------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x50 kernel/workqueue.c:1612
WARNING: CPU: 0 PID: 4508 at lib/debugobjects.c:505 debug_print_object+0xd2/0xf8 lib/debugobjects.c:505
Modules linked in:
CPU: 0 PID: 4508 Comm: kworker/u4:4 Not tainted 5.12.0-rc2-syzkaller-00467-g0d7588ab9ef9 #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: netns cleanup_net
epc : debug_print_object+0xd2/0xf8 lib/debugobjects.c:505
 ra : debug_print_object+0xd2/0xf8 lib/debugobjects.c:505
epc : ffffffe000ac0002 ra : ffffffe000ac0002 sp : ffffffe0260f3810
 gp : ffffffe005d25728 tp : ffffffe00a31c440 t0 : ffffffe00679db67
 t1 : ffffffc404c1e69e t2 : 0000000000000000 s0 : ffffffe0260f3860
 s1 : 0000000000000000 a0 : 0000000000000061 a1 : 00000000000f0000
 a2 : 0000000000000002 a3 : ffffffe0000d649e a4 : fde268c950607e00
 a5 : fde268c950607e00 a6 : 0000000000f00000 a7 : ffffffe0260f34f7
 s2 : ffffffe004b04818 s3 : ffffffe005d2cc44 s4 : ffffffe004004228
 s5 : ffffffe0048dc728 s6 : ffffffe000062f4a s7 : ffffffe00010df06
 s8 : 0000000000000003 s9 : 0000000000000100 s10: ffffffe006927540
 s11: ffffffe011688d90 t3 : fde268c950607e00 t4 : ffffffc404c1e69d
 t5 : ffffffc404c1e69f t6 : ffffffe0260f34f8
status: 0000000000000120 badaddr: 0000000000000000 cause: 0000000000000003
Call Trace:
[<ffffffe000ac0002>] debug_print_object+0xd2/0xf8 lib/debugobjects.c:505
[<ffffffe000ac1a4e>] __debug_check_no_obj_freed lib/debugobjects.c:987 [inline]
[<ffffffe000ac1a4e>] debug_check_no_obj_freed+0x208/0x23a lib/debugobjects.c:1018
[<ffffffe000392444>] slab_free_hook mm/slub.c:1554 [inline]
[<ffffffe000392444>] slab_free_freelist_hook+0x17a/0x18a mm/slub.c:1600
[<ffffffe000395b40>] slab_free mm/slub.c:3161 [inline]
[<ffffffe000395b40>] kfree+0xd2/0x3d0 mm/slub.c:4213
[<ffffffe0002eb856>] kvfree+0x5e/0x72 mm/util.c:616
[<ffffffe002b5fc3c>] netdev_freemem+0x30/0x3a net/core/dev.c:10619
[<ffffffe002bc49f4>] netdev_release+0x64/0x7c net/core/net-sysfs.c:1875
[<ffffffe0010a3cda>] device_release+0x66/0x148 drivers/base/core.c:2108
[<ffffffe000b90652>] kobject_cleanup lib/kobject.c:705 [inline]
[<ffffffe000b90652>] kobject_release lib/kobject.c:736 [inline]
[<ffffffe000b90652>] kref_put include/linux/kref.h:65 [inline]
[<ffffffe000b90652>] kobject_put+0x1b0/0x37e lib/kobject.c:753
[<ffffffe002b5f966>] netdev_run_todo+0x63a/0x798 net/core/dev.c:10475
[<ffffffe002b770ba>] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:112
[<ffffffe002b489ec>] default_device_exit_batch+0x22c/0x258 net/core/dev.c:11426
[<ffffffe002b276f2>] ops_exit_list+0xb2/0xcc net/core/net_namespace.c:178
[<ffffffe002b29a9e>] cleanup_net+0x3ba/0x6a8 net/core/net_namespace.c:595
[<ffffffe0000609b4>] process_one_work+0x5b0/0xf3a kernel/workqueue.c:2275
[<ffffffe00006168e>] worker_thread+0x350/0x87a kernel/workqueue.c:2421
[<ffffffe00006ef76>] kthread+0x234/0x298 kernel/kthread.c:292
[<ffffffe000005570>] ret_from_exception+0x0/0x14