------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0xa0 kernel/workqueue.c:1555
WARNING: CPU: 0 PID: 5953 at lib/debugobjects.c:505 debug_print_object+0x188/0x264 lib/debugobjects.c:505
Modules linked in:
CPU: 0 PID: 5953 Comm: kworker/u4:2 Not tainted 5.12.0-rc2-syzkaller-00487-gf296bfd5cd04 #0
Hardware name: linux,dummy-virt (DT)
Workqueue: netns cleanup_net
pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
pc : debug_print_object+0x188/0x264 lib/debugobjects.c:505
lr : debug_print_object+0x188/0x264 lib/debugobjects.c:505
sp : ffff00001836f4e0
x29: ffff00001836f4e0 x28: dfff800000000000 
x27: ffff0000146445e8 x26: 0000000000000005 
x25: ffff8000103143b0 x24: ffff800015f53520 
x23: ffff800015c8caa0 x22: 0000000000000003 
x21: ffff800015f52d20 x20: ffff800017d900d8 
x19: ffff0000151b1770 x18: ffff00006a675b48 
x17: 0000000000000000 x16: 0000000000000001 
x15: ffff800018462960 x14: 1fffe0000306ddd2 
x13: 0000000000000001 x12: ffff60000d4ceb84 
x11: 1fffe0000d4ceb83 x10: ffff60000d4ceb83 
x9 : dfff800000000000 x8 : ffff00006a675c1b 
x7 : 0000000000000001 x6 : 00009ffff2b3147d 
x5 : ffff00006a675c18 x4 : 1fffe000017fc339 
x3 : dfff800000000000 x2 : 0000000000000000 
x1 : 0000000000000000 x0 : ffff00000bfe19c0 
Call trace:
 debug_print_object+0x188/0x264 lib/debugobjects.c:505
 __debug_check_no_obj_freed lib/debugobjects.c:987 [inline]
 debug_check_no_obj_freed+0x2e4/0x420 lib/debugobjects.c:1018
 slab_free_hook mm/slub.c:1554 [inline]
 slab_free_freelist_hook+0x1c4/0x260 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0x154/0x7d0 mm/slub.c:4213
 kvfree+0x3c/0x50 mm/util.c:616
 netdev_freemem+0x48/0x60 net/core/dev.c:10619
 netdev_release+0x70/0xa0 net/core/net-sysfs.c:1875
 device_release+0xe4/0x1f0 drivers/base/core.c:2108
 kobject_cleanup lib/kobject.c:705 [inline]
 kobject_release lib/kobject.c:736 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x144/0x460 lib/kobject.c:753
 netdev_run_todo+0x780/0xb10 net/core/dev.c:10475
 rtnl_unlock+0x10/0x20 net/core/rtnetlink.c:112
 default_device_exit_batch+0x234/0x2d0 net/core/dev.c:11426
 ops_exit_list+0xd0/0x124 net/core/net_namespace.c:178
 cleanup_net+0x3a4/0x820 net/core/net_namespace.c:595
 process_one_work+0x798/0x1764 kernel/workqueue.c:2275
 worker_thread+0x3d4/0xcd0 kernel/workqueue.c:2421
 kthread+0x320/0x3bc kernel/kthread.c:292
 ret_from_fork+0x10/0x3c arch/arm64/kernel/entry.S:958