netlink: 'syz-executor.0': attribute type 10 has an invalid length. team0: Port device vlan0 added netlink: 'syz-executor.0': attribute type 10 has an invalid length. veth0_vlan: left promiscuous mode veth0_vlan: entered promiscuous mode ============================================ WARNING: possible recursive locking detected 6.9.0-rc6-syzkaller-00022-g98369dccd2f8 #0 Not tainted -------------------------------------------- syz-executor.0/5478 is trying to acquire lock: ffff888021ad4d20 (team->team_lock_key){+.+.}-{3:3}, at: team_port_change_check+0x51/0x1e0 drivers/net/team/team.c:2995 but task is already holding lock: ffff888021ad4d20 (team->team_lock_key){+.+.}-{3:3}, at: team_add_slave+0xa9/0x2740 drivers/net/team/team.c:1973 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(team->team_lock_key); lock(team->team_lock_key); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.0/5478: #0: ffffffff8ef20a48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8ef20a48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x83e/0x10d0 net/core/rtnetlink.c:6592 #1: ffff888021ad4d20 (team->team_lock_key){+.+.}-{3:3}, at: team_add_slave+0xa9/0x2740 drivers/net/team/team.c:1973 stack backtrace: CPU: 0 PID: 5478 Comm: syz-executor.0 Not tainted 6.9.0-rc6-syzkaller-00022-g98369dccd2f8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x23d/0x360 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x6a95/0x7fa0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e9/0x540 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x132/0xd60 kernel/locking/mutex.c:752 team_port_change_check+0x51/0x1e0 drivers/net/team/team.c:2995 team_device_event+0x4e2/0x5b0 drivers/net/team/team.c:3018 notifier_call_chain+0x19f/0x3d0 kernel/notifier.c:93 __dev_notify_flags+0x203/0x400 dev_change_flags+0xec/0x1a0 net/core/dev.c:8769 vlan_device_event+0x1b7d/0x1de0 net/8021q/vlan.c:468 notifier_call_chain+0x19f/0x3d0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] dev_open+0x136/0x1b0 net/core/dev.c:1471 team_port_add drivers/net/team/team.c:1214 [inline] team_add_slave+0x9af/0x2740 drivers/net/team/team.c:1974 do_set_master net/core/rtnetlink.c:2685 [inline] do_setlink+0xe6c/0x41e0 net/core/rtnetlink.c:2891 __rtnl_newlink net/core/rtnetlink.c:3680 [inline] rtnl_newlink+0x1805/0x2090 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x897/0x10d0 net/core/rtnetlink.c:6595 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2559 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x7e6/0x980 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8dd/0xcb0 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x521/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2ac/0x3a0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fcf9ec7dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcf9f8fe0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fcf9edabf80 RCX: 00007fcf9ec7dda9 RDX: 0000000000000000 RSI: 0000000020000600 RDI: 0000000000000004 RBP: 00007fcf9ecca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fcf9edabf80 R15: 00007ffc4096c7f8