============================================
WARNING: possible recursive locking detected
6.16.0-rc5-syzkaller-00212-g9f735b6f8a77 #0 Not tainted
--------------------------------------------
kworker/u8:1/13 is trying to acquire lock:
ffff888113906218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+...}-{3:3}, at: __dev_queue_xmit+0x2228/0x3a70

but task is already holding lock:
ffff888030de6258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+...}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70

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

       CPU0
       ----
  lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2);
  lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

12 locks held by kworker/u8:1/13:
 #0: ffff888020988948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90000107bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f51bb48 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0
 #3: ffff8880345ff538 (&idev->mc_lock){+.+.}-{4:4}, at: ipv6_mc_dad_complete+0x32/0x4b0
 #4: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: mld_sendpack+0x1de/0xd80
 #5: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #6: ffffffff8e13f1c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #7: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: bond_start_xmit+0x101/0x1a90
 #8: ffffffff8e13f1c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #9: ffff888030de6258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+...}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70
 #10: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x452/0x1160
 #11: ffffffff8e13f1c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70

stack backtrace:
CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.16.0-rc5-syzkaller-00212-g9f735b6f8a77 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_deadlock_bug+0x28b/0x2a0
 validate_chain+0x1a3f/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 _raw_spin_lock+0x2e/0x40
 __dev_queue_xmit+0x2228/0x3a70
 ip_finish_output2+0xd40/0x1160
 iptunnel_xmit+0x571/0xa00
 ip_tunnel_xmit+0x1c3c/0x2380
 gre_tap_xmit+0x590/0x7a0
 dev_hard_start_xmit+0x2d7/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x17b6/0x3a70
 bond_dev_queue_xmit+0x10b/0x1e0
 bond_start_xmit+0xc0a/0x1a90
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1adf/0x3a70
 ip6_finish_output2+0x11bc/0x16a0
 NF_HOOK+0x9e/0x380
 mld_sendpack+0x800/0xd80
 ipv6_mc_dad_complete+0x88/0x4b0
 addrconf_dad_completed+0x6d5/0xd60
 addrconf_dad_work+0xc36/0x14b0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
