netdevsim netdevsim1 eth3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888112d0ce00 object type: work_struct hint: udp_tunnel_nic_device_sync_work+0x0/0xa10
WARNING: lib/debugobjects.c:615 at debug_check_no_obj_freed+0x405/0x550, CPU#0: syz.1.1330/10910
Modules linked in:
CPU: 0 UID: 0 PID: 10910 Comm: syz.1.1330 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 57 e8 86 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 a0 97 e0 8b 48 c7 c2 c0 9c e0 8b 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:ffffc90008fcebf8 EFLAGS: 00010246
RAX: ffffffff8a043cb0 RBX: ffffffff99f166c0 RCX: 0000000000000000
RDX: ffffffff8be09cc0 RSI: ffffffff8be097a0 RDI: ffffffff8fccb700
RBP: ffffffff8b8a03c0 R08: ffff888112d0ce00 R09: ffffffff8b8a0f80
R10: dffffc0000000000 R11: ffffffff818cd5f0 R12: ffff888112d0cf00
R13: ffffffff8fccb700 R14: ffff888112d0c000 R15: ffff888112d0ce00
FS:  00007f75f88da6c0(0000) GS:ffff88818e41f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f56c5986100 CR3: 000000016b994000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 kfree+0x139/0x650
 udp_tunnel_nic_netdevice_event+0x11ed/0x17d0
 notifier_call_chain+0x19d/0x3a0
 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+0x1d1/0x8e0
 devlink_nl_reload_doit+0xaaa/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
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x4d7/0x810
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0xf0/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75f799acb9
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:00007f75f88da028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f75f7c06090 RCX: 00007f75f799acb9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000010
RBP: 00007f75f7a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f75f7c06128 R14: 00007f75f7c06090 R15: 00007ffc7c3423d8
 </TASK>
