------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: batadv_dat_purge+0x0/0x400 net/batman-adv/distributed-arp-table.c:1815
WARNING: CPU: 1 PID: 8 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline]
WARNING: CPU: 1 PID: 8 at lib/debugobjects.c:505 __debug_check_no_obj_freed lib/debugobjects.c:989 [inline]
WARNING: CPU: 1 PID: 8 at lib/debugobjects.c:505 debug_check_no_obj_freed+0x455/0x610 lib/debugobjects.c:1020
Modules linked in:
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.19.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
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+0x455/0x610 lib/debugobjects.c:1020
Code: 74 08 48 89 ef e8 4b 7f fa fd 48 8b 13 4c 8b 45 00 48 c7 c7 c0 ec 16 8a 48 c7 c6 80 e9 16 8a 44 89 f1 4d 89 f9 e8 db c3 86 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 38 ff 05 90 de 33
RSP: 0018:ffffc900000d7788 EFLAGS: 00010246
RAX: c14e2d1b7fd01b00 RBX: ffffffff8a16ed38 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff8a16e4c0 RDI: 0000000000000001
RBP: ffffffff89cbffa0 R08: dffffc0000000000 R09: ffffed10173a69d9
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff89cbffa0
R13: ffff88801eed8e90 R14: 0000000000000000 R15: ffffffff8938c210
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2cfcd63423 CR3: 0000000068451000 CR4: 00000000003506e0
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+0xcd/0x1a0 mm/slub.c:1780
 slab_free mm/slub.c:3536 [inline]
 kfree+0xfc/0x310 mm/slub.c:4584
 device_release+0x91/0x190
 kobject_cleanup lib/kobject.c:673 [inline]
 kobject_release lib/kobject.c:704 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1cd/0x3a0 lib/kobject.c:721
 netdev_run_todo+0xc6a/0xd20 net/core/dev.c:10366
 default_device_exit_batch+0x3db/0x540 net/core/dev.c:11338
 ops_exit_list net/core/net_namespace.c:167 [inline]
 cleanup_net+0x6d4/0xa20 net/core/net_namespace.c:594
 process_one_work+0x7b9/0xef0 kernel/workqueue.c:2289
 worker_thread+0x8c9/0xfd0 kernel/workqueue.c:2436
 kthread+0x232/0x2b0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30
 </TASK>