------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: batadv_dat_purge+0x0/0x4f0
WARNING: CPU: 1 PID: 1086 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline]
WARNING: CPU: 1 PID: 1086 at lib/debugobjects.c:505 __debug_check_no_obj_freed lib/debugobjects.c:989 [inline]
WARNING: CPU: 1 PID: 1086 at lib/debugobjects.c:505 debug_check_no_obj_freed+0x46b/0x650 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 1086 Comm: kworker/u4:5 Not tainted 6.0.0-rc5-syzkaller-00094-ga335366bad13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:502 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:989 [inline]
RIP: 0010:debug_check_no_obj_freed+0x46b/0x650 lib/debugobjects.c:1020
Code: 48 89 ef e8 57 4c a2 fd 48 8b 13 4c 8b 45 00 48 c7 c7 60 71 0a 8b 48 c7 c6 40 6e 0a 8b 44 89 f1 4d 89 f9 31 c0 e8 25 78 16 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 cf e7 ea 09 48 8b 5c 24
RSP: 0018:ffffc90004307788 EFLAGS: 00010246
RAX: 905d99771e9e2100 RBX: ffffffff8b0a71d8 RCX: ffff888020429d80
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8aafc080 R08: ffffffff816d5c8d R09: ffffed10173667f1
R10: ffffed10173667f1 R11: 1ffff110173667f0 R12: ffff8880206d6ebc
R13: ffff8880206d6ec8 R14: 0000000000000000 R15: ffffffff8a120020
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3d1fad8300 CR3: 000000001739c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0xcf/0x1a0 mm/slub.c:1780
 slab_free mm/slub.c:3534 [inline]
 kfree+0xda/0x210 mm/slub.c:4562
 device_release+0x98/0x1c0
 kobject_cleanup+0x235/0x470 lib/kobject.c:673
 netdev_run_todo+0xf9c/0x1090 net/core/dev.c:10385
 default_device_exit_batch+0x665/0x6d0 net/core/dev.c:11357
 ops_exit_list net/core/net_namespace.c:168 [inline]
 cleanup_net+0x80c/0xc50 net/core/net_namespace.c:595
 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>