Problem LOG and ICMP (bug ?)

[dominique1903@netscape.net]

I did a "traceroute" from my firewall (output interface 192.178.71.1) to 192.168.72.2. Here is the related line logged from a rule "-j LOG" :
IN= OUT=eth1 SRC=192.168.71.1 DST=192.168.72.2 LEN=38 TOS=0x00 PREC=0x00 TTL=1 ID=25425 PROTO=UDP SPT=1028 DPT=33435 LEN=18

The nearest router (192.168.71.8) respond an ICMP Excedeed Time to Live:
IN=eth1 OUT= MAC=00:01:02:6c:f2:2b:00:20:d2:17:87:cf:08:00 SRC=192.168.71.8 DST=192.168.71.1 LEN=56 TOS=0x00 PREC=0x00 TTL=32 ID=1 PROTO=ICMP TYPE=11 CODE=0 [SRC=192.168.71.1 DST=192.168.72.2 LEN=38 TOS=0x00 PREC=0x00 TTL=1 ID=25425 PROTO=UDP SPT=0 DPT=501 LEN=41048 ]

BUT the information logged about the related UDP packet is wrong (SPT, DPT..) !! 
Is it normal ? Is it a known problem (bug?) ? Is there any patch ?

Note: I encountred the same problem with many ICMP packets logged (ie. some bizarre info about the related packet: TCP flags...)

Thanks.
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