------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x80 WARNING: CPU: 0 PID: 1172 at lib/debugobjects.c:515 debug_print_object lib/debugobjects.c:512 [inline] WARNING: CPU: 0 PID: 1172 at lib/debugobjects.c:515 __debug_check_no_obj_freed lib/debugobjects.c:999 [inline] WARNING: CPU: 0 PID: 1172 at lib/debugobjects.c:515 debug_check_no_obj_freed+0x451/0x610 lib/debugobjects.c:1030 Modules linked in: CPU: 0 PID: 1172 Comm: kworker/u4:5 Not tainted 5.15.103-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: netns cleanup_net RIP: 0010:debug_print_object lib/debugobjects.c:512 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:999 [inline] RIP: 0010:debug_check_no_obj_freed+0x451/0x610 lib/debugobjects.c:1030 Code: 74 08 48 89 ef e8 4f 2e b8 fd 48 8b 13 4c 8b 45 00 48 c7 c7 60 c2 d8 8a 48 c7 c6 20 bf d8 8a 44 89 f1 4d 89 f9 e8 df 3a 3a fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 38 ff 05 44 e8 d1 RSP: 0018:ffffc90004d57758 EFLAGS: 00010246 RAX: 3eacea528fff1500 RBX: ffffffff8ad8c2d8 RCX: ffff88801ce50000 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffffff8a8c8060 R08: ffffffff8166a76c R09: ffffed10173467a0 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8a8c8060 R13: ffff888026722bb8 R14: 0000000000000000 R15: ffffffff8152cac0 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2b53ec8270 CR3: 000000002528b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: slab_free_hook mm/slub.c:1680 [inline] slab_free_freelist_hook+0x86/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0x115/0x2e0 mm/slub.c:4559 device_release+0x91/0x1c0 kobject_cleanup lib/kobject.c:713 [inline] kobject_release lib/kobject.c:744 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x224/0x460 lib/kobject.c:761 netdev_run_todo+0xaaf/0xc40 net/core/dev.c:10633 default_device_exit_batch+0x395/0x3f0 net/core/dev.c:11595 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x763/0xb60 net/core/net_namespace.c:596 process_one_work+0x90d/0x1270 kernel/workqueue.c:2306 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298