On Wed, Dec 13, 2000 at 10:53:37AM +0100, Christian Gennerat wrote:
> Jean Tourrilhes a �crit :
>
> > Anything that is IrDA related is worth sending. I still don't
> > understand why your IrDA stack behave differently.
>
> Is a Pentium 75 too slow?
Nope, should do fine...
> my last oops (5 occurences) is a looping oops:
[...]
> >>EIP; c3058ea5 <[irda]irlap_update_nr_received+4d/130> <=====
> Trace; c305bb6d <[irda]irlap_state_nrm_s+151/76c>
> Trace; c3059c71 <[irda]irlap_do_event+65/17c>
> Trace; c3063ae6 <[irda]async_unwrap_char+2a/34>
> Trace; c305e184 <[irda]irlap_driver_rcv+2ac/318>
> Trace; c3075100 <[irda]irda_packet_type+0/14>
This doesn't make sense. You can't have async_unwrap_char at
this point. You would need something like irlap_recv_XXX_frame to make
sense.
Hum... Smell like corruption...
> Code; c3058ea5 <[irda]irlap_update_nr_received+4d/130>
> 00000000 <_EIP>:
> Code; c3058ea5 <[irda]irlap_update_nr_received+4d/130> <=====
> 0: 89 58 04 mov %ebx,0x4(%eax) <=====
> Code; c3058ea8 <[irda]irlap_update_nr_received+50/130>
> 3: 89 03 mov %eax,(%ebx)
> Code; c3058eaa <[irda]irlap_update_nr_received+52/130>
> 5: c7 02 00 00 00 00 movl $0x0,(%edx)
> Code; c3058eb0 <[irda]irlap_update_nr_received+58/130>
> b: c7 42 04 00 00 00 00 movl $0x0,0x4(%edx)
> Code; c3058eb7 <[irda]irlap_update_nr_received+5f/130>
> 12: c7 42 00 00 00 00 00 movl $0x0,0x0(%edx)
As far as I can tell, the Oops occur in __skb_dequeue(), which
is inlined (see include/linux/skbuff.h @ 495), at "next->prev = prev".
Those skb functions have been thouroughly debugged by Alan
Cox, and I don't expect a bug lying here. Getting an invalid skb on
the list is quite difficult.
Therefore, I suspect an internal corruption of the IrDA stack,
like something copying bytes were it should not or a buffer overrun
(likely in the previous skb).
I've seen that happening. Factors that seem to increase the
probability of getting there are :
o SMP
o Compiling IrDA stack static and not modular (don't ask me why)
o High level of IrDA noise
At this point, I would like to ask Dag if he has any clues...
The second trace is totally space. I can't make sense of it...
Regards,
Jean
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