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SubjectRe: newbie Q: kernel BUG at vmalloc.c??
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OK, please ignore this. I was making a rather stupid mistake. I clearly am in need of another caffeine fix. ;)

Thanks anyway

FJ

On Monday 04 March 2002 13:17, Fernando Jimenez wrote:
> Hi all
>
> I am coding a relatively simple (although it's proving quite hard) module
> for the linux kernel, and I have bumped into this!!
>
> Mar 4 13:09:55 localhost kernel: kernel BUG at vmalloc.c:235!
> Mar 4 13:09:55 localhost kernel: invalid operand: 0000
> Mar 4 13:09:55 localhost kernel: CPU: 0
> Mar 4 13:09:55 localhost kernel: EIP: 0010:[<c01320a6>] Not tainted
> Mar 4 13:09:55 localhost kernel: EFLAGS: 00000282
> Mar 4 13:09:55 localhost kernel: eax: 0000001d ebx: 0804b000 ecx:
> 00000001 edx: 000021ba Mar 4 13:09:55 localhost kernel: esi: 0804aa20
> edi: 00000000 ebp: c616ff98 esp: c616ff14 Mar 4 13:09:55 localhost
> kernel: ds: 0018 es: 0018 ss: 0018
> Mar 4 13:09:55 localhost kernel: Process ioctl (pid: 1121,
> stackpage=c616f000) Mar 4 13:09:55 localhost kernel: Stack: c028bf79
> 000000eb 00000002 00000001 00000282 00000001 c0350a64 00000246 Mar 4
> 13:09:55 localhost kernel: 00000024 c616ff98 0804aa20 0804aa20
> 00000000 c616ff98 c8829e08 0804aa20 Mar 4 13:09:55 localhost kernel:
> 000001f2 00000163 c013faed c585537c c5feb23c c68cdc94 c7d1a000 c13b396c
> Mar 4 13:09:55 localhost kernel: Call Trace: [<c8829e08>] [<c013faed>]
> [<c0114906>] [<c0150706>] [<c01075bb>] Mar 4 13:09:55 localhost kernel:
> Mar 4 13:09:55 localhost kernel: Code: 0f 0b 5b 5e 31 c0 e9 a4 02 00 00 6a
> 02 53 e8 d7 fd ff ff 5a
>
> I'm sure I must be doing something wrong somewhere, but the line "kernel
> BUG at vmalloc" does look worrying, and I don't quite know where it's
> comming from. I'm using kernel 2.4.17 on a RH7.2 box, and the ofending part
> of code is:
>
> mdp_blks_use = vmalloc(mdp_blk_use_size * sizeof(char));
>
> where mdp_blk_use_size is an integer, and I'm sure it's been set to
> something, and mdp_blks_use is a char pointer. I have used vmalloc in other
> parts of the code and it works fine. This is very confusing
>
> Sorry if I'm doing something glaringly stupid here, still quite a newbie at
> kernel hacking. :) Thanks for your help -
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