============================================
WARNING: possible recursive locking detected
6.16.0-syzkaller-12063-g37816488247d #0 Not tainted
--------------------------------------------
syz.2.11977/32756 is trying to acquire lock:
ffff888110ae5218 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+.-.}-{3:3}, at: __dev_queue_xmit+0x22b7/0x3b50

but task is already holding lock:
ffff888107f57258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+.-.}-{3:3}, at: __dev_queue_xmit+0x138a/0x3b50

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

       CPU0
       ----
  lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3);
  lock(dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

12 locks held by syz.2.11977/32756:
 #0: ffff888106b081e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x12e/0xb50
 #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x250
 #2: ffff88810f2dac18 (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: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x20c/0x1440
 #5: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #6: ffffffff8e139f40 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27b/0x3b50
 #7: ffff888107f57258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+.-.}-{3:3}, at: __dev_queue_xmit+0x138a/0x3b50
 #8: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ip_output+0x60/0x3c0
 #9: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x452/0x1160
 #10: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x23/0x270
 #11: ffffffff8e139f40 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27b/0x3b50

stack backtrace:
CPU: 1 UID: 0 PID: 32756 Comm: syz.2.11977 Not tainted 6.16.0-syzkaller-12063-g37816488247d #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
 __dev_queue_xmit+0x22b7/0x3b50
 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
 ip_output+0x2a1/0x3c0
 iptunnel_xmit+0x592/0xa40
 ip_tunnel_xmit+0x1c41/0x2390
 gre_tap_xmit+0x590/0x7a0
 dev_hard_start_xmit+0x2d7/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x1857/0x3b50
 ip6_finish_output2+0x11bc/0x16a0
 ndisc_send_skb+0xb54/0x1440
 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+0xf49/0x4370
Code: a0 00 00 00 48 8d 58 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 6a d5 19 00 4c 8b 33 <4c> 89 f6 48 83 e6 01 31 ff e8 99 6f b6 ff 4c 89 f0 48 83 e0 01 4c
RSP: 0018:ffffc90007a173a0 EFLAGS: 00000246
RAX: 1ffffd4000855bb9 RBX: ffffea00042addc8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000012a3f RDI: 000000000010ab77
RBP: ffffc90007a17650 R08: ffffea00043885f3 R09: 1ffffd40008710be
R10: dffffc0000000000 R11: fffff940008710bf R12: 00007f54ee5ff000
R13: 00007f54ee535000 R14: 0000000000000000 R15: ffff888106b08000
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 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: 0033:0x7f54ee78ebe9
Code: Unable to access opcode bytes at 0x7f54ee78ebbf.
RSP: 002b:00007f54ef584038 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: 0000000000000000 RBX: 00007f54ee9b6180 RCX: 00007f54ee78ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f54ee811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000c9100120 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f54ee9b6218 R14: 00007f54ee9b6180 R15: 00007fff2dd81ba8
 </TASK>
ip6_tunnel: ip6tnl3 xmit: Local address not yet configured!
