8021q: adding VLAN 0 to HW filter on device netdevsim1
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.6.16482/11570 is trying to acquire lock:
ffff8881a696c8c0 (&port->pnodes_lock){+.+.}-{4:4}, at: ipvlan_device_event+0x489/0xfb0

but task is already holding lock:
ffff88810cf58e70 (&dev_instance_lock_key#2){+.+.}-{4:4}, at: xdp_set_features_flag+0x34/0x2a0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&dev_instance_lock_key#2){+.+.}-{4:4}:
       __mutex_lock+0x19d/0x1550
       ipvlan_uninit+0x147/0x290
       unregister_netdevice_many_notify+0x1acd/0x2140
       ipvlan_device_event+0xf1f/0xfb0
       notifier_call_chain+0x1a5/0x3d0
       unregister_netdevice_many_notify+0x17f9/0x2140
       ops_undo_list+0x391/0x8d0
       cleanup_net+0x572/0x810
       process_scheduled_works+0xc3d/0x1630
       worker_thread+0xa47/0xfb0
       kthread+0x38b/0x480
       ret_from_fork+0x514/0xb70
       ret_from_fork_asm+0x1a/0x30

-> #0 (&port->pnodes_lock){+.+.}-{4:4}:
       __lock_acquire+0x15ff/0x2e50
       lock_acquire+0x115/0x350
       __mutex_lock+0x19d/0x1550
       ipvlan_device_event+0x489/0xfb0
       notifier_call_chain+0x1a5/0x3d0
       call_netdevice_notifiers+0x90/0xd0
       xdp_set_features_flag+0x1a0/0x2a0
       bond_xdp_set_features+0x277/0x320
       bond_enslave+0x2c78/0x3b10
       do_set_master+0x563/0x720
       do_setlink+0xe7b/0x4670
       rtnl_newlink+0x15a3/0x1c30
       rtnetlink_rcv_msg+0x802/0xc00
       netlink_rcv_skb+0x226/0x4a0
       netlink_unicast+0x7bd/0x940
       netlink_sendmsg+0x813/0xb40
       sock_sendmsg_nosec+0x13a/0x180
       ____sys_sendmsg+0x54e/0x850
       ___sys_sendmsg+0x2a5/0x360
       __x64_sys_sendmsg+0x1b1/0x290
       do_syscall_64+0x166/0x520
       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#2);
                               lock(&port->pnodes_lock);
                               lock(&dev_instance_lock_key#2);
  lock(&port->pnodes_lock);

 *** DEADLOCK ***

locks held by syz.6.16482/11570: 2, last CPU#0:
 #0: ffffffff90250d80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xc10/0x1c30
 #1: ffff88810cf58e70 (&dev_instance_lock_key#2){+.+.}-{4:4}, at: xdp_set_features_flag+0x34/0x2a0

stack backtrace:
CPU: 0 UID: 0 PID: 11570 Comm: syz.6.16482 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xe8/0x150
 print_circular_bug+0x2e2/0x300
 check_noncircular+0x12f/0x150
 __lock_acquire+0x15ff/0x2e50
 lock_acquire+0x115/0x350
 __mutex_lock+0x19d/0x1550
 ipvlan_device_event+0x489/0xfb0
 notifier_call_chain+0x1a5/0x3d0
 call_netdevice_notifiers+0x90/0xd0
 xdp_set_features_flag+0x1a0/0x2a0
 bond_xdp_set_features+0x277/0x320
 bond_enslave+0x2c78/0x3b10
 do_set_master+0x563/0x720
 do_setlink+0xe7b/0x4670
 rtnl_newlink+0x15a3/0x1c30
 rtnetlink_rcv_msg+0x802/0xc00
 netlink_rcv_skb+0x226/0x4a0
 netlink_unicast+0x7bd/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1b1/0x290
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31b779e159
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:00007f31b86fd028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f31b7a26090 RCX: 00007f31b779e159
RDX: 0000000000000040 RSI: 0000200000000380 RDI: 0000000000000006
RBP: 00007f31b783506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31b7a26128 R14: 00007f31b7a26090 R15: 00007ffc06610c28
 </TASK>
bond0: (slave netdevsim1): Enslaving as an active interface with an up link
