============================================
WARNING: possible recursive locking detected
6.16.0-rc6-syzkaller-00135-gcf074eca0065 #0 Not tainted
--------------------------------------------
syz.2.417/7647 is trying to acquire lock:
ffff888028025958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x153/0x4b0

but task is already holding lock:
ffff8880271e6d58 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x153/0x4b0

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

16 locks held by syz.2.417/7647:
 #0: ffff8881140651e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x12e/0xb50
 #1: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x2c0
 #2: ffff8881272c50d8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: __pte_offset_map_lock+0x13e/0x210
 #3: ffffc900001e0be0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0
 #4: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x208/0x1400
 #5: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #6: ffffffff8e13f140 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #7: ffffffff8e13f140 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #8: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: bond_start_xmit+0x101/0x1a90
 #9: ffffffff8e13f140 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #10: ffff888031cc5258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+...}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70
 #11: ffff8880271e6d58 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x153/0x4b0
 #12: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x452/0x1160
 #13: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x23/0x270
 #14: ffffffff8e13f140 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #15: ffff888111240258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+...}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70

stack backtrace:
CPU: 1 UID: 0 PID: 7647 Comm: syz.2.417 Not tainted 6.16.0-rc6-syzkaller-00135-gcf074eca0065 #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:
 <IRQ>
 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
 sch_direct_xmit+0x153/0x4b0
 __dev_queue_xmit+0x17b6/0x3a70
 NF_HOOK+0x310/0x3a0
 arp_xmit+0x16c/0x270
 arp_solicit+0xc1d/0xe60
 __neigh_event_send+0xf70/0x1560
 neigh_resolve_output+0x198/0x750
 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
 vlan_dev_hard_start_xmit+0x346/0x5e0
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1adf/0x3a70
 ip6_finish_output2+0x11fe/0x16a0
 ndisc_send_skb+0xb47/0x1400
 addrconf_rs_timer+0x369/0x670
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:unmap_page_range+0x1ea3/0x41c0
Code: 8b 1b 48 89 de 48 83 e6 01 31 ff e8 f7 9e b7 ff 48 83 e3 01 4c 8b a4 24 a0 00 00 00 0f 85 7d 21 00 00 4c 8b 7c 24 48 4c 89 ff <be> 08 00 00 00 e8 e3 ad 19 00 48 8b 84 24 20 01 00 00 42 80 3c 28
RSP: 0018:ffffc90004fbf3a0 EFLAGS: 00000246
RAX: ffffffff82088ed9 RBX: 0000000000000000 RCX: ffff8880303a8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00007e40c0
RBP: ffffc90004fbf650 R08: ffffea00007e40f3 R09: 1ffffd40000fc81e
R10: dffffc0000000000 R11: fffff940000fc81f R12: 00007f616e75d000
R13: dffffc0000000000 R14: ffff888033b4ea00 R15: ffffea00007e40c0
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x22e0
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f616f78e9a9
Code: Unable to access opcode bytes at 0x7f616f78e97f.
RSP: 002b:00007f617060c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f616f9b6088 RCX: 00007f616f78e9a9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f616f9b6088
RBP: 00007f616f9b6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f616f9b608c
R13: 0000000000000000 R14: 00007ffcc0289bc0 R15: 00007ffcc0289ca8
 </TASK>
