batman_adv: batadv0: Removing interface: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_1
======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc3-syzkaller-00159-g223e2288f4b8-dirty #0 Not tainted
------------------------------------------------------
kworker/u8:3/5838 is trying to acquire lock:
ffff888037cc8e00 (team->team_lock_key#2){+.+.}-{4:4}, at: team_device_event+0x182/0xa20

but task is already holding lock:
ffff888037d1ad30 (&dev_instance_lock_key#3){+.+.}-{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#3){+.+.}-{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+0x75b/0x8d0
       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
       default_device_exit_batch+0x819/0x890
       ops_undo_list+0x525/0x990
       cleanup_net+0x4c5/0x800
       process_scheduled_works+0xae1/0x17b0
       worker_thread+0x8a0/0xda0
       kthread+0x711/0x8a0
       ret_from_fork+0x3fc/0x770
       ret_from_fork_asm+0x1a/0x30

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dev_instance_lock_key#3);
                               lock(team->team_lock_key#2);
                               lock(&dev_instance_lock_key#3);
  lock(team->team_lock_key#2);

 *** DEADLOCK ***

5 locks held by kworker/u8:3/5838:
 #0: ffff88801b2f6948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004857bc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f5033d0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffffffff8f50ffc8 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xdc/0x890
 #4: ffff888037d1ad30 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x5a1/0x2320

stack backtrace:
CPU: 0 UID: 0 PID: 5838 Comm: kworker/u8:3 Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: netns cleanup_net
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
 default_device_exit_batch+0x819/0x890
 ops_undo_list+0x525/0x990
 cleanup_net+0x4c5/0x800
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
team0 (unregistering): Port device team_slave_1 removed
team0 (unregistering): Port device team_slave_0 removed
team0 (unregistering): Port device dummy0 removed
bridge_slave_0: left promiscuous mode
bridge0: port 1(bridge_slave_0) entered disabled state
bond3 (unregistering): (slave ip6gretap2): Releasing active interface
bond2 (unregistering): (slave bridge2): Releasing active interface
bond0 (unregistering): (slave bond_slave_0): Releasing backup interface
bond0 (unregistering): (slave bond_slave_1): Releasing backup interface
bond0 (unregistering): (slave bridge_slave_1): Releasing backup interface
bond0 (unregistering): Released all slaves
bond1 (unregistering): Released all slaves
bond2 (unregistering): Released all slaves
bond3 (unregistering): Released all slaves
tipc: Left network mode
hsr_slave_0: left promiscuous mode
hsr_slave_1: left promiscuous mode
batman_adv: batadv0: Removing interface: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_1
pim6reg9 (unregistering): left allmulticast mode
IPVS: stop unused estimator thread 0...
