bad configuration causes linux to freeze

[532910]

In fact I don't understand what's really wrong, or why host freezes. I was just playing with configuration and found one that made host completely unresponsive: no ping replys, no numlock or keyboard reaction. (I forgot to test magic sysrq.)

mgroup from qemu group 239.255.255.250
mgroup from lan  group 239.255.255.250

mroute from qemu source 192.168.1.6 group 239.255.255.250 to lan
mroute from lan  source 192.168.2.3 group 239.255.255.250 to qemu
mroute from lan1 source 192.168.2.3 group 239.255.255.250 to qemu

lan1 is a phy port bridged with vm in vlan-aware linux bridge

lan is vlan over bridge that represent lan group (in which lan1 is included)
qemu is vlan over bridge that represent qemu group (in which qemu is included)

debian stable, smcroute 2.5.6-1

[troglobit]

Really hard to understand your interface/bridge setup, but I'm quite sure this is not a bug in SMCRoute. More likely that you've managed to create a routing loop instead, I suspect you have some TTL increment hack in your firewall as well, because SSDP (239.255.255.250) usually has a TTL = 1 since it's designed to be LAN only.

[532910]

I only discovered that the TTL needed to be increased after this incident, so it was not enabled at that point.

I will reproduce the freeze on a local device and provide exact steps.

[troglobit]

Any news, or should we just close this?

[532910]

sorry for taking too long to respond, but i promise I will reproduce the freeze, it's in my todo list

[troglobit]

OK, I'll give you another five months.