Re: Race condition in network driver

[Shine Mohamed <shinemohamed_j@xxxxxxxxxxxxxx>]

Hi Satyendra Bhaisare,

On Tuesday 03 February 2004 20:01, Satyendra Bhaisare wrote:
> Hi all,
> I am stress testing a network driver on IXP12xx platform. In normal ping,
> the driver works fine.
> However, on some occassion during flood ping testing, It crashes. The dump
> when analyzed shows the following sequence of calls made.
>
> start_kernel -> rest_init -> cpu_idle -> do_IRQ .....

Here your ISR registered for the driver comes into picture. 

Then u allocate the socket buffer(sk_buff) and
using the netif_rx u might be registering to
the newly created sk_buff to the higher layer
(Actually in netif_rx the
do_softirq is called... to my knowledge)

From there its upto the kernel... So I think the
problem must be somewhere u allocating the 
skbuffer or setting any fields of skbuff...

These are only assumptions... Hope this may help
you...


>.......-> do_softirq ->
> net_rx_action -> ip_rcv -> ip_local_deliver -> tcp_v4_rcv -> __kfree_skb ->
> skb_release_data -> kfree -> __div0
>

Regards,
Shine Mohamed

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