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paging fault while jffs2 unmount



hi
 with kernel 2.4.8 (rmk2 , np1)
when i unmount the jffs2 partition iam getting the following error

MTD_open
MTD_ioctl
Unable to handle kernel paging request at virtual address 00005401
pgd = c194c000
*pgd = c1a10801, *pmd = c1a10801, *pte = 00000000, *ppte = 00000000
Internal error: Oops: 0
CPU: 0
pc : [<c0143338>]    lr : [<c0143fb4>]
sp : c1953e6c  ip : c1953e7c  fp : c1953e78
r10: ffffffff  r9 : c019542d  r8 : 00000000
r7 : ffffffe7  r6 : 00005401  r5 : 00005401  r4 : c0195413
r3 : c0173100  r2 : 00005401  r1 : fffffffe  r0 : 00005401
Flags: Nzcv  IRQs off  FIQs on  Mode SVC_32  Segment user
Control: C194D17F  Table: C194D17F  DAC: 00000015
Process cat (pid: 68, stackpage=c1953000)
Code: e3710001 0a000009 (e5d23000) e3530000 0a000006
Stack:
c1953e40:
c0143
c1953e60: c0143338 80000093 ffffffff c1953ec4  c1953e7c c0143fb4
c0143328 c001b
c1953e80: c018488c c1953ec4 00000000 0000000a  c1953f04 c0195413
c01669e7 c0195
c1953ea0: bffffbb8 00005401 ffffffe7 00000000  00000036 c02dc160
c1953ef8 c1953
c1953ec0: c0026290 c0143bf0 20000013 0000000d  00005401 bffffbb8
00005401 fffff
c1953ee0: 00000000 00000036 c02dc160 c1953f88  c1953f0c c00d87e8
c0026268 c0166
c1953f00: 00005401 00000001 00000000 c1953f5c  c1953f1c c0036690
c0037924 00000
c1953f20: c1952000 00000000 fffffff4 00000000  00000003 c1952000
00000000 00000
c1953f40: 00001000 00000003 00000000 00000022  c1953fac c1953f60
c001e854 c0036
c1953f60: bffffbb8 c1897500 00005401 ffffffe7  00000003 00000036
40104f28 c1953
c1953f80: c1953f8c c00585b4 c00d8750 bffffc10  00001000 20000010
00000002 c001a
c1953fa0: 00000000 c1953fb0 c001a6e0 c0058374  bffffc10 c0021780
00000003 00005
c1953fc0: bffffbb8 fbad2488 bffffc10 00001000  00000001 00000002
02001ec4 02018
c1953fe0: 40104f28 bffffc0c bffffc10 bffff978  400b4ca4 400b54c4
20000010 00000
Backtrace:
Function entered at [<c014331c>] from [<c0143fb4>]
Function entered at [<c0143be4>] from [<c0026290>]
Function entered at [<c002625c>] from [<c00d87e8>]
Function entered at [<c00d8744>] from [<c00585b4>]
Function entered at [<c0058368>] from [<c001a6e0>]
 r8 = C001A864  r7 = 00000002  r6 = 20000010  r5 = 00001000
 r4 = BFFFFC10
Segmentation fault

can any one help me out
regards
ashok
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