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Subject2.1.20: Oops in refile_buffer

while running a perl script (as root), that reads through all
blocks of my (active) swap partition I got the Oops appended below:
(may be the answer is: Don't do that then!)

VFS: brelse: Trying to free free buffer
last message repeated 14 times
Unable to handle kernel NULL pointer dereference at virtual address 0000003e
current->tss.cr3 = 00d84000, %cr3 = 00d84000
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c01261c0>]
EFLAGS: 00010206
eax: c0190002 ebx: c008a214 ecx: c008a214 edx: 00000006
esi: 00000000 edi: 080b6f70 ebp: c186bee0 esp: c186bd24
ds: 0018 es: 0018 ss: 0018
Process perl (pid: 3774, process nr: 38, stackpage=c186b000)
Stack: c008a214 c186bf9c 080b6f70 c01263fe c008a214 c008a214 00000000 00000400
c01297fd c008a214 c1262640 ffffffea 00000400 c0b18e88 00000001 00000400
00000000 00001000 00000000 00000400 c0190812 00003dc6 00000000 c186be9c
Call Trace: [<c01263fe>] [<c01297fd>] [<c0190812>] [<c0190002>] [<c019c8e1>] [<c019c95c>] [<c017cfff>]
[<c0182f75>] [<c017cfff>] [<c011247c>] [<c01124b4>] [<c01a10d8>] [<c011247c>] [<c01124b4>] [<c0123b27>]
Code: 89 42 38 8b 53 38 85 d2 74 06 8b 43 0c 89 42 0c 66 8b 43 04

Using `/boot/' to map addresses to symbols.

>>EIP: c01261c0 <refile_buffer+104/320>

Code: c01261c0 <refile_buffer+104/320> movl %eax,0x38(%edx)
Code: c01261c3 <refile_buffer+107/320> movl 0x38(%ebx),%edx
Code: c01261c6 <refile_buffer+10a/320> testl %edx,%edx
Code: c01261c8 <refile_buffer+10c/320> je c01261d0 <refile_buffer+114/320>
Code: c01261ca <refile_buffer+10e/320> movl 0xc(%ebx),%eax
Code: c01261cd <refile_buffer+111/320> movl %eax,0xc(%edx)
Code: c01261d0 <refile_buffer+114/320> movw 0x4(%ebx),%ax
Code: c01261d4 <refile_buffer+118/320>


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