veth1_vlan: left promiscuous mode
veth0_vlan: left promiscuous mode
------------[ cut here ]------------
debug_locks && !(lock_is_held(&(&n->tbl->lock)->dep_map) != 0)
WARNING: net/core/neighbour.c:154 at neigh_mark_dead+0x2fb/0x340 net/core/neighbour.c:154, CPU#1: kworker/u8:0/12
Modules linked in:
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: netns cleanup_net
RIP: 0010:neigh_mark_dead+0x2fb/0x340 net/core/neighbour.c:154
Code: e8 03 42 80 3c 28 00 74 08 48 89 df e8 4e 40 6c f8 4c 89 33 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 56 47 fa f7 90 <0f> 0b 90 e9 8f fd ff ff 48 c7 c1 d0 d9 bc 90 80 e1 07 80 c1 03 38
RSP: 0018:ffffc900001170a0 EFLAGS: 00010293
RAX: ffffffff89cee6ba RBX: ffff888059471000 RCX: ffff88801dae8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000022e0c R12: ffff88805947113c
R13: dffffc0000000000 R14: ffff888059471020 R15: ffff888059471000
FS:  0000000000000000(0000) GS:ffff888124722000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f26c95556c8 CR3: 000000007eccc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 neigh_flush_one+0x27c/0x5a0 net/core/neighbour.c:388
 neigh_flush_dev net/core/neighbour.c:432 [inline]
 __neigh_ifdown+0x1fb/0xc70 net/core/neighbour.c:465
 neigh_ifdown+0x1f/0x30 net/core/neighbour.c:487
 rt6_disable_ip+0x751/0x7e0 net/ipv6/route.c:5058
 addrconf_ifdown+0x155/0x1ad0 net/ipv6/addrconf.c:3892
 addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:86
 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline]
 call_netdevice_notifiers net/core/dev.c:2327 [inline]
 netif_close_many+0x463/0x660 net/core/dev.c:1829
 unregister_netdevice_many_notify+0xb76/0x2140 net/core/dev.c:12498
 unregister_netdevice_many net/core/dev.c:12600 [inline]
 default_device_exit_batch+0x6cf/0x760 net/core/dev.c:13312
 ops_exit_list net/core/net_namespace.c:206 [inline]
 ops_undo_list+0x4d7/0x8f0 net/core/net_namespace.c:253
 cleanup_net+0x572/0x810 net/core/net_namespace.c:706
 process_one_work kernel/workqueue.c:3495 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>