------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x80
WARNING: CPU: 0 PID: 1172 at lib/debugobjects.c:515 debug_print_object lib/debugobjects.c:512 [inline]
WARNING: CPU: 0 PID: 1172 at lib/debugobjects.c:515 __debug_check_no_obj_freed lib/debugobjects.c:999 [inline]
WARNING: CPU: 0 PID: 1172 at lib/debugobjects.c:515 debug_check_no_obj_freed+0x451/0x610 lib/debugobjects.c:1030
Modules linked in:
CPU: 0 PID: 1172 Comm: kworker/u4:5 Not tainted 5.15.103-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:512 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:999 [inline]
RIP: 0010:debug_check_no_obj_freed+0x451/0x610 lib/debugobjects.c:1030
Code: 74 08 48 89 ef e8 4f 2e b8 fd 48 8b 13 4c 8b 45 00 48 c7 c7 60 c2 d8 8a 48 c7 c6 20 bf d8 8a 44 89 f1 4d 89 f9 e8 df 3a 3a fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 38 ff 05 44 e8 d1
RSP: 0018:ffffc90004d57758 EFLAGS: 00010246
RAX: 3eacea528fff1500 RBX: ffffffff8ad8c2d8 RCX: ffff88801ce50000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a8c8060 R08: ffffffff8166a76c R09: ffffed10173467a0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8a8c8060
R13: ffff888026722bb8 R14: 0000000000000000 R15: ffffffff8152cac0
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2b53ec8270 CR3: 000000002528b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:1680 [inline]
 slab_free_freelist_hook+0x86/0x160 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kfree+0x115/0x2e0 mm/slub.c:4559
 device_release+0x91/0x1c0
 kobject_cleanup lib/kobject.c:713 [inline]
 kobject_release lib/kobject.c:744 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x224/0x460 lib/kobject.c:761
 netdev_run_todo+0xaaf/0xc40 net/core/dev.c:10633
 default_device_exit_batch+0x395/0x3f0 net/core/dev.c:11595
 ops_exit_list net/core/net_namespace.c:174 [inline]
 cleanup_net+0x763/0xb60 net/core/net_namespace.c:596
 process_one_work+0x90d/0x1270 kernel/workqueue.c:2306
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>