IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
kasan: GPF could be caused by NULL-ptr deref or user memory access
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
general protection fault: 0000 [#1] PREEMPT SMP KASAN
device veth0_macvtap entered promiscuous mode
Modules linked in:
CPU: 0 PID: 9437 Comm: syz-executor.2 Not tainted 4.14.275-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88804e73e040 task.stack: ffff88804e740000
RIP: 0010:dev_put include/linux/netdevice.h:3381 [inline]
RIP: 0010:llc_ui_autobind.isra.0+0x26b/0x390 net/llc/af_llc.c:320
RSP: 0018:ffff88804e747cc8 EFLAGS: 00010202
IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready
RAX: dffffc0000000000 RBX: ffff8880ac203680 RCX: ffffc90005ffa000
RDX: 00000000000000a8 RSI: ffffffff85d0c563 RDI: 0000000000000540
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
device veth1_macvtap entered promiscuous mode
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88804e747e28 R14: 0000000000000010 R15: ffff88805210b020
FS:  00007f74852c9700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffecf27fff8 CR3: 000000009df75000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 llc_ui_connect+0x4b9/0xab0 net/llc/af_llc.c:500
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
 SYSC_connect net/socket.c:1655 [inline]
 SyS_connect+0x1f4/0x240 net/socket.c:1636
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f74869540e9
RSP: 002b:00007f74852c9168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f7486a66f60 RCX: 00007f74869540e9
RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f74869ae08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc9fbb23af R14: 00007f74852c9300 R15: 0000000000022000
Code: 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
55 ff ff 48 0f 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
ba 73 60 08 45 31 e4 31 ed e8 dd 7c 84 fb 48 8d 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
bd 40 05 00 00 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 00 00 00 48 8b 85 40 05 00 00 65 ff 08 44 
RIP: dev_put include/linux/netdevice.h:3381 [inline] RSP: ffff88804e747cc8
RIP: llc_ui_autobind.isra.0+0x26b/0x390 net/llc/af_llc.c:320 RSP: ffff88804e747cc8
---[ end trace d4e2de04b68d230e ]---
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!