------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x80
WARNING: CPU: 1 PID: 478 at lib/debugobjects.c:515 debug_print_object lib/debugobjects.c:512 [inline]
WARNING: CPU: 1 PID: 478 at lib/debugobjects.c:515 __debug_check_no_obj_freed lib/debugobjects.c:999 [inline]
WARNING: CPU: 1 PID: 478 at lib/debugobjects.c:515 debug_check_no_obj_freed+0x451/0x610 lib/debugobjects.c:1030
Modules linked in:
CPU: 0 PID: 478 Comm: kworker/u4:3 Not tainted 5.15.104-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 72 be fd 48 8b 13 4c 8b 45 00 48 c7 c7 20 5a d8 8a 48 c7 c6 e0 56 d8 8a 44 89 f1 4d 89 f9 e8 3f 0f 41 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 38 ff 05 94 bd d8
RSP: 0018:ffffc9000320f758 EFLAGS: 00010246
RAX: 6deabc7ead907600 RBX: ffffffff8ad85a98 RCX: ffff888019b2ba00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8a8c70a0 R08: ffffffff8166101c R09: ffffed10173667a0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8a8c70a0
R13: ffff88805bfe18e0 R14: 0000000000000000 R15: ffffffff81524fe0
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3172da37f0 CR3: 000000005e4d1000 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+0xf1/0x270 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+0x8a1/0x10c0 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>