[LARTC] Kernel panic with load balancing

[Eduardo Fernández]

Hi!

I've 5 DSL routers and a linux router in a switch. The linux router is
doing NAT for a LAN network, but it freezes when I set up load
balancing with this command:

ip route add default proto static\
        nexthop via 192.168.1.10 dev eth1\
        nexthop via 192.168.1.20 dev eth1\
        nexthop via 192.168.1.30 dev eth1\
        nexthop via 192.168.1.40 dev eth1\
        nexthop via 192.168.1.50 dev eth1

192.168.1.{10,20,30,40,50} are the DSL routers' IPs. Linux router's
kernel is 2.6.15.6 patched with Julian Anastasov's patches
(http://www.ssi.bg/~ja/#routes). I've also tried with other kernel
versions. Kernel panic follows:

CPU: 0
EIP: 0060:[<00000000>] Not tainted VLI
EFLAGS: 00010202       (2.6.15.6)
EIP is at _stext+0x3feffde0/0x1e
eax: d7cd4b00     ebx: c0379280    ecx: 000018ff    edx: c0379280
esi:  00000000     edi:  00000001   ebp:  003b6007 esp: c0341f5c
ds: 007b   es: 007b  ss: 0068
Process swapper (pid: 0, threadinfo=c0340000 task=c02ebb00)
Stack:
c011fb0e d7cd4b00 00000000 c03776e8 0000000a c011fcee c0379280 c03792bc
c0379280 c02f174c c03792b8 c0379240 c0116d7f  00000000 00000001 c0116b6c
c03776e8 00000046 0009f300 c0334800 c0116bd7 0002080b c0104296 c0102e6a
Call trace:
[<c011fb0e>] rcu_do_batch+0x1a/0x59
[<c011fcee>] rcu_process_callbacks+0x28/0x2c
[<c0116d7f>] tasklet_action+0x3a/0x59
[<c0116b6c>] __do_softirq+0x34/0x7d
[<c0116bd7>] do_softirq+0x22/0x26
[<c0104296>] do_IRQ+0x1e/0x24
[<c0102e6a>] common_interrupt+0x1a/0x20
[<c0100a77>] default_idl´+0x2b/0x53
[<c0100af3>] cpu_idle+0x40/0x5c
[<c0342691>] start_kernel+0x13e/0x140
Code: Bad EIP value.
<0> Kernel panic - not syncing:Fatal exception in interrupt

Any ideas? Thank you very much!

Edu