Packet receive errors?
“packet receive errors” usually means:
1) data is truncated, error in checksum while copying
2) udp queue is full, so it needs to be dropped
3) unable to receive udp package from encapsulated socket
4) sock_queue_rcv_skb() failed with -ENOMEM
5) it is a short packet
6) no space for header in udp packet when validating packet
7) xfrm6_policy_check() fails
many times it means the checksum is not right.
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