------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: timer_list hint: batadv_dat_purge+0x0/0x70 net/batman-adv/distributed-arp-table.c:171 WARNING: CPU: 0 PID: 33 at lib/debugobjects.c:502 debug_print_object+0x16e/0x250 lib/debugobjects.c:502 Modules linked in: CPU: 0 PID: 33 Comm: kworker/u4:2 Not tainted 6.1.0-rc7-syzkaller-01833-ga2220b54589b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: netns cleanup_net RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:502 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 40 55 a6 8a 4c 89 ee 48 c7 c7 20 49 a6 8a e8 8a 10 9f 05 <0f> 0b 83 05 45 58 47 0a 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0000:ffffc90000aa7870 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff888017d61d40 RSI: ffffffff816576cc RDI: fffff52000154f00 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: ffffffff8a4e9bc0 R13: ffffffff8aa64e00 R14: ffffffff816ece80 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555557329708 CR3: 0000000078c9c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:989 [inline] debug_check_no_obj_freed+0x305/0x420 lib/debugobjects.c:1020 slab_free_hook mm/slub.c:1699 [inline] slab_free_freelist_hook+0xeb/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3674 kvfree+0x46/0x50 mm/util.c:627 device_release+0xa3/0x240 drivers/base/core.c:2330 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:721 netdev_run_todo+0x762/0x1100 net/core/dev.c:10360 default_device_exit_batch+0x456/0x590 net/core/dev.c:11349 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306