Is this a bug in Linux sockets? Receiving an extra IP header in a RAW udp socket

I created a RAW socket with the UDP protocol, sent a packet consisting of a UDP header and data, everything is fine in the PP, the packet is correct.

Can SO_RCVTIMEO be used for two recvfrom() calls

I have set up a receive timeout like this:

Can SO_RCVTIMEO be used for two recvfrom() calls

I have set up a receive timeout like this: