kernel panic with NULL pointer dereference in kail:find_vfsmount ()

Solution Unverified - Updated -

Issue

  • kernel panic with NULL pointer dereference in find_vfsmount () with following traces:
kail_assert: /project/oss600/build/oss600/src/oss/kazn/kail/kail_lsm.c:150
Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
f8bbb5e2
*pde = 24afc001
Oops: 0002 [#1]
SMP 
Modules linked in: parport_pc lp parport autofs4 i2c_dev i2c_core nfs lockd nfs_acl vmmemctl(U) sunrpc md5 ipv6 kaznmod(U) kail(U) ide_dump scsi_dump diskdump zlib_deflate vmhgfs(U) button battery ac pcnet32 vmxnet(U) mii floppy dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod ata_piix libata mptscsih mptsas mptspi mptscsi mptbase sd_mod scsi_mod
CPU:    0
EIP:    0060:[<f8bbb5e2>]    Tainted: GF     VLI
EFLAGS: 00010296   (2.6.9-55.ELsmp) 
EIP is at find_vfsmount+0xf2/0x120 [kail]
eax: 0000004b   ebx: f46c3214   ecx: d0cdee58   edx: f8bbedfe
esi: c5248880   edi: c5248e00   ebp: 00000000   esp: d0cdee60
ds: 007b   es: 007b   ss: 0068
Process chown (pid: 30710, threadinfo=d0cde000 task=db4932f0)
Stack: f7ffb608 c5248780 dac0789c 00000000 dac0789c d0cdef64 f513cbb0 f8bbca44 
       00000000 00000000 d0cdef64 00000000 00000000 00000000 00000000 f5b50000 
       c01678ea f7cdc344 c5248e00 00001000 00001000 0804f72e d0cdef50 0000056d 
Call Trace:
 [<f8bbca44>] kail_sec_inode_setattr+0x24/0x1c0 [kail]
 [<c01678ea>] link_path_walk+0x94/0xbe
 [<c01667fa>] permission+0x69/0x6e
 [<c02d443f>] __cond_resched+0x14/0x39
 [<c01a8829>] capable+0x15/0x2c
 [<c01726cc>] inode_change_ok+0x80/0x114
 [<c0172af2>] notify_change+0x18a/0x24a
 [<c015a493>] chown_common+0xc1/0xd9
 [<c015be7c>] fget+0x3b/0x42
 [<c015a546>] sys_fchown+0x26/0x34
 [<c02d5ee3>] syscall_call+0x7/0xb
Code: 38 83 e8 38 89 44 24 04 8d 41 38 3b 04 24 75 ba 85 ed 75 83 68 96 00 00 00 68 20 e3 bb f8 68 fe ed bb f8 e8 13 73 56 c7 83 c4 0c <c6> 05 00 00 00 00 00 e9 60 ff ff ff 89 f6 89 cd eb b9 89 cd eb 

Environment

  • Red Hat Enterprise Linux 4
  • IBM Tivoli Access Manager

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