netdevsim netdevsim1 eth3 (unregistering): unset [1, 0] type 2 family 0 port 20004 - 0
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88816ba0c200 object type: work_struct hint: udp_tunnel_nic_device_sync_work+0x0/0xa10
WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x405/0x550, CPU#1: syz.1.2457/15513
Modules linked in:
CPU: 1 UID: 0 PID: 15513 Comm: syz.1.2457 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
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550
Code: 89 44 24 20 e8 27 db 76 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 40 c8 27 8c 48 c7 c2 c0 cd 27 8c 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc9000867ec28 EFLAGS: 00010246
RAX: ffffffff8a350a50 RBX: ffffffff9a4f1650 RCX: 0000000000000000
RDX: ffffffff8c27cdc0 RSI: ffffffff8c27c840 RDI: ffffffff901c67f0
RBP: ffffffff8bcb5f40 R08: ffff88816ba0c200 R09: ffffffff8bcb70c0
R10: dffffc0000000000 R11: ffffffff818e7d30 R12: ffff88816ba0c300
R13: ffffffff901c67f0 R14: ffff88816ba0c000 R15: ffff88816ba0c200
FS:  00007faeed9e46c0(0000) GS:ffff8882a945d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f48728b7ff8 CR3: 0000000022a10000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kfree+0x13a/0x630
 udp_tunnel_nic_netdevice_event+0x11ed/0x17d0
 notifier_call_chain+0x1be/0x400
 unregister_netdevice_many_notify+0x186a/0x2370
 unregister_netdevice_queue+0x31f/0x360
 nsim_destroy+0x1e5/0x680
 __nsim_dev_port_del+0x14d/0x1b0
 nsim_dev_reload_destroy+0x288/0x490
 nsim_dev_reload_down+0x8a/0xc0
 devlink_reload+0x1d1/0x8d0
 devlink_nl_reload_doit+0x9d4/0xc80
 genl_family_rcv_msg_doit+0x22a/0x330
 genl_rcv_msg+0x61c/0x7a0
 netlink_rcv_skb+0x232/0x4b0
 genl_rcv+0x28/0x40
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faeecb9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007faeed9e4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007faeece16180 RCX: 00007faeecb9c799
RDX: 0000000000000030 RSI: 0000200000000100 RDI: 000000000000000a
RBP: 00007faeecc32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faeece16218 R14: 00007faeece16180 R15: 00007ffc6aad0658
 </TASK>
