cannot release a UDP kernel socket - why ?

[Mark Ryden <markryde@xxxxxxxxx>]

Hello,
 The following module creates a UDP kernel socket which calls sock_recvms.
after insmoding the module ,
netstat -nl | grep 4000 shows that indeed a socket was created and that it
listens on port 4000.
However, after running rmmod  on the module, it does **not** close the socket.
netstat -nl | grep 4000 shows that it **does** exist; the "rmmod"
itself hangs, and
there are no kernel messages.
Any ideas?

The code of the module is below:

static int createUdpInSocket(void)
{
	int res;
	struct sockaddr_in server;
	int servererror;
	unsigned char *buf;
	printk( KERN_ERR "createUdpInSocket\n" );

	if( sock_create( PF_INET,SOCK_DGRAM,IPPROTO_UDP,&udpInserversocket)<0 ) {
		printk(KERN_ERR "server: Error creating udpserversocket.\n" );
		return -EIO;
	}
	server.sin_family      = AF_INET;
	server.sin_addr.s_addr = INADDR_ANY;
	server.sin_port = htons((unsigned short)4000);
	servererror = udpInserversocket->ops->bind(udpInserversocket,
			(struct sockaddr *) &server, sizeof(server) );
		{
		struct msghdr msg;
		struct iovec iov;
		mm_segment_t oldfs;
		int size = 0;
		int len = 160;
		iov.iov_base = buf;
		msg.msg_flags = 0;
		msg.msg_name = &server;
		msg.msg_namelen  = sizeof(struct sockaddr_in);
		msg.msg_control = NULL;
		msg.msg_controllen = 0;
		msg.msg_iov = &iov;
		msg.msg_iovlen = 1;
		msg.msg_control = NULL;

		oldfs = get_fs();
		set_fs(KERNEL_DS);
		printk("before sock_recvmsg in %s %s\n",__FUNCTION__,__FILE__);
		size = sock_recvmsg(udpInserversocket,&msg,len,msg.msg_flags);
		printk("after sock_recvmsg in %s %s\n",__FUNCTION__,__FILE__);
		set_fs(oldfs);

		}
}


static int kernThread(void *arg)
{
	allow_signal(SIGKILL);

  createUdpInSocket();

	return 0;
}


static int __init nic_init(void)
	{
	int ret;	
	void *kdata;
	p = kthread_run(kernThread,kdata,"myKernThread");
		
	return 0;	
	}

//////////////////////////////////////////////////////////////////////////////

static void __exit nic_exit(void)
	{
	printk("in nic_exit\n");
  if (p)
	  kthread_stop(p);

	if (udpInserversocket)
		sock_release(udpInserversocket);		

	}

	
//////////////////////////////////////////////////////////////////////////////

module_init(nic_init)
module_exit(nic_exit)

Regards,
Mark Ryden

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