============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/0:0/9 is trying to acquire lock:
ffff888103754d58 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0

but task is already holding lock:
ffff888111d82158 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0

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

       CPU0
       ----
  lock(&qdisc_xmit_lock_key#4);
  lock(&qdisc_xmit_lock_key#4);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

locks held by kworker/0:0/9: 15, last CPU#0:
 #0: ffff888175c95940 ((wq_completion)mld){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc900000e7c40 ((work_completion)(&(&idev->mc_ifc_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88810eb45530 (&idev->mc_lock){+.+.}-{4:4}, at: mld_ifc_work+0x2d/0xd60
 #3: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: mld_sendpack+0x206/0xe10
 #4: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: ip6_output+0x11e/0x540
 #5: ffffffff8ed5c740 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x3820
 #6: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: bond_start_xmit+0xb4/0x19e0
 #7: ffffffff8ed5c740 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x3820
 #8: ffff888112efb228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#4){+...}-{3:3}, at: __dev_queue_xmit+0x1143/0x3820
 #9: ffff888111d82158 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0
 #10: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: ip_output+0x5a/0x450
 #11: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x3de/0x10b0
 #12: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x23/0x270
 #13: ffffffff8ed5c740 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x3820
 #14: ffff88811e18b228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#4){+...}-{3:3}, at: __dev_queue_xmit+0x1143/0x3820

stack backtrace:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 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
Workqueue: mld mld_ifc_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_deadlock_bug+0x27a/0x290
 __lock_acquire+0x261c/0x2e50
 lock_acquire+0x115/0x350
 _raw_spin_lock+0x2e/0x40
 sch_direct_xmit+0x15f/0x4c0
 __dev_queue_xmit+0x177f/0x3820
 NF_HOOK+0x33a/0x3c0
 arp_xmit+0x16c/0x270
 arp_solicit+0xbdc/0xe40
 __neigh_event_send+0xf0c/0x1510
 neigh_resolve_output+0x1a1/0x720
 ip_finish_output2+0xc4b/0x10b0
 ip_output+0x29f/0x450
 iptunnel_xmit+0x626/0xd10
 ip_tunnel_xmit+0x195b/0x2040
 erspan_xmit+0xb6a/0x1620
 dev_hard_start_xmit+0x2cd/0x830
 sch_direct_xmit+0x257/0x4c0
 __dev_queue_xmit+0x177f/0x3820
 bond_start_xmit+0x70a/0x19e0
 dev_hard_start_xmit+0x2cd/0x830
 __dev_queue_xmit+0x14c0/0x3820
 ip6_output+0x337/0x540
 NF_HOOK+0x177/0x4f0
 mld_sendpack+0x890/0xe10
 mld_ifc_work+0x842/0xd60
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
