IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready device team1 entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macvtap1: link is not ready 8021q: adding VLAN 0 to HW filter on device macvtap1 ============================================ WARNING: possible recursive locking detected 4.19.142-syzkaller #0 Not tainted -------------------------------------------- syz-executor185/6487 is trying to acquire lock: 000000001de11139 (&team->lock){+.+.}, at: team_vlan_rx_add_vid+0x38/0x1e0 drivers/net/team/team.c:1896 but task is already holding lock: 00000000c5ea76c1 (&team->lock){+.+.}, at: team_add_slave+0x98/0x1eb0 drivers/net/team/team.c:1975 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&team->lock); lock(&team->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor185/6487: #0: 0000000040c831f1 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 0000000040c831f1 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4775 #1: 00000000c5ea76c1 (&team->lock){+.+.}, at: team_add_slave+0x98/0x1eb0 drivers/net/team/team.c:1975 stack backtrace: CPU: 0 PID: 6487 Comm: syz-executor185 Not tainted 4.19.142-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+0x1fc/0x2fe lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:1763 [inline] check_deadlock kernel/locking/lockdep.c:1807 [inline] validate_chain kernel/locking/lockdep.c:2403 [inline] __lock_acquire.cold+0x121/0x57e kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 team_vlan_rx_add_vid+0x38/0x1e0 drivers/net/team/team.c:1896 vlan_add_rx_filter_info+0x13c/0x1c0 net/8021q/vlan_core.c:210 __vlan_vid_add net/8021q/vlan_core.c:278 [inline] vlan_vid_add+0x3ee/0x7e0 net/8021q/vlan_core.c:308 vlan_add_rx_filter_info+0x13c/0x1c0 net/8021q/vlan_core.c:210 __vlan_vid_add net/8021q/vlan_core.c:278 [inline] vlan_vid_add+0x3ee/0x7e0 net/8021q/vlan_core.c:308 vlan_device_event.cold+0x28/0x2d net/8021q/vlan.c:381 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 call_netdevice_notifiers net/core/dev.c:1762 [inline] dev_open net/core/dev.c:1442 [inline] dev_open+0x128/0x140 net/core/dev.c:1430 team_port_add drivers/net/team/team.c:1220 [inline] team_add_slave+0xa3c/0x1eb0 drivers/net/team/team.c:1976 do_set_master+0x1c8/0x220 net/core/rtnetlink.c:2321 rtnl_newlink+0x1270/0x15b0 net/core/rtnetlink.c:3170 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x443759 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffef647faa8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000443759 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 000000306d616574 R08: 0000000001bbbbbb R09: 0000000001bbbbbb R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007ffef647fac0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 team0: Device macvtap1 failed to register rx_handler