sk_run_filter problem

I'm trying to load the cipcb module into a 2.4 kernel with 
CONFIG_FILTER=y (os=Debian Woody), and I'm runnig into the same 
"unresolved symbol" problem that some people have reported a while back 
on this list and elsewhere.

# modprobe -dv cipcb
=============================================
Module cipcb
kname cipcb
objkey cipcb
names: cipcb
mode: NORMAL
Module matching cipcb: /lib/modules/2.4.28-dmaide/misc/cipcb.o
=============================================
/sbin/insmod /lib/modules/2.4.28-dmaide/misc/cipcb.o
Using /lib/modules/2.4.28-dmaide/misc/cipcb.o
Symbol version prefix ''
/lib/modules/2.4.28-dmaide/misc/cipcb.o: unresolved symbol sk_run_filter
/lib/modules/2.4.28-dmaide/misc/cipcb.o: insmod 
/lib/modules/2.4.28-dmaide/misc/cipcb.o failed
/lib/modules/2.4.28-dmaide/misc/cipcb.o: insmod cipcb failed

The kernel is vanilla 2.4.28 plus a simple unrelated patch that enables 
UltraDMA mode in the SATA driver. You can get the patch from the 
following address:

    http://lkml.org/lkml/2004/9/18/23

With CONFIG_FILTER disabled, the module loads fine. Unfortunately, I 
cannot leave it disabled because I need to run dhcpd on the host.

I don't think the problem is isolated into CIPE itself, because the 
kernel-bundled "pppoe" module shows the same symptoms:

# depmod -ae
depmod: *** Unresolved symbols in 
/lib/modules/2.4.28-dmaide/kernel/drivers/net/pppoe.o
depmod:         sk_run_filter
depmod: *** Unresolved symbols in /lib/modules/2.4.28-dmaide/misc/cipcb.o
depmod:         sk_run_filter

---
 From the little information I have managed to gather from the web, I 
have two hypotheses:

1. Problem with Debian's "modutils" package (too old, too new ;) , too 
different). Most if not all of the people who encountered this were 
using Debian systems.

If this is true, then *why*? I don't like the prospect of grafting a 
custom modutils into a stable system. Could it be fixed with a patch in 
CIPE instead? I simply don't understand why these "unresolved symbol" 
messages occur.

2. Regression in the 2.4.28 kernel or earlier.

Opinions?
Thanks

-- 
Calin


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