kauditd_printk_skb: 2 callbacks suppressed audit: type=1804 audit(1615546135.179:131): pid=26873 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4206/bus" dev="sda1" ino=16101 res=1 batman_adv: Cannot find parent device ====================================================== WARNING: possible circular locking dependency detected audit: type=1804 audit(1615546135.209:132): pid=26873 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4206/bus" dev="sda1" ino=16101 res=1 4.14.225-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/26918 is trying to acquire lock: (&xt[i].mutex){+.+.}, at: [] xt_find_revision+0x88/0x200 net/netfilter/x_tables.c:373 but task is already holding lock: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&table[i].mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 nf_tables_netdev_event+0x10d/0x4d0 net/netfilter/nf_tables_netdev.c:122 notifier_call_chain+0x108/0x1a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1667 [inline] call_netdevice_notifiers net/core/dev.c:1683 [inline] rollback_registered_many+0x765/0xba0 net/core/dev.c:7203 unregister_netdevice_many.part.0+0x18/0x2e0 net/core/dev.c:8285 unregister_netdevice_many+0x36/0x50 net/core/dev.c:8284 ip6gre_exit_net+0x41e/0x570 net/ipv6/ip6_gre.c:1212 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #1 (rtnl_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 unregister_netdevice_notifier+0x5e/0x2b0 net/core/dev.c:1630 tee_tg_destroy+0x5c/0xb0 net/netfilter/xt_TEE.c:123 cleanup_entry+0x232/0x310 net/ipv6/netfilter/ip6_tables.c:684 __do_replace+0x38d/0x580 net/ipv6/netfilter/ip6_tables.c:1105 do_replace net/ipv6/netfilter/ip6_tables.c:1161 [inline] do_ip6t_set_ctl+0x256/0x3b0 net/ipv6/netfilter/ip6_tables.c:1685 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x5f/0xb0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt+0xc0/0x120 net/ipv6/ipv6_sockglue.c:937 tcp_setsockopt+0x7b/0xc0 net/ipv4/tcp.c:2828 SYSC_setsockopt net/socket.c:1865 [inline] SyS_setsockopt+0x110/0x1e0 net/socket.c:1844 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&xt[i].mutex){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 xt_find_revision+0x88/0x200 net/netfilter/x_tables.c:373 nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &xt[i].mutex --> rtnl_mutex --> &table[i].mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&table[i].mutex); lock(rtnl_mutex); lock(&table[i].mutex); lock(&xt[i].mutex); *** DEADLOCK *** 1 lock held by syz-executor.3/26918: #0: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] #0: (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_msg+0x726/0xc00 net/netfilter/nfnetlink.c:209 stack backtrace: CPU: 1 PID: 26918 Comm: syz-executor.3 Not tainted 4.14.225-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 xt_find_revision+0x88/0x200 net/netfilter/x_tables.c:373 nfnl_compat_get+0x1f7/0x870 net/netfilter/nft_compat.c:678 nfnetlink_rcv_msg+0x9bb/0xc00 net/netfilter/nfnetlink.c:214 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2433 nfnetlink_rcv+0x1ab/0x1da0 net/netfilter/nfnetlink.c:515 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x62e/0xb80 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465f69 RSP: 002b:00007fd47475f188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd5d97220f R14: 00007fd47475f300 R15: 0000000000022000 batman_adv: Cannot find parent device batman_adv: Cannot find parent device IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready audit: type=1804 audit(1615546136.269:133): pid=26977 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4208/bus" dev="sda1" ino=16257 res=1 bond30: Enslaving gretap1079 as a backup interface with an up link IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond30 (unregistering): Releasing backup interface gretap1079 audit: type=1804 audit(1615546136.849:134): pid=26977 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4208/bus" dev="sda1" ino=16257 res=1 bond30 (unregistering): Released all slaves bond34: Enslaving gretap1325 as a backup interface with an up link bond43: Enslaving gretap1255 as a backup interface with an up link batman_adv: Cannot find parent device bond34 (unregistering): Releasing backup interface gretap1325 bond34 (unregistering): Released all slaves bond43 (unregistering): Releasing backup interface gretap1255 bond43 (unregistering): Released all slaves hpfs: hpfs_map_sector(): read error print_req_error: I/O error, dev loop3, sector 1 Buffer I/O error on dev loop3, logical block 1, async page read hpfs: hpfs_map_sector(): read error bond35: Enslaving gretap1132 as a backup interface with an up link IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond35 (unregistering): Releasing backup interface gretap1132 bond35 (unregistering): Released all slaves bond43: Enslaving gretap1256 as a backup interface with an up link bond34: Enslaving gretap1326 as a backup interface with an up link bond30: Enslaving gretap1080 as a backup interface with an up link bond43 (unregistering): Releasing backup interface gretap1256 bond43 (unregistering): Released all slaves bond34 (unregistering): Releasing backup interface gretap1326 bond34 (unregistering): Released all slaves bond30 (unregistering): Releasing backup interface gretap1080 bond30 (unregistering): Released all slaves IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready audit: type=1804 audit(1615546138.509:135): pid=27594 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4214/memory.events" dev="sda1" ino=16322 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready audit: type=1804 audit(1615546138.649:136): pid=27614 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4215/memory.events" dev="sda1" ino=16322 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond35: Enslaving gretap1133 as a backup interface with an up link audit: type=1804 audit(1615546138.779:137): pid=27626 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4216/memory.events" dev="sda1" ino=16322 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond35 (unregistering): Releasing backup interface gretap1133 bond35 (unregistering): Released all slaves bond34: Enslaving gretap1327 as a backup interface with an up link bond30: Enslaving gretap1081 as a backup interface with an up link bond43: Enslaving gretap1257 as a backup interface with an up link bond34 (unregistering): Releasing backup interface gretap1327 bond34 (unregistering): Released all slaves bond30 (unregistering): Releasing backup interface gretap1081 bond30 (unregistering): Released all slaves bond43 (unregistering): Releasing backup interface gretap1257 bond43 (unregistering): Released all slaves audit: type=1804 audit(1615546139.429:138): pid=27872 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4217/memory.events" dev="sda1" ino=15975 res=1 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready qnx4: no qnx4 filesystem (no root dir). IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready qnx4: no qnx4 filesystem (no root dir). IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: filesystem on './bus' not supported as upperdir IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready audit: type=1804 audit(1615546139.729:139): pid=27927 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4219/bus" dev="sda1" ino=16399 res=1 bond30: Enslaving gretap1082 as a backup interface with an up link bond35: Enslaving gretap1134 as a backup interface with an up link bond34: Enslaving gretap1328 as a backup interface with an up link bond30 (unregistering): Releasing backup interface gretap1082 bond30 (unregistering): Released all slaves bond35 (unregistering): Releasing backup interface gretap1134 bond35 (unregistering): Released all slaves bond43: Enslaving gretap1258 as a backup interface with an up link bond34 (unregistering): Releasing backup interface gretap1328 bond34 (unregistering): Released all slaves bond43 (unregistering): Releasing backup interface gretap1258 bond43 (unregistering): Released all slaves IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready audit: type=1804 audit(1615546140.959:140): pid=28264 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4225/bus" dev="sda1" ino=16070 res=1 omfs: Invalid superblock (0) audit: type=1800 audit(1615546140.959:141): pid=28264 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=16070 res=0 audit: type=1804 audit(1615546140.959:142): pid=28264 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir516045692/syzkaller.wq5YTY/4225/bus" dev="sda1" ino=16070 res=1 audit: type=1800 audit(1615546140.959:143): pid=28264 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=16070 res=0 IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond30: Enslaving gretap1083 as a backup interface with an up link bond35: Enslaving gretap1135 as a backup interface with an up link bond34: Enslaving gretap1329 as a backup interface with an up link bond34 (unregistering): Releasing backup interface gretap1329 bond34 (unregistering): Released all slaves bond43: Enslaving gretap1259 as a backup interface with an up link bond35 (unregistering): Releasing backup interface gretap1135 bond35 (unregistering): Released all slaves bond30 (unregistering): Releasing backup interface gretap1083 bond30 (unregistering): Released all slaves bond43 (unregistering): Releasing backup interface gretap1259 bond43 (unregistering): Released all slaves omfs: Invalid superblock (0) IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready omfs: Invalid superblock (0) IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready omfs: Invalid superblock (0) bond35: Enslaving gretap1136 as a backup interface with an up link IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond35 (unregistering): Releasing backup interface gretap1136 bond35 (unregistering): Released all slaves bond30: Enslaving gretap1084 as a backup interface with an up link bond43: Enslaving gretap1260 as a backup interface with an up link bond30 (unregistering): Releasing backup interface gretap1084 bond30 (unregistering): Released all slaves bond34: Enslaving gretap1330 as a backup interface with an up link bond43 (unregistering): Releasing backup interface gretap1260 bond43 (unregistering): Released all slaves bond34 (unregistering): Releasing backup interface gretap1330 bond34 (unregistering): Released all slaves IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond35: Enslaving gretap1137 as a backup interface with an up link bond43: Enslaving gretap1261 as a backup interface with an up link bond35 (unregistering): Releasing backup interface gretap1137 bond35 (unregistering): Released all slaves bond30: Enslaving gretap1085 as a backup interface with an up link bond34: Enslaving gretap1331 as a backup interface with an up link bond43 (unregistering): Releasing backup interface gretap1261 bond43 (unregistering): Released all slaves bond30 (unregistering): Releasing backup interface gretap1085 bond30 (unregistering): Released all slaves bond34 (unregistering): Releasing backup interface gretap1331 bond34 (unregistering): Released all slaves IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready bond43: Enslaving gretap1262 as a backup interface with an up link bond30: Enslaving gretap1086 as a backup interface with an up link bond43 (unregistering): Releasing backup interface gretap1262 bond43 (unregistering): Released all slaves bond30 (unregistering): Releasing backup interface gretap1086 bond30 (unregistering): Released all slaves bond35: Enslaving gretap1138 as a backup interface with an up link bond34: Enslaving gretap1332 as a backup interface with an up link bond35 (unregistering): Releasing backup interface gretap1138 bond35 (unregistering): Released all slaves bond34 (unregistering): Releasing backup interface gretap1332 bond34 (unregistering): Released all slaves IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready