kern/121955: [ipfw] [panic] freebsd 7.0 panic with mpd

[Andrey V. Elsukov]

AT Matik wrote:
> what do you mean? By setting to 0 the packages are not re-injected into the 
> pipe but go through other existing rules after the matching pipe, or not?

When you reset net.inet.ip.fw.one_pass to zero, packets return back
into ipfw to the next rule after dummynet/netgraph. And if you have
similar rules packets will be passed into dummynet/netgraph again.

This is example how to get double fault (from mail archive):

ifconfig em0 192.168.0.2/24
kldload ipfw
kldload dummynet
sysctl net.inet.ip.fw.one_pass=0
ipfw pipe 2 config bw 0
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ipfw add 2 pipe 2 ip from any to any
ping 192.168.0.1

-- 
WBR, Andrey V. Elsukov