validate_nla: 6 callbacks suppressed
netlink: 'syz.3.790': attribute type 10 has an invalid length.
dummy0: left allmulticast mode
dummy0: entered allmulticast mode
dummy0: entered promiscuous mode
============================================
WARNING: possible recursive locking detected
6.12.0-rc7-syzkaller-01770-gdd7207838d38 #0 Not tainted
--------------------------------------------
syz.3.790/8776 is trying to acquire lock:
ffff888011a2ce00 (team->team_lock_key#2){+.+.}-{3:3}, at: team_port_change_check+0x51/0x1e0 drivers/net/team/team_core.c:2949

but task is already holding lock:
ffff888011a2ce00 (team->team_lock_key#2){+.+.}-{3:3}, at: team_add_slave+0xad/0x2760 drivers/net/team/team_core.c:1974

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(team->team_lock_key#2);
  lock(team->team_lock_key#2);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by syz.3.790/8776:
 #0: ffffffff8fcd5448 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fcd5448 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline]
 #0: ffffffff8fcd5448 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_newlink+0xd04/0x24f0 net/core/rtnetlink.c:4000
 #1: ffff888011a2ce00 (team->team_lock_key#2){+.+.}-{3:3}, at: team_add_slave+0xad/0x2760 drivers/net/team/team_core.c:1974

stack backtrace:
CPU: 0 UID: 0 PID: 8776 Comm: syz.3.790 Not tainted 6.12.0-rc7-syzkaller-01770-gdd7207838d38 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 team_port_change_check+0x51/0x1e0 drivers/net/team/team_core.c:2949
 team_device_event+0x4e6/0x5b0 drivers/net/team/team_core.c:2972
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 __dev_notify_flags+0x207/0x400
 dev_change_flags+0xf0/0x1a0 net/core/dev.c:9020
 vlan_device_event+0x1b81/0x1de0 net/8021q/vlan.c:468
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
 call_netdevice_notifiers net/core/dev.c:2048 [inline]
 dev_open+0x13a/0x1b0 net/core/dev.c:1517
 team_port_add drivers/net/team/team_core.c:1216 [inline]
 team_add_slave+0x9c8/0x2760 drivers/net/team/team_core.c:1975
 do_set_master net/core/rtnetlink.c:2911 [inline]
 do_setlink+0xe40/0x4210 net/core/rtnetlink.c:3110
 rtnl_changelink net/core/rtnetlink.c:3717 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3869 [inline]
 rtnl_newlink+0x171c/0x24f0 net/core/rtnetlink.c:4001
 rtnetlink_rcv_msg+0x791/0xcf0 net/core/rtnetlink.c:6911
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2536
 netlink_unicast_kernel net/netlink/af_netlink.c:1316 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1342
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1886
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:744
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2609
 ___sys_sendmsg net/socket.c:2663 [inline]
 __sys_sendmsg+0x292/0x380 net/socket.c:2692
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94b577e819
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f94b665f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f94b5935fa0 RCX: 00007f94b577e819
RDX: 0000000000000000 RSI: 0000000020000600 RDI: 000000000000000e
RBP: 00007f94b57f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f94b5935fa0 R15: 00007ffdabc32208
 </TASK>