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From
SubjectRe: Repeated kernel oops from 2.2.{5,7} router
On Fri, 7 May 1999, Roy Stogner wrote:

> eax: c02bde3c ebx: 00000001 ecx: c02bde30 edx: 00000000
> esi: c02bddc0 edi: c1fda000 ebp: c0200008 esp: c020bf28
[...]
> Code: c016570b <pfifo_fast_dequeue+1b/50> 00000000 <_EIP>: <===
> Code: c016570b <pfifo_fast_dequeue+1b/50> 0: 89 4a 04 movl %ecx,0x4(%edx) <===
> Code: c016570e <pfifo_fast_dequeue+1e/50> 3: 89 11 movl %edx,(%ecx)
> Code: c0165710 <pfifo_fast_dequeue+20/50> 5: c7 00 00 00 00 movl $0x0,(%eax)
> Code: c0165715 <pfifo_fast_dequeue+25/50> a: 00
> Code: c0165716 <pfifo_fast_dequeue+26/50> b: c7 40 04 00 00 movl $0x0,0x4(%eax)
> Code: c016571b <pfifo_fast_dequeue+2b/50> 10: 00 00
> Code: c016571d <pfifo_fast_dequeue+2d/50> 12: c7 40 00 00 00 movl $0x0,0x0(%eax)
> Code: c0165722 <pfifo_fast_dequeue+32/50> 17: 00 00

This is in __skb_dequeue:

prev = (struct sk_buff *) list;
next = prev->next;
result = NULL;
if (next != prev) {
result = next;
next = next->next;
list->qlen--;
next->prev = prev; <-- here
prev->next = next;
result->next = NULL;
result->prev = NULL;
result->list = NULL;
}
return result;

Somehow, list->next->next is NULL, even though it's a circular list.

Tim.
*/


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