======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.10862/29424 is trying to acquire lock:
ffff88801f64c8c0 (&port->pnodes_lock){+.+.}-{4:4}, at: ipvlan_device_event+0x489/0xfb0

but task is already holding lock:
ffff8881be73ce70 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: dev_set_mtu+0xeb/0x210

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&dev_instance_lock_key#3){+.+.}-{4:4}:
       __mutex_lock+0x19d/0x1550
       xsk_bind+0x331/0x1380
       __sys_bind+0x2e3/0x410
       __x64_sys_bind+0x7a/0x90
       do_syscall_64+0x166/0x520
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&xs->mutex){+.+.}-{4:4}:
       __mutex_lock+0x19d/0x1550
       xsk_diag_dump+0x52f/0x1560
       netlink_dump+0x711/0xee0
       __netlink_dump_start+0x589/0x7b0
       xsk_diag_handler_dump+0x1a0/0x250
       sock_diag_rcv_msg+0x4b0/0x5f0
       netlink_rcv_skb+0x226/0x4a0
       netlink_unicast+0x7bd/0x940
       netlink_sendmsg+0x813/0xb40
       sock_sendmsg_nosec+0x13a/0x180
       sock_write_iter+0x2de/0x3e0
       do_iter_readv_writev+0x612/0x8c0
       vfs_writev+0x343/0x990
       do_writev+0x154/0x2e0
       do_syscall_64+0x166/0x520
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&net->xdp.lock){+.+.}-{4:4}:
       __mutex_lock+0x19d/0x1550
       xsk_notifier+0x89/0x230
       notifier_call_chain+0x1a5/0x3d0
       unregister_netdevice_many_notify+0x17f9/0x2140
       ipvlan_device_event+0xf1f/0xfb0
       notifier_call_chain+0x1a5/0x3d0
       unregister_netdevice_many_notify+0x17f9/0x2140
       unregister_netdevice_queue+0x2f5/0x340
       _cfg80211_unregister_wdev+0x156/0x5a0
       ieee80211_if_remove+0x289/0x340
       ieee80211_del_iface+0x19/0x30
       cfg80211_remove_virtual_intf+0x221/0x3f0
       genl_family_rcv_msg_doit+0x233/0x340
       genl_rcv_msg+0x614/0x7a0
       netlink_rcv_skb+0x226/0x4a0
       genl_rcv+0x28/0x40
       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

-> #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
       netif_set_mtu_ext+0x442/0x830
       netif_set_mtu+0xd7/0x1b0
       dev_set_mtu+0x105/0x210
       dev_ioctl+0x7b4/0x1150
       sock_do_ioctl+0x23e/0x320
       sock_ioctl+0x57a/0x7e0
       __se_sys_ioctl+0xfc/0x170
       do_syscall_64+0x166/0x520
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &port->pnodes_lock --> &xs->mutex --> &dev_instance_lock_key#3

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&dev_instance_lock_key#3);
                               lock(&xs->mutex);
                               lock(&dev_instance_lock_key#3);
  lock(&port->pnodes_lock);

 *** DEADLOCK ***

locks held by syz.1.10862/29424: 2, last CPU#0:
 #0: ffffffff902556c0 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x7a4/0x1150
 #1: ffff8881be73ce70 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: dev_set_mtu+0xeb/0x210

stack backtrace:
CPU: 0 UID: 0 PID: 29424 Comm: syz.1.10862 Not tainted syzkaller #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+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
 netif_set_mtu_ext+0x442/0x830
 netif_set_mtu+0xd7/0x1b0
 dev_set_mtu+0x105/0x210
 dev_ioctl+0x7b4/0x1150
 sock_do_ioctl+0x23e/0x320
 sock_ioctl+0x57a/0x7e0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbb859e159
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:00007fdbb940f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdbb8825fa0 RCX: 00007fdbb859e159
RDX: 0000200000000400 RSI: 0000000000008922 RDI: 0000000000000003
RBP: 00007fdbb8635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbb8826038 R14: 00007fdbb8825fa0 R15: 00007ffd3ddf6d78
 </TASK>
