============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
kworker/u8:2/5822 is trying to acquire lock:
ffff88810a316d58 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0

but task is already holding lock:
ffff888171626158 (&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

9 locks held by kworker/u8:2/5822:
 #0: ffff8881741b3948 ((wq_completion)bond19){+.+.}-{0:0}, at: process_scheduled_works+0x9ea/0x1830
 #1: ffffc900061cfc40 ((work_completion)(&(&bond->alb_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa25/0x1830
 #2: ffffffff8e760320 (rcu_read_lock){....}-{1:3}, at: bond_alb_monitor+0xf8/0x17e0
 #3: ffffffff8e760380 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x274/0x38a0
 #4: ffff88816f7e6228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#4){+...}-{3:3}, at: __dev_queue_xmit+0x1002/0x38a0
 #5: ffff888171626158 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0
 #6: ffffffff8e760320 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x3c2/0x1070
 #7: ffffffff8e760380 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x274/0x38a0
 #8: ffff888172915228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#4){+...}-{3:3}, at: __dev_queue_xmit+0x1002/0x38a0

stack backtrace:
CPU: 1 UID: 0 PID: 5822 Comm: kworker/u8:2 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: bond19 bond_alb_monitor
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_deadlock_bug+0x279/0x290
 __lock_acquire+0x253f/0x2cf0
 lock_acquire+0xf0/0x2e0
 _raw_spin_lock+0x2e/0x40
 sch_direct_xmit+0x15f/0x4c0
 __dev_queue_xmit+0x1538/0x38a0
 ip_finish_output2+0xca9/0x1070
 iptunnel_xmit+0x59f/0xa00
 ip_tunnel_xmit+0x193a/0x1f20
 __gre_xmit+0x19e/0x240
 erspan_xmit+0xa81/0x1670
 dev_hard_start_xmit+0x2d8/0x870
 sch_direct_xmit+0x251/0x4c0
 __dev_queue_xmit+0x1538/0x38a0
 alb_send_lp_vid+0x348/0x550
 alb_send_learning_packets+0x12c/0x300
 bond_alb_monitor+0x3d5/0x17e0
 process_scheduled_works+0xb02/0x1830
 worker_thread+0xa50/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
