[Qemu-discuss] Packet corrupts to guest system system from host kernel 4.16.x

[Алексей Болдырев]

Why, when using the 4.16 kernel on the host system, is there such a strange 
behavior of virtual machines? What is the problem? He rolled back to 4.9.c - 
the problem was gone.

tcpdump on router:
tcpdump: listening on vlan-00110013, link-type EN10MB (Ethernet), capture size 
262144 bytes
23:59:08.331875 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype ARP (0x0806), 
length 38: [|ARP]
        0x0000:  0001 0800 0604 0001 5254 0038 cf94 c0a8  ........RT.8....
        0x0010:  b402 0000 0000 0000                      ........
23:59:08.454364 52:54:00:4e:9c:5f > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), 
length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.180.2 tell 
192.168.180.1, length 28
23:59:08.454754 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype ARP (0x0806), 
length 38: [|ARP]
        0x0000:  0001 0800 0604 0002 5254 0038 cf94 c0a8  ........RT.8....
        0x0010:  b402 5254 004e 9c5f                      ..RT.N._
23:59:09.462383 52:54:00:4e:9c:5f > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), 
length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.180.2 tell 
192.168.180.1, length 28
23:59:09.463607 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype ARP (0x0806), 
length 38: [|ARP]
        0x0000:  0001 0800 0604 0002 5254 0038 cf94 c0a8  ........RT.8....
        0x0010:  b402 5254 004e 9c5f                      ..RT.N._
23:59:10.486352 52:54:00:4e:9c:5f > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), 
length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.180.2 tell 
192.168.180.1, length 28
23:59:10.487303 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype ARP (0x0806), 
length 38: [|ARP]
        0x0000:  0001 0800 0604 0002 5254 0038 cf94 c0a8  ........RT.8....
        0x0010:  b402 5254 004e 9c5f                      ..RT.N._
23:59:11.051570 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype IPv4 (0x0800), 
length 77: truncated-ip - 4 bytes missing! (tos 0x0, ttl 64, id 54539, offset 
0, flags [DF], proto UDP (17), length 67)
    192.168.180.2.59917 > 198.18.120.1.53: 1196+[|domain]
23:59:11.051585 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype IPv4 (0x0800), 
length 77: truncated-ip - 4 bytes missing! (tos 0x0, ttl 64, id 54540, offset 
0, flags [DF], proto UDP (17), length 67)
    192.168.180.2.59917 > 198.18.120.1.53: 5849+[|domain]
23:59:11.527109 52:54:00:4e:9c:5f > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), 
length 42: Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.180.2 tell 
192.168.180.1, length 28
23:59:11.527707 52:54:00:38:cf:94 > 52:54:00:4e:9c:5f, ethertype ARP (0x0806), 
length 38: [|ARP]
        0x0000:  0001 0800 0604 0002 5254 0038 cf94 c0a8  ........RT.8....
        0x0010:  b402 5254 004e 9c5f                      ..RT.N._
^C
11 packets captured
11 packets received by filter
0 packets dropped by kernel