============================================
WARNING: possible recursive locking detected
6.16.0-rc3-syzkaller-00159-g223e2288f4b8 #0 Not tainted
--------------------------------------------
syz-executor/11039 is trying to acquire lock:
ffff88802977af30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220

but task is already holding lock:
ffff888026fb4f30
 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220

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

       CPU0
       ----
  lock(&hsr->seqnr_lock);
  lock(&hsr->seqnr_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

13 locks held by syz-executor/11039:
 #0: ffffffff8e13ee60 (rcu_read_lock
){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390
 #1: ffffc900001e0be0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0
 #2: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x208/0x1400
 #3: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #4: ffffffff8e13eec0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #5: ffff888026fb4f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220
 #6: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: hsr_forward_skb+0x9e/0x2860
 #7: ffffffff8e13eec0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #8: ffff8881069d0258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#3){+...}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70
 #9: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #10: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x208/0x1400
 #11: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #12: ffffffff8e13eec0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70

stack backtrace:
CPU: 1 UID: 0 PID: 11039 Comm: syz-executor Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8 #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_bh+0x36/0x50
 hsr_dev_xmit+0x19a/0x220
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1adf/0x3a70
 ip6_finish_output2+0x11fe/0x16a0
 ip6_finish_output+0x234/0x7d0
 ndisc_send_skb+0xb47/0x1400
 ndisc_solicit+0x444/0x610
 __neigh_event_send+0xf70/0x1560
 neigh_resolve_output+0x198/0x750
 ip6_finish_output2+0x11fe/0x16a0
 ip6_finish_output+0x234/0x7d0
 ip6tunnel_xmit+0x1a6/0x3a0
 ip6_tnl_xmit+0x2254/0x2b00
 __gre6_xmit+0xa47/0xd40
 ip6gre_tunnel_xmit+0xb1f/0x10e0
 dev_hard_start_xmit+0x2d7/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x17b6/0x3a70
 hsr_forward_skb+0x158b/0x2860
 hsr_dev_xmit+0x1a5/0x220
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1adf/0x3a70
 ip6_finish_output2+0x11fe/0x16a0
 ip6_finish_output+0x234/0x7d0
 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:rcu_is_watching+0x5a/0xb0
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 cc be 7c 00 48 c7 c3 58 2f 9e 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 34 8b 03 65 ff 0d a9 ec f5 10 74 11 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc9000a3bf2b0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff888136632f58 RCX: d921c1bd47733500
RDX: ffffc9000a3bf401 RSI: ffffffff8be28d20 RDI: ffffffff8be28ce0
RBP: dffffc0000000000 R08: ffffc9000a3bff48 R09: 0000000000000000
R10: ffffc9000a3bf458 R11: fffff52001477e8d R12: ffffc9000a3bff58
R13: ffffffff81728af5 R14: ffffffff8dba7c68 R15: dffffc0000000000
 lock_release+0x4b/0x3e0
 unwind_next_frame+0x19a9/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 kmalloc_reserve+0xbd/0x290
 __alloc_skb+0x142/0x2d0
 netlink_ack+0x146/0xa50
 netlink_rcv_skb+0x28c/0x470
 netlink_unicast+0x75b/0x8d0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 __sys_sendto+0x3bd/0x520
 __x64_sys_sendto+0xde/0x100
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75f39907bc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffeac19e8d0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f75f46e4620 RCX: 00007f75f39907bc
RDX: 000000000000002c RSI: 00007f75f46e4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffeac19e924 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f75f46e4670 R15: 0000000000000000
 </TASK>
