[Click] click-uninstall error

[Beyers Cronje]

Hi all,

I get an intermittend "Unable to handle kernel NULL pointer
dereference" when using click-uninstall.

Log file and running click config shown at the bottom.
I'd say around 90% of the time click-uninstall works 100%. 

I'm running one custom element named "ipStats". Ive
included the cleanup stage routines of this custom element.
Am I not cleaning the hashmaps correctly or might this
error be related to one of the other elements?

Any ideas ?

Kind regards

Beyers Cronje

****Cleanup routines***************************
int P2PStats::initialize(ErrorHandler *) {
		_tcp_gc_timer.initialize(this);
		_tcp_gc_timer.schedule_after_s(_tcp_gc_interval);
		_tcp_done_gc_timer.initialize(this);
		_tcp_done_gc_timer.schedule_after_s(_tcp_done_gc_interval);
		
		_map.set_arena(router()->arena_factory());
		return 0;
};

void IPStats::clean_map() {
		FlowInfo *fi;
    for (Map::iterator iter = _map.begin(); iter; iter++)
{	//Clean Flow map
	    fi = iter.value();
			if (fi != 0)
      	delete fi;
    };
		potential_supernodes.clear();
		for (Map::iterator iter = _to_clean_map.begin(); iter;
iter++) {	//Clean any entries left in timedout or reset
flows
				fi = iter.value();
				if (fi != 0)
						delete fi;
		};
};

void IPStats::cleanup(CleanupStage) {
    clean_map();
};


*******Dump from log************************
Nov 29 22:38:32 slump kernel: device eth0 entered
promiscuous mode
Nov 29 22:41:53 slump kernel: device eth0 left promiscuous
mode
Nov 29 22:41:53 slump kernel: Unable to handle kernel NULL
pointer dereference at virtual address 00000003
Nov 29 22:41:53 slump kernel:  printing eip:
Nov 29 22:41:53 slump kernel: f89233b2
Nov 29 22:41:53 slump kernel: *pde = 00000000
Nov 29 22:41:53 slump kernel: Oops: 0000
Nov 29 22:41:53 slump kernel: CPU:    0
Nov 29 22:41:53 slump kernel: EIP:    0010:[<f89233b2>]
   Not tainted
Nov 29 22:41:53 slump kernel: EFLAGS: 00010297
Nov 29 22:41:53 slump kernel: eax: fffffecf   ebx: 00000003
  ecx: c0368d60   edx: f602b500
Nov 29 22:41:53 slump kernel: esi: f5bc23a4   edi: f5bc2380
  ebp: dacadf5c   esp: dacadd48
Nov 29 22:41:53 slump kernel: ds: 0018   es: 0018   ss:
0018
Nov 29 22:41:53 slump kernel: Process rmmod (pid: 31559,
stackpage=dacad000)
Nov 29 22:41:53 slump kernel: Stack: c017afcc 464c457f
00010101 00000000 00000000 00030003 00000001 00000b30
Nov 29 22:41:53 slump kernel:        00000034 464c457f
00010101 00000000 00000000 00030003 00000001 80000b30
Nov 29 22:41:53 slump kernel:        00000034 000125a8
00000000 00200034 00280003 000f0012 41ab8991 41ab8991
Nov 29 22:41:53 slump kernel: Call Trace:    [<c017afcc>]
[<c01388b5>] [<c01388b5>] [<c0136db3>] [<c012bbce>]
Nov 29 22:41:53 slump kernel:   [<c012bf31>] [<c0130a05>]
[<c012bcb0>] [<c0136db3>] [<c012bbce>] [<c012bf31>]
Nov 29 22:41:53 slump kernel:   [<c01161e8>] [<f89bb373>]
[<c016876a>] [<f89bb36d>] [<f89bb36d>] [<f89a69bc>]
Nov 29 22:41:53 slump kernel:   [<c011cc43>] [<f89a3e77>]
[<c011d2b1>] [<c011c536>] [<c010760f>]
Nov 29 22:41:53 slump kernel:
Nov 29 22:41:53 slump kernel: Code: 8b 1b 50 e8 26 7c 83 c7
83 c4 10 39 f3 75 e7 89 77 24 89 77

******Click config***********

ip :: Strip(14)
    -> MarkIPHeader
    -> ipc :: IPClassifier(src net 196.0.0.0/8, dst net
196.0.0.0/8, -);
    dialup :: ipStats;
    lan :: ipStats;
    ipc[0] -> [0]dialup;
    ipc[1] -> [1]dialup;
    dialup -> Discard;
    ipc[2] -> ipc2 :: IPClassifier(src net 10.10.10.0/24,
dst net 10.10.10.0/24, -);
    ipc2[0] -> [0]lan;
    ipc2[1] -> [1]lan;
    lan -> Discard;
    ipc2[2] -> Discard;

unq :: Unqueue;
// Input paths for eth0
c0 :: Classifier(12/0800, -);
fd :: FromDevice(eth0, PROMISC true, BURST 16);
fd -> Queue(5000) -> unq -> c0;
c0[0] -> ip;
c0[1] -> Discard;

td :: ToDevice(eth0);
Idle -> td;
ScheduleInfo(fd 1, td 0.1, ipStats 1, unq 1);

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