IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready ------------[ cut here ]------------ batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 gretap0: caps=(0x00000000401d7869, 0x0000000000000000) len=1053 data_len=877 gso_size=1024 gso_type=131072 ip_summed=0 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! WARNING: CPU: 1 PID: 7600 at net/core/dev.c:2879 skb_warn_bad_offload+0x266/0x5d0 net/core/dev.c:2874 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 Kernel panic - not syncing: panic_on_warn set ... batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! CPU: 1 PID: 7600 Comm: syz-executor.1 Not tainted 4.20.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x16b/0x224 lib/dump_stack.c:113 panic+0x212/0x3b7 kernel/panic.c:188 __warn.cold.8+0x1b/0x3c kernel/panic.c:540 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:skb_warn_bad_offload+0x266/0x5d0 net/core/dev.c:2874 Code: 00 48 8d 88 28 03 00 00 48 85 c0 48 c7 c0 c0 f7 be 87 48 0f 44 c8 41 56 48 c7 c7 40 cd be 87 56 4c 89 fe 41 55 e8 4d 2a d1 fb <0f> 0b 48 83 c4 18 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 RSP: 0018:ffff8800aeb078d8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88007f14d500 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffff8800a63e88e8 RDI: ffffffff8a14fca0 RBP: ffff8800aeb07928 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88008e186e40 R13: 0000000000000400 R14: 0000000000000000 R15: ffff88008e186e40 __skb_gso_segment+0x491/0x670 net/core/dev.c:3086 udp_rcv_segment include/net/udp.h:479 [inline] udp_queue_rcv_skb+0x205/0x8b0 net/ipv4/udp.c:2022 __udp4_lib_mcast_deliver net/ipv4/udp.c:2109 [inline] __udp4_lib_rcv+0x187f/0x2e00 net/ipv4/udp.c:2240 udp_rcv+0x15/0x20 net/ipv4/udp.c:2415 ip_protocol_deliver_rcu+0x5a/0x700 net/ipv4/ip_input.c:208 ip_local_deliver_finish+0x1fb/0x2f0 net/ipv4/ip_input.c:234 NF_HOOK include/linux/netfilter.h:289 [inline] ip_local_deliver+0x2f7/0x440 net/ipv4/ip_input.c:255 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0x162/0x250 net/ipv4/ip_input.c:414 NF_HOOK include/linux/netfilter.h:289 [inline] ip_rcv+0xcb/0x2e0 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core+0xe9/0x170 net/core/dev.c:4941 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5051 process_backlog+0x1fc/0x700 net/core/dev.c:5855 napi_poll net/core/dev.c:6275 [inline] net_rx_action+0x45c/0xe50 net/core/dev.c:6341 __do_softirq+0x25e/0x987 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1023 do_softirq.part.14+0x126/0x160 kernel/softirq.c:337 do_softirq+0x19/0x20 kernel/softirq.c:340 netif_rx_ni+0x15f/0x240 net/core/dev.c:4538 dev_loopback_xmit+0x260/0x5f0 net/core/dev.c:3550 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 ip_mc_finish_output+0x2b/0x150 net/ipv4/ip_output.c:331 NF_HOOK include/linux/netfilter.h:289 [inline] ip_mc_output+0x4d0/0xca0 net/ipv4/ip_output.c:369 dst_output include/net/dst.h:444 [inline] ip_local_out+0x78/0x130 net/ipv4/ip_output.c:124 ip_send_skb+0x36/0xa0 net/ipv4/ip_output.c:1441 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! udp_send_skb.isra.43+0x5d4/0x1500 net/ipv4/udp.c:827 udp_sendmsg+0x177a/0x22c0 net/ipv4/udp.c:1114 udpv6_sendmsg+0x5e0/0x2fe0 net/ipv6/udp.c:1231 inet_sendmsg+0x108/0x440 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:631 __sys_sendto+0x1f2/0x2e0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1796 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f791e560c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f791e5616d4 RCX: 000000000045b349 RDX: 0000000000000401 RSI: 0000000020000600 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 00000000200011c0 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009a9 R14: 00000000004cb1e8 R15: 000000000075bf2c Kernel Offset: disabled Rebooting in 86400 seconds..