============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.3.2961/15077 is trying to acquire lock:
ffff88807813cd00 (team->team_lock_key#4){+.+.}-{3:3}, at: team_port_change_check drivers/net/team/team.c:3027 [inline]
ffff88807813cd00 (team->team_lock_key#4){+.+.}-{3:3}, at: team_device_event+0x1d6/0x9c0 drivers/net/team/team.c:3053

but task is already holding lock:
ffff88807813cd00 (team->team_lock_key#4){+.+.}-{3:3}, at: team_del_slave+0x2d/0x1b0 drivers/net/team/team.c:2016

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

       CPU0
       ----
  lock(team->team_lock_key#4);
  lock(team->team_lock_key#4);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

2 locks held by syz.3.2961/15077:
 #0: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163
 #1: ffff88807813cd00 (team->team_lock_key#4){+.+.}-{3:3}, at: team_del_slave+0x2d/0x1b0 drivers/net/team/team.c:2016

stack backtrace:
CPU: 0 PID: 15077 Comm: syz.3.2961 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 __lock_acquire+0x12c8/0x7c40 kernel/locking/lockdep.c:-1
 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747
 team_port_change_check drivers/net/team/team.c:3027 [inline]
 team_device_event+0x1d6/0x9c0 drivers/net/team/team.c:3053
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 dev_close_many+0x2a2/0x400 net/core/dev.c:1614
 vlan_device_event+0x12b2/0x1e20 net/8021q/vlan.c:476
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 dev_close_many+0x2a2/0x400 net/core/dev.c:1614
 dev_close+0x154/0x210 net/core/dev.c:1636
 team_port_del+0x4ce/0xc30 drivers/net/team/team.c:1375
 team_del_slave+0x38/0x1b0 drivers/net/team/team.c:2017
 do_set_master net/core/rtnetlink.c:2628 [inline]
 do_setlink+0xdf1/0x29c0 net/core/rtnetlink.c:2852
 rtnl_setlink+0x37e/0x510 net/core/rtnetlink.c:3136
 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166
 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fda16d9e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fda17d4e028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fda17025fa0 RCX: 00007fda16d9e0d9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007fda16e35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda17026038 R14: 00007fda17025fa0 R15: 00007ffc3ee5cd58
 </TASK>