Hangs with 2.4.20 and POM 20030912

Hi all,

We recently upgraded our firewall kernels (based on 2.4.20 with iptables
patch-o-matic and ebtables, among other patches) from patch-o-matic
20030422 (which was a snapshot that proved very stable) to the latest
release, 20030912. Since then, we have experienced serious problems with
bridging, where the system would hang a few seconds after bringing up 
a bridge device. Normal operation without bridging looks OK.

The nature of the hang made it very difficult to diagnose the problem. It 
seems to be in an interrupt, as reported by LKCD, and we could not get any 
debugging output, not even registers. We haven't managed to produce a 
crash dump yet, but we're working on it.

We were running ebtables-brnf_vs_2.4.21.diff.gz with the arpt_mangle bug 
fix, but even after upgrading to ebtables-brnf-3_vs_2.4.22.diff.gz, we are 
still seeing the same problem. Removing the ebtables patch allows the 
system to boot and run normally.

In order to compile the 2.4.20 kernel with the 2.4.22 patch, we had to
replace net/bridge/br_input.c with the version from 2.4.22, but since we
had same problem before with the 2.4.21 patch, we don't think that's
related.

Does anyone have any ideas what could be causing this, or what we could do 
to assist with diagnosis?

Cheers, Chris.
-- 
   ___ __     _
 / __// / ,__(_)_  | Chris Wilson -- UNIX Firewall Lead Developer |
/ (_ / ,\/ _/ /_ \ | NetServers.co.uk http://www.netservers.co.uk |
\ _//_/_/_//_/___/ | 21 Signet Court, Cambridge, UK. 01223 576516 |



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