------------[ 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: [] debug_print_object+0xd2/0xf8 lib/debugobjects.c:505 [] __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] [] debug_check_no_obj_freed+0x208/0x23a lib/debugobjects.c:1018 [] slab_free_hook mm/slub.c:1554 [inline] [] slab_free_freelist_hook+0x17a/0x18a mm/slub.c:1600 [] slab_free mm/slub.c:3161 [inline] [] kfree+0xd2/0x3d0 mm/slub.c:4213 [] kvfree+0x5e/0x72 mm/util.c:616 [] netdev_freemem+0x30/0x3a net/core/dev.c:10619 [] netdev_release+0x64/0x7c net/core/net-sysfs.c:1875 [] device_release+0x66/0x148 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+0x1b0/0x37e lib/kobject.c:753 [] netdev_run_todo+0x63a/0x798 net/core/dev.c:10475 [] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:112 [] default_device_exit_batch+0x22c/0x258 net/core/dev.c:11426 [] ops_exit_list+0xb2/0xcc net/core/net_namespace.c:178 [] cleanup_net+0x3ba/0x6a8 net/core/net_namespace.c:595 [] process_one_work+0x5b0/0xf3a kernel/workqueue.c:2275 [] worker_thread+0x350/0x87a kernel/workqueue.c:2421 [] kthread+0x234/0x298 kernel/kthread.c:292 [] ret_from_exception+0x0/0x14