack:
00000000 00000000 00000000 00000000 eec31580 00000000 00000000 00000000
<0> eee205b8 00000000 b777b000 b777d000 00000000 00000000 c14da440 00000001
<0> 00000000 f8f0c557 c14da440 c05449d0 00001000 000000d0 ee0f1640 00000000
Call Trace:
 [<f8f0c557>] ? ipv6_route_show+0x17/0x20 [ipv6]
 [<c05449d0>] ? seq_read+0x100/0x3d0
 [<c05a83b7>] ? selinux_file_permission+0xe7/0x130
 [<c05448d0>] ? seq_read+0x0/0x3d0
 [<c0574804>] ? proc_reg_read+0x64/0xa0
 [<c05747a0>] ? proc_reg_read+0x0/0xa0
 [<c05289ad>] ? vfs_read+0x9d/0x190
 [<c0528ae1>] ? sys_read+0x41/0x70
 [<c0409adf>] ? sysenter_do_call+0x12/0x28
Code: 00 55 57 56 53 89 d3 83 ec 34 89 dd c7 44 24 04 00 00 00 00 89 c3 88 4c 24 03 8d b4 26 00 00 00 00 8b 44 24 04 03 83 60 02 00 00 <8b> 30 85 f6 74 4e 8b 06 0f 18 00 90 8d 7e 0c 89 f8 e8 60 40 91 
EIP: [<f8f107ea>] fib6_clean_all+0x2a/0xa0 [ipv6] SS:ESP 0068:ea47dec4
CR2: 0000000000000000
---[ end trace 4d8b302a2bf0703e ]---
lo: Disabled Privacy Extensions
Kernel panic - not syncing: Fatal exception
Pid: 1940, comm: java Tainted: G      D    ----------------   2.6.32-131.0.15.el6.i686 #1
Call Trace:
 [<c0821fde>] ? panic+0x42/0xf9
 [<c0825ddc>] ? oops_end+0xbc/0xd0
 [<c0432472>] ? no_context+0xc2/0x190
 [<c04326eb>] ? bad_area+0x3b/0x50
 [<c0432b8e>] ? __do_page_fault+0x34e/0x420
 [<c05a52c3>] ? inode_has_perm+0x63/0xc0
 [<c0574ce2>] ? proc_reg_open+0x112/0x180
 [<f8f0c590>] ? rt6_info_route+0x0/0xc0 [ipv6]
 [<c082777a>] ? do_page_fault+0x2a/0x90
 [<c0827750>] ? do_page_fault+0x0/0x90
 [<f8f0c590>] ? rt6_info_route+0x0/0xc0 [ipv6]
 [<c08251c7>] ? error_code+0x73/0x78
 [<f8f0c590>] ? rt6_info_route+0x0/0xc0 [ipv6]
 [<f8f0c590>] ? rt6_info_route+0x0/0xc0 [ipv6]
 [<f8f107ea>] ? fib6_clean_all+0x2a/0xa0 [ipv6]
 [<f8f0c557>] ? ipv6_route_show+0x17/0x20 [ipv6]
 [<c05449d0>] ? seq_read+0x100/0x3d0
 [<c05a83b7>] ? selinux_file_permission+0xe7/0x130
 [<c05448d0>] ? seq_read+0x0/0x3d0
 [<c0574804>] ? proc_reg_read+0x64/0xa0
 [<c05747a0>] ? proc_reg_read+0x0/0xa0
 [<c05289ad>] ? vfs_read+0x9d/0x190
 [<c0528ae1>] ? sys_read+0x41/0x70
 [<c0409adf>] ? sysenter_do_call+0x12/0x28