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Subjectparport OOPS with 2.1.48

echo 7 > /proc/parport/0/irq OOPSed on me. Doing it a second time caused
another oops, and additionally froze the bash session which did it (stuck
in kernel code, apparently, as kill -9 doesn't work).

(I'm using parport_pc as the low-level driver, if that helps)

Here is the OOPS:


Unable to handle kernel NULL pointer dereference at virtual address 00000010
current->tss.cr3 = 01989000, xr3 = 01989000
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c282e0af>]
EFLAGS: 00010006
eax: 00000000 ebx: c1fa6a40 ecx: 00000007 edx: ffffff07
esi: 20000000 edi: 00000000 ebp: c157fef0 esp: c157fed0
ds: 0018 es: 0018 ss: 0018
Process bash (pid: 2114, process nr: 51, stackpage=c157f000)
Stack: c010a4eb 00000007 c1a2aa00 c157fef8 c01a1534 00000000 c1fa6a40 00000007
20000000 c0109700 c01a1534 00000007 00000246 00000000 c1fa6a40 20000000
ffffff00 00000018 00000018 ffffff07 c010a5f6 00000010 00000246 c1fa6a40
Call Trace: [<c010a4eb>] [<c0109700>] [<c010a5f6>] [<c282e0a8>] [<c010a668>] [<c2827040>] [<c282692b>]
[<c282e0a8>] [<c282f273>] [<c0144e1e>] [<c0122a79>] [<c010961a>]
Code: 8b 40 10 83 78 14 00 74 0c 83 c0 14 50 e8 4f 11 8e fd 83 c4
Aiee, killing interrupt handler

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

Trace: c010a4eb <do_IRQ+7f/f4>
Trace: c0109700 <ret_from_intr>
Trace: c010a5f6 <setup_x86_irq+96/a0>
Trace: c282e0a8
Trace: c010a668 <request_irq+68/84>
Trace: c2827040
Trace: c282692b
Trace: c282e0a8
Trace: c282f273
Trace: c0144e1e <proc_file_write+2a/38>
Trace: c0122a79 <sys_write+b9/10c>
Trace: c010961a <system_call+3a/40>

Code:
Code: 8b 40 10 movl 0x10(%eax),%eax
Code: 83 78 14 00 cmpl $0x0,0x14(%eax)
Code: 74 0c je 15 <_EIP+15>
Code: 83 c0 14 addl $0x14,%eax
Code: 50 pushl %eax
Code: e8 4f 11 8e fd call fd8e1161 <_EIP+fd8e1161>
Code: 83 c4 00 addl $0x0,%esp
Code: 90 nop
Code: 90 nop
Code: 90 nop


--
-Neil Moore http://www.sfhs.floyd.k12.ky.us/~amethyst/
(finger amethyst@valjean.sfhs.floyd.k12.ky.us for my Geek Code)

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