IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready kasan: CONFIG_KASAN_INLINE enabled IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 6564 Comm: syz-executor.2 Not tainted 4.19.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:strlen+0x1f/0xa0 lib/string.c:482 Code: ff ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 48 89 e5 48 c1 ea 03 41 54 49 89 fc 53 48 83 ec 08 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 4d 41 80 3c 24 IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready RSP: 0018:ffff88008d86ef50 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: ffff88008b5a2518 RCX: dffffc0000000000 RDX: 0000000000000022 RSI: ffff88008b5a2518 RDI: 0000000000000114 RBP: ffff88008d86ef68 R08: ffff88008bd78200 R09: 0000000000000000 R10: ffff88008c1f0172 R11: ffff88008b5a2500 R12: 0000000000000114 R13: ffff88008c1f0100 R14: dffffc0000000000 R15: ffff88008d86f120 FS: 00007f2c5fe59700(0000) GS:ffff8800aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffb6a10e10 CR3: 00000000a97e3000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: strlen include/linux/string.h:267 [inline] ip_set_comment_free+0x5b/0xc0 include/linux/netfilter/ipset/ip_set_comment.h:70 IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready ip_set_ext_destroy include/linux/netfilter/ipset/ip_set.h:276 [inline] hash_net4_add+0x163d/0x27e7 net/netfilter/ipset/ip_set_hash_gen.h:770 hash_net4_uadt+0x4bc/0x7a0 net/netfilter/ipset/ip_set_hash_net.c:199 call_ad+0x178/0x530 net/netfilter/ipset/ip_set_core.c:1515 IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready ip_set_uadd+0x403/0xae0 net/netfilter/ipset/ip_set_core.c:1596 IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready nfnetlink_rcv_msg+0x942/0xc10 net/netfilter/nfnetlink.c:228 IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready device veth0_macvtap entered promiscuous mode netlink_rcv_skb+0x142/0x390 net/netlink/af_netlink.c:2476 nfnetlink_rcv+0x163/0x3b0 net/netfilter/nfnetlink.c:560 IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x443/0x650 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x765/0xc40 net/netlink/af_netlink.c:1917 device veth1_macvtap entered promiscuous mode sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:631 ___sys_sendmsg+0x647/0x950 net/socket.c:2116 IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready __sys_sendmsg+0xd9/0x180 net/socket.c:2154 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 __do_sys_sendmsg net/socket.c:2163 [inline] __se_sys_sendmsg net/socket.c:2161 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2161 do_syscall_64+0xd0/0x4d0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! 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:00007f2c5fe58c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2c5fe596d4 RCX: 000000000045b349 RDX: 0000000000000000 RSI: 0000000020000d00 RDI: 0000000000000004 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008dd R14: 00000000004ca2f8 R15: 000000000075bf2c Modules linked in: ---[ end trace 692101b029dac11e ]--- batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! RIP: 0010:strlen+0x1f/0xa0 lib/string.c:482 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready Code: ff ff ff 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 fa 48 89 e5 48 c1 ea 03 41 54 49 89 fc 53 48 83 ec 08 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 04 84 c0 75 4d 41 80 3c 24 RSP: 0018:ffff88008d86ef50 EFLAGS: 00010286 batman_adv: batadv0: Interface activated: batadv_slave_0 RAX: dffffc0000000000 RBX: ffff88008b5a2518 RCX: dffffc0000000000 RDX: 0000000000000022 RSI: ffff88008b5a2518 RDI: 0000000000000114 RBP: ffff88008d86ef68 R08: ffff88008bd78200 R09: 0000000000000000 R10: ffff88008c1f0172 R11: ffff88008b5a2500 R12: 0000000000000114 R13: ffff88008c1f0100 R14: dffffc0000000000 R15: ffff88008d86f120 FS: 00007f2c5fe59700(0000) GS:ffff8800aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffb6a10e10 CR3: 00000000a97e3000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400