Hi all, We use linux-2.4.20 in one of our products and we've found what looks to be a problem in the bridge module. (I know this is old code but we don't send our customers kernel upgrades unless we really have to!) The problem is that some of our bridges have become orphaned from the bridge module. Specifically ifconfig ourbridgename shows that the device "ourbridgename" is known to the kernel, but brctl show does not list "ourbridgename". I've looked through the bridge module and it seems that the most likely explanation is that bridge_list in br_if.c has become corrupted, causing the bridge called "ourbridgename" to become orphaned. I cannot see how this would happen, however, since bridge_list is only ever referenced under the ioctl_mutex. I should also point out that br_del_bridge() is not called by our application. I noticed that in later kernels the ioctl_mutex has been replaced by the rtnl_lock(). Why was this done? Could this be related to our problem? TIA, Alex