The initialisation sequence of the fcc ethernet driver contains race condition that will crash the machine when a packet is received in the wrong moment during system boot.
The oops usually shows ip_route_input() as the responsible function, but that is not where things go wrong. The problem is that when fec_enet_init() calls init_fcc_startup() during device setup, fcc_restart() enables the receiver and the device will start to receive packets while the rest of networking is not yet prepared for this -> crash. This situation can easily be created when the system is loaded with a flood ping during boot, it will almost certainly crash (ping the broadcast address on a isolated network to be sure the booting device really gets it's share). The patch moves the calls to fcc_restart() to fcc_enet_open(), so packets will only start to come in when the kernel is ready for it. I'm not 100% about all the implications this could have, but it seems to work fine. -- Stefan Nickl Kontron Modular Computers -------------- next part -------------- A non-text attachment was scrubbed... Name: fcc_enet-startup_race.patch Type: text/x-patch Size: 969 bytes Desc: not available Url : http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20041126/07333e50/attachment.bin
