[Bug 565] New: ROUTE target extension freezes machine with 2.6.20.7

[bugzilla-daemon at bugzilla.netfilter.org]

https://bugzilla.netfilter.org/bugzilla/show_bug.cgi?id=565

           Summary: ROUTE target extension freezes machine with 2.6.20.7
           Product: netfilter/iptables
           Version: patch-o-matic-ng
          Platform: x86_64
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ip_tables (kernel)
        AssignedTo: laforge at netfilter.org
        ReportedBy: guebby at gmail.com


I'm using a patched kernel 2.6.20.7 with IMQ (http://www.linuximq.net) and 
netfilter/ROUTE-target. The machine freezes when the system has to deliver a 
packet that matches a ROUTE-target rule, none problem before. The rule was 
this:

iptables -t mangle -A POSTROUTING -p tcp -d 192.168.0.1 --sport 21 -j 
ROUTE --oif eth1

The system hangs just when I try opening an ftp connection to it, all other 
conections (ssh) stop working and keyboard doesn't respond. Anyway, when I plug 
it, a "AT input keyboard ..." message is showed. There is no kernel panic 
message.

My system is a AMD Athlon 64 X2 3600+, but I don't think it were an 
architecture problem, because I've found a guy with the same problem and has a 
Xeon processor (and of course different motherboard, chipsets...):
http://lists.netfilter.org/pipermail/netfilter-devel/2006-December/026971.html

I've also tried to disable "Dual core" support in BIOS, and when the kernel was 
using only one processor (checked in boot-logs) the problem remained. I forgot 
checking for keyboard plugging message, sorry.

With PREROUTING chain there was no hang, but when I used a x86 machine with 
kernel 2.6.12.3 this rule did nothing with this chain, the same as now.

Thanks for reading.

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