------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880790814f8 object type: timer_list hint: batadv_dat_purge+0x0/0x490
WARNING: CPU: 0 PID: 5260 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline]
WARNING: CPU: 0 PID: 5260 at lib/debugobjects.c:508 __debug_check_no_obj_freed lib/debugobjects.c:1023 [inline]
WARNING: CPU: 0 PID: 5260 at lib/debugobjects.c:508 debug_check_no_obj_freed+0x488/0x650 lib/debugobjects.c:1054
Modules linked in:
CPU: 0 PID: 5260 Comm: kworker/u4:9 Not tainted 6.4.0-rc4-syzkaller-00268-g51f269a6ecc7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1023 [inline]
RIP: 0010:debug_check_no_obj_freed+0x488/0x650 lib/debugobjects.c:1054
Code: aa fd 49 8b 16 4c 8b 4d 00 48 c7 c7 60 4d 38 8b 48 c7 c6 20 4a 38 8b 8b 0c 24 49 89 d8 ff 74 24 30 e8 bc fe 19 fd 48 83 c4 08 <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 38 ff 05 19 01 1d
RSP: 0018:ffffc9000615f7e0 EFLAGS: 00010292
RAX: e41573217257f300 RBX: ffff8880790814f8 RCX: ffff88807be80000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8aec6a20 R08: ffffffff81530142 R09: fffff52000c2be75
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8aec6a20
R13: ffffffff8aec6a20 R14: ffffffff8b384df8 R15: ffff88802d209e50
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000001ffffff8 CR3: 0000000017f8c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:1756 [inline]
 slab_free_freelist_hook mm/slub.c:1807 [inline]
 slab_free mm/slub.c:3786 [inline]
 __kmem_cache_free+0x20d/0x3c0 mm/slub.c:3799
 device_release+0x95/0x1c0
 kobject_cleanup lib/kobject.c:683 [inline]
 kobject_release lib/kobject.c:714 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x228/0x470 lib/kobject.c:731
 netdev_run_todo+0xe5a/0xf50 net/core/dev.c:10400
 default_device_exit_batch+0x5c9/0x630 net/core/dev.c:11392
 ops_exit_list net/core/net_namespace.c:175 [inline]
 cleanup_net+0x767/0xb80 net/core/net_namespace.c:614
 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2405
 worker_thread+0xa63/0x1210 kernel/workqueue.c:2552
 kthread+0x2b8/0x350 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>