Description of Problem:
kernel oops when mounting intermezzo fs

Version-Release number of selected component (if applicable):
kernel-smp-2.4.18-17.8.0

How Reproducible:
always

Steps to Reproduce:
1. modprobe intermezzo
2. mount -t intermezzo /dev/sda4 /intermezzo/seward

Actual Results:
Here is the output of dmesg:
  InterMezzo Kernel/Lento communications, v1.04, braam
  3w-xxxx: scsi0: AEN: INFO: Initialization started: Unit #0.
  Unable to handle kernel NULL pointer dereference at virtual address 00000000
   printing eip:
  c0156ed4
  *pde = 00000000
  Oops: 0000
  intermezzo emu10k1 sound soundcore ac97_codec mga agpgart nfsd nfs lockd sunrp
  CPU:    0
  EIP:    0010:[<c0156ed4>]    Not tainted
  EFLAGS: 00010292

  EIP is at path_init [kernel] 0x14 (2.4.18-17.8.0smp)
  eax: 00000000   ebx: e0571de4   ecx: e0571de4   edx: 00000008
  esi: 00000000   edi: 00000000   ebp: e0571e8c   esp: e0571da8
  ds: 0018   es: 0018   ss: 0018
  Process mount (pid: 6827, stackpage=e0571000)
  Stack: c015243e c35eaf00 00000000 00000000 00000000 fb511134 e0562580 00000000 
         00000000 e0570000 fb52bc2b 00000000 e0571de4 00000000 00000000 00000000 
         00000000 00000000 00000000 00000286 00000008 00000001 00000000 00000000 
  Call Trace: [<c015243e>] blkdev_get [kernel] 0x7e (0xe0571da8))
  [<fb511134>] presto_walk [intermezzo] 0x24 (0xe0571dbc))
  [<fb52bc2b>] presto_get_minor [intermezzo] 0x4b (0xe0571dd0))
  [<fb52befc>] presto_read_super [intermezzo] 0x10c (0xe0571e14))
  [<c0150b7c>] get_sb_bdev [kernel] 0x1bc (0xe0571eb0))
  [<fb537868>] presto_fs_type [intermezzo] 0x0 (0xe0571ef4))
  [<c0150f31>] do_kern_mount [kernel] 0x121 (0xe0571efc))
  [<fb537868>] presto_fs_type [intermezzo] 0x0 (0xe0571f00))
  [<c01667a3>] do_add_mount [kernel] 0x93 (0xe0571f20))
  [<c0166ad0>] do_mount [kernel] 0x160 (0xe0571f40))
  [<c0166919>] copy_mount_options [kernel] 0x79 (0xe0571f70))
  [<c0166fbf>] sys_mount [kernel] 0xdf (0xe0571f90))
  [<c0109457>] system_call [kernel] 0x33 (0xe0571fc0))


  Code: 80 38 2f 74 67 ba 00 e0 ff ff 21 e2 8b 82 50 06 00 00 83 c0 
 



Additional Information:

lsmod:
  Module                  Size  Used by    Not tainted
  intermezzo            195912   0  (unused)
  emu10k1                73032   0  (unused)
  sound                  77708   0  [emu10k1]
  soundcore               7108   7  [emu10k1 sound]
  ac97_codec             13512   0  [emu10k1]
  mga                   108992   1
  agpgart                43776   3
  nfsd                   81552   8  (autoclean)
  nfs                    85988   1  (autoclean)
  lockd                  58768   1  (autoclean) [nfsd nfs]
  sunrpc                 84668   1  (autoclean) [nfsd nfs lockd]
  3c59x                  31344   2
  ipchains               45004 720
  st                     31440   0  (unused)
  ext3                   72992   2
  jbd                    56688   2  [intermezzo ext3]
  aic7xxx               138356 0  (unused)
  3w-xxxx                33792   4
  sd_mod                 13552   8
  scsi_mod              110376   4  [st aic7xxx 3w-xxxx sd_mod]




cat /proc/partitions:

major minor  #blocks  name     rio rmerge rsect ruse wio wmerge wsect wuse
running use aveq

   8     0  293054208 sda 19392 114302 1068770 442734 24087 92509 934302 3751179
0 353105 4193919
   8     1     104391 sda1 19 161 360 125 20 25 94 935 0 890 1060
   8     2    2048287 sda2 1 0 8 9 0 0 0 0 0 9 9
   8     3  280591290 sda3 19349 114135 1068242 442156 24049 92484 934064
3749806 1 2870925 7013056
   8     4   10305697 sda4 21 0 144 376 18 0 144 439 0 816 816
   8    16    1045525 sdb 1 3 8 21 0 0 0 0 0 21 21
   8    20    1045488 sdb4 0 0 0 0 0 0 0 0 0 0 0