============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/0:9/6315 is trying to acquire lock:
ffff88816bd5e958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0

but task is already holding lock:
ffff8881b1652558 (&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

15 locks held by kworker/0:9/6315:
 #0: ffff8881747a0540 ((wq_completion)mld){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90007567c40 ((work_completion)(&(&idev->mc_ifc_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff8881b9ad8530 (&idev->mc_lock){+.+.}-{4:4}, at: mld_ifc_work+0x2d/0xe70
 #3: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: mld_sendpack+0x213/0xe40
 #4: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: ip6_output+0x126/0x550
 #5: ffffffff8e95cdc0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2b6/0x3950
 #6: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: bond_start_xmit+0xb4/0x1900
 #7: ffffffff8e95cdc0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2b6/0x3950
 #8: ffff888168dbf228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: __dev_queue_xmit+0x11a6/0x3950
 #9: ffff8881b1652558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0
 #10: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: ip_output+0x5b/0x450
 #11: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x3c2/0x1070
 #12: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x23/0x270
 #13: ffffffff8e95cdc0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2b6/0x3950
 #14: ffff888116a90228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: __dev_queue_xmit+0x11a6/0x3950

stack backtrace:
CPU: 0 UID: 0 PID: 6315 Comm: kworker/0:9 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+0x279/0x290
 __lock_acquire+0x253f/0x2cf0
 lock_acquire+0x106/0x350
 _raw_spin_lock+0x2e/0x40
 sch_direct_xmit+0x15f/0x4c0
 __dev_queue_xmit+0x180f/0x3950
 NF_HOOK+0x33a/0x3c0
 arp_xmit+0x16c/0x270
 arp_solicit+0xbe0/0xe40
 __neigh_event_send+0xf05/0x14d0
 neigh_resolve_output+0x198/0x750
 ip_finish_output2+0xca9/0x1070
 ip_output+0x29f/0x450
 iptunnel_xmit+0x621/0xd10
 ip_tunnel_xmit+0x193a/0x1f20
 __gre_xmit+0x19e/0x240
 erspan_xmit+0xa41/0x14d0
 dev_hard_start_xmit+0x2cd/0x830
 sch_direct_xmit+0x251/0x4c0
 __dev_queue_xmit+0x180f/0x3950
 bond_start_xmit+0x766/0x1900
 dev_hard_start_xmit+0x2cd/0x830
 __dev_queue_xmit+0x14d9/0x3950
 ip6_output+0x340/0x550
 NF_HOOK+0x177/0x4f0
 mld_sendpack+0x8b4/0xe40
 mld_ifc_work+0x835/0xe70
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
