32-bit ulogd running on 64-bit kernel writes garbage to syslogemu

[Roman Fiedler]

After upgrading the kernel from 32 to 64 bit WITHOUT upgrading the system to 64 bit, everything worked fine except that the ulogd (1.24-3ubuntu1) messages written to syslogemu were complete garbage, e.g.

Jan 1 00:00:00 localhost 0 0 20 0 1 < IN= [unprintable bytes]
R OUT= [unprintable bytes] MAC=50:54:2d:49:4e:46:4f:00:00:00:00:00:00:00:00:00:00:00:00:0e:00:50:56:9c:3c:a6:00:50:56:9c:00:a2:08:00:34:35:37:36:36:31:32:20:34:32:38:37:38:35:39:38:34:30:20:34:32:38:37:38:35:38:31:30:34:20:34:31:35:31:32 SRC=32.48.32.48 DST=32.49.55.32 LEN=13112 TOS=10 PREC=0x20 TTL=57 ID=12340 MF FRAG:5940 PROTO=53

(I guess, this was a TCP4 SYN)

All other iptables tools seem to work correctly, e.g. iptables-save shows correct interface names, rules and also the ruleset works as expected. From that I would expect, that the error should reside in the netlink handover of captured packets to ulogd or the ulogd handling of those messages.

* I asked about problem on netfilter-devel (upstream), but no replies so far: http://marc.info/?l=netfilter-devel&m=134725936925109&w=2

* Not clear, if 32-bit ulogd can really work on 64-bit kernel

System info:

# lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04

# dpkg --print-architecture
i386

# apt-cache policy ulogd
ulogd:
  Installed: 1.24-3ubuntu1
  Candidate: 1.24-3ubuntu1
  Version table:
 *** 1.24-3ubuntu1 0
        500 http://ubuntu-proxy-ehealth.d03.arc.local/ubuntu/ natty/universe i386 Packages
        100 /var/lib/dpkg/status

# cat /proc/version
Linux version 3.3.2-vs2.3.3.2 (root@v3ls1202) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu4) ) #1 SMP Tue Apr 17 16:37:51 UTC 2012