rmmod ip_conntrack hangs.....

["Nishit Shah" <nishit@elitecore.com>]

Hi,
        when I do rmmod ip_conntrack, rmmod hangs. It is not the case
everytime but sometimes "rmmod ip_conntrack" hangs.
        After that I have tried to debug the problem and got following
observations..

    1.) in net/ipv4/netfilter/ip_conntrack_core.c, following code of
function ip_conntrack_cleanup is stuck in infinite loop...

 i_see_dead_people:
        ip_conntrack_flush();
        if (atomic_read(&ip_conntrack_count) != 0) {
                schedule();
                goto i_see_dead_people;
        }

    2.) after that i have added printk in while loop

 i_see_dead_people:
        ip_conntrack_flush();
        if (atomic_read(&ip_conntrack_count) != 0) {
                schedule();
                if (net_ratelimit())
                        printk(KERN_ERR "conntrack count is<%d>\n",
atomic_read(&ip_conntrack_count));
                goto i_see_dead_people;
        }

        And each and every time I got count value as 1.
        Also at this point, "cat /proc/slabinfo | grep conntrack" lists 1
entry allocated from slab.


Regards,
Nishit Shah.