My module freezes the kernel

[thefly]

Hello everybody. I finised developing my module (actually modifying
ng_netflow), and my code can be found at
http://www.acaro.org/ng_netflow-0.2.4/ i added a few hooks to my code
inside ng_netflow.c in the constructor, rmnode, rcvdata etc etc, and the
mmap/ioctl code. The rest of my code is found in ng_counter.c. I'm
testing it, and it happens it makes my box panic. 
I tested it using linux's packetgenerator building 95Mb/s, and the box
doesn't freeze. I tested it with an nmap on ALL ports range (1-65535),
and it logs it. But with high traffic, and actually general purpouse
traffic (scp of a big file plus 4 nmaps + some ftp + some http etc etc)
the code panics saying the kernel is trying to access a page which
doesn't exist. This happens simply counting, not while doing mmap() or
ioctl(). The actual code that counts is this:

static int
_add_traffic(struct ng_counter_data *counters, u_int16_t dest_port, u_short packet_len, char prot)
{
        u_int64_t * dest, old_val;

        if(dest_port < 0 || dest_port > 65535)
                return EINVAL;

        mtx_lock(&counters->counter_lock);

        switch(prot){
                case UDP_P: dest = counters->B_array+ARRAY_SHIFT; break;
                case TCP_P: dest = counters->B_array; break;
                default: return EINVAL;
        }

        old_val = *(dest+dest_port);
        *(dest+dest_port) += packet_len;

        mtx_unlock(&counters->counter_lock);

        return 0;
}

i don't know how netgraph reacts with my lockings, and what the problem
might be. I tested it on a freebsd 5.2.1 both on a UP and a dual SMP
box, and i've got the same problem on both of them. The two big memory
chunks are given me by contigmalloc(), it can be found in
ng_counter.c:ng_counter_constr().


I don't know what it can be, because under medium load it works, but
with high variegate load it crashes.So it doesn't seem to be a coding
error, and all the shared data is under the mutex lock.


TIA

-- 
    Claudio "thefly" Martella
    thefly at acaro.org
    GNU/PG keyid: 0x8EA95625
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