------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x80
WARNING: CPU: 1 PID: 55 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline]
WARNING: CPU: 1 PID: 55 at lib/debugobjects.c:508 __debug_check_no_obj_freed lib/debugobjects.c:992 [inline]
WARNING: CPU: 1 PID: 55 at lib/debugobjects.c:508 debug_check_no_obj_freed+0x46b/0x650 lib/debugobjects.c:1023
Modules linked in:
CPU: 1 PID: 55 Comm: kworker/u4:3 Not tainted 5.18.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:992 [inline]
RIP: 0010:debug_check_no_obj_freed+0x46b/0x650 lib/debugobjects.c:1023
Code: 48 89 ef e8 b7 e1 a8 fd 48 8b 13 4c 8b 45 00 48 c7 c7 00 97 e8 8a 48 c7 c6 e0 93 e8 8a 44 89 f1 4d 89 f9 31 c0 e8 75 65 21 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 1f 89 d3 09 48 8b 5c 24
RSP: 0018:ffffc900013df778 EFLAGS: 00010246
RAX: 53d67e2a39429a00 RBX: ffffffff8ae89778 RCX: ffff8880116dd880
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a8eefe0 R08: ffffffff816ad552 R09: ffffed1017366809
R10: ffffed1017366809 R11: 1ffff11017366808 R12: ffff88807cce36dc
R13: ffff88807cce36e8 R14: 0000000000000000 R15: ffffffff81566e90
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb399270900 CR3: 00000000249b4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:1703 [inline]
 slab_free_freelist_hook+0xcf/0x1a0 mm/slub.c:1754
 slab_free mm/slub.c:3510 [inline]
 kfree+0xc6/0x210 mm/slub.c:4552
 device_release+0x98/0x1c0
 kobject_cleanup+0x235/0x470 lib/kobject.c:673
 netdev_run_todo+0xf7c/0x1070 net/core/dev.c:10274
 default_device_exit_batch+0x665/0x6d0 net/core/dev.c:11242
 ops_exit_list net/core/net_namespace.c:167 [inline]
 cleanup_net+0x80c/0xc50 net/core/net_namespace.c:594
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>