ODEBUG: free active (active state 0) object: ffff88806c67d4f8 object type: timer_list hint: batadv_dat_purge+0x0/0x70 net/batman-adv/distributed-arp-table.c:171 WARNING: CPU: 1 PID: 5105 at lib/debugobjects.c:505 debug_print_object+0x194/0x2c0 lib/debugobjects.c:505 Modules linked in: CPU: 1 PID: 5105 Comm: kworker/u4:6 Not tainted 6.4.0-rc3-syzkaller-00707-g25085b4e9251 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: netns cleanup_net RIP: 0010:debug_print_object+0x194/0x2c0 lib/debugobjects.c:505 Code: df 48 89 fe 48 c1 ee 03 80 3c 16 00 0f 85 c7 00 00 00 48 8b 14 dd 80 29 a7 8a 50 4c 89 ee 48 c7 c7 40 1d a7 8a e8 bc 7c 34 fd <0f> 0b 58 83 05 e6 50 63 0a 01 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e RSP: 0018:ffffc9000568f860 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff8880186d8000 RSI: ffffffff814c03e7 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8a4ed280 R13: ffffffff8aa723a0 R14: ffff888061089130 R15: ffffffff8172bb90 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd767bfff8 CR3: 000000000c571000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1012 [inline] debug_check_no_obj_freed+0x305/0x420 lib/debugobjects.c:1043 slab_free_hook mm/slub.c:1756 [inline] slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3799 kvfree+0x46/0x50 mm/util.c:650 device_release+0xa3/0x240 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:683 [inline] kobject_release lib/kobject.c:714 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:731 netdev_run_todo+0x762/0x1100 net/core/dev.c:10403 default_device_exit_batch+0x456/0x5b0 net/core/dev.c:11395 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308