[LARTC] Weird IMQ problem???

["Walter D. Wyndroski" <wdwrn@friendlycity.net>]

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I had IMQ running smoothly for nearly 4 hours, then my linux box started alarming as if the CPU had overheated (which was not the case). The box was completely locked up. I'm not sure if this is an IMQ related problem or what. I'm leaning toward an IMQ problem since I've not had a problem like this before and have been running iproute2/iptables for 8+ months now.

After a hard reboot, I scanned through the messages log and found this error message moments before the crash had occurred.

kernel: KERNEL: assertion (tp->retrans_out == 0) failed at tcp_input.c(1614)


My system specs:
P3 933 mHz
512 MB PC133
RH 9.0
iptables-1.2.8
iproute-2.4.7-7

The following is my IMQ/HTB/SFQ setup:

##Remove ALL tc qdiscs and classes first by deleting root handle
tc qdisc del dev imq0 root > /dev/null 2>&1  #remove any imq qdiscs

##Add HTB Root Handle
tc qdisc add dev imq0 root handle 1: htb default 20

##Add Primary Parent
tc class add dev imq0 parent 1: classid 1:1 htb rate 100mbit ceil 100mbit
##Add Prmary Children
   tc class add dev imq0 parent 1:1 classid 1:10 htb rate 50mbit ceil 50mbit
      tc qdisc add dev imq0 parent 1:10 handle 10: sfq perturb 10
   tc class add dev imq0 parent 1:1 classid 1:20 htb rate 128kbit ceil 128kbit
      tc qdisc add dev imq0 parent 1:20 handle 20: sfq perturb 10

tc filter add dev imq0 parent 1: protocol ip handle 5 fw flowid 1:10


$IPTABLES -A PREROUTING -t mangle --src X.X.X.X/X -j MARK --set-mark 5
$IPTABLES -A PREROUTING -t mangle --dst X.X.X.X/X -j MARK --set-mark 5
$IPTABLES -A PREROUTING -t mangle -j IMQ --todev 0  #Send all packets passing through
$IPTABLES -A POSTROUTING -t mangle -j IMQ --todev 0 #mangle table to IMQ device

Any help would be greatly appreciated. 

Regards,

Walt

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