I was trying various virtual network settings and the um_eth_net_util
deamon crashed (sorry, no backtrace).
Then uml kernel started to print an endless number of messages:
Failed to forward 15 to pid 16049, errno = 9
When I restarted the deamon, uml printed the following:
Registering fd 15 twice
Irqs : 4, 4
Ids : 0x5005cc00, 0x5005cc00
Perhaps it would be a good idea to improve the error recovery of uml.
When the um_eth_net_util deamon stops, it could print "connection with
um_eth_net_util deamon lost" and behave as if one had pulled the RJ45