netdevsim netdevsim3 netdevsim2 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0
netdevsim netdevsim3 netdevsim1 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0
======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc6-syzkaller-00135-gcf074eca0065-dirty #0 Not tainted
------------------------------------------------------
syz.3.3776/17914 is trying to acquire lock:
ffff888043180e00 (team->team_lock_key#2){+.+.}-{4:4}, at: team_device_event+0x182/0xa20

but task is already holding lock:
ffff888131750d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x5a1/0x2320

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&dev_instance_lock_key#20){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       __mutex_lock+0x182/0xe80
       dev_set_mtu+0x10e/0x260
       team_add_slave+0x8b8/0x2840
       do_set_master+0x533/0x6d0
       do_setlink+0xcf0/0x41c0
       rtnl_newlink+0x160b/0x1c70
       rtnetlink_rcv_msg+0x7cf/0xb70
       netlink_rcv_skb+0x208/0x470
       netlink_unicast+0x75c/0x8e0
       netlink_sendmsg+0x805/0xb30
       __sock_sendmsg+0x21c/0x270
       ____sys_sendmsg+0x505/0x830
       ___sys_sendmsg+0x21f/0x2a0
       __x64_sys_sendmsg+0x19b/0x260
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (team->team_lock_key#2){+.+.}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       __mutex_lock+0x182/0xe80
       team_device_event+0x182/0xa20
       notifier_call_chain+0x1b6/0x3e0
       dev_close_many+0x29c/0x410
       unregister_netdevice_many_notify+0x619/0x2320
       unregister_netdevice_queue+0x33c/0x380
       nsim_destroy+0x1f6/0x670
       __nsim_dev_port_del+0x14d/0x1b0
       nsim_dev_reload_destroy+0x288/0x490
       nsim_dev_reload_down+0x8a/0xc0
       devlink_reload+0x1b6/0x8d0
       devlink_nl_reload_doit+0xb35/0xd50
       genl_family_rcv_msg_doit+0x215/0x300
       genl_rcv_msg+0x60e/0x790
       netlink_rcv_skb+0x208/0x470
       genl_rcv+0x28/0x40
       netlink_unicast+0x75c/0x8e0
       netlink_sendmsg+0x805/0xb30
       __sock_sendmsg+0x21c/0x270
       ____sys_sendmsg+0x505/0x830
       ___sys_sendmsg+0x21f/0x2a0
       __x64_sys_sendmsg+0x19b/0x260
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dev_instance_lock_key#20);
                               lock(team->team_lock_key#2);
                               lock(&dev_instance_lock_key#20);
  lock(team->team_lock_key#2);

 *** DEADLOCK ***

5 locks held by syz.3.3776/17914:
 #0: ffffffff8f581f30 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffff888134e0d0e8 (&dev->mutex){....}-{4:4}, at: devlink_get_from_attrs_lock+0x240/0x3a0
 #2: ffff888134e0e250 (&devlink->lock_key#4){+.+.}-{4:4}, at: devlink_get_from_attrs_lock+0x24f/0x3a0
 #3: ffffffff8f51bc48 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0xdb/0x670
 #4: ffff888131750d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x5a1/0x2320

stack backtrace:
CPU: 0 UID: 0 PID: 17914 Comm: syz.3.3776 Not tainted 6.16.0-rc6-syzkaller-00135-gcf074eca0065-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 __mutex_lock+0x182/0xe80
 team_device_event+0x182/0xa20
 notifier_call_chain+0x1b6/0x3e0
 dev_close_many+0x29c/0x410
 unregister_netdevice_many_notify+0x619/0x2320
 unregister_netdevice_queue+0x33c/0x380
 nsim_destroy+0x1f6/0x670
 __nsim_dev_port_del+0x14d/0x1b0
 nsim_dev_reload_destroy+0x288/0x490
 nsim_dev_reload_down+0x8a/0xc0
 devlink_reload+0x1b6/0x8d0
 devlink_nl_reload_doit+0xb35/0xd50
 genl_family_rcv_msg_doit+0x215/0x300
 genl_rcv_msg+0x60e/0x790
 netlink_rcv_skb+0x208/0x470
 genl_rcv+0x28/0x40
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f998b58e9a9
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:00007f998c45b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f998b7b5fa0 RCX: 00007f998b58e9a9
RDX: 0000000000000000 RSI: 0000200000000540 RDI: 0000000000000008
RBP: 00007f998b610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f998b7b5fa0 R15: 00007ffc050fac48
 </TASK>
team0: Port device netdevsim0 removed
netdevsim netdevsim3 netdevsim0 (unregistering): unset [0, 0] type 1 family 0 port 8472 - 0
netdevsim netdevsim3 eth0: set [0, 0] type 1 family 0 port 8472 - 0
netdevsim netdevsim3 eth1: set [0, 0] type 1 family 0 port 8472 - 0
netdevsim netdevsim3 eth2: set [0, 0] type 1 family 0 port 8472 - 0
netdevsim netdevsim3 eth3: set [0, 0] type 1 family 0 port 8472 - 0
