------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888021165478 object type: timer_list hint: batadv_dat_purge+0x0/0x490
WARNING: CPU: 0 PID: 1109 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline]
WARNING: CPU: 0 PID: 1109 at lib/debugobjects.c:508 __debug_check_no_obj_freed lib/debugobjects.c:1012 [inline]
WARNING: CPU: 0 PID: 1109 at lib/debugobjects.c:508 debug_check_no_obj_freed+0x488/0x650 lib/debugobjects.c:1043
Modules linked in:
CPU: 0 PID: 1109 Comm: kworker/u4:6 Not tainted 6.4.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1012 [inline]
RIP: 0010:debug_check_no_obj_freed+0x488/0x650 lib/debugobjects.c:1043
Code: a6 fd 49 8b 16 4c 8b 4d 00 48 c7 c7 40 a8 38 8b 48 c7 c6 60 a5 38 8b 8b 0c 24 49 89 d8 ff 74 24 30 e8 3c eb 16 fd 48 83 c4 08 <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 38 ff 05 49 51 1a
RSP: 0018:ffffc90005bef7e0 EFLAGS: 00010292
RAX: e4e370a1cb099800 RBX: ffff888021165478 RCX: ffff888020f49dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8aec4560 R08: ffffffff81521bb2 R09: fffff52000b7de75
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8aec4560
R13: ffffffff8aec4560 R14: ffffffff8b38a8d8 R15: ffff8880716290c0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f105c1df068 CR3: 000000001f6c0000 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+0x185/0x330 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+0xe3a/0xf30 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+0x767/0xb70 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>