IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 kernel/workqueue.c:4850 IPv6: ADDRCONF(NETDEV_UP): vxcan0: link is not ready ------------[ cut here ]------------ IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready WARNING: CPU: 0 PID: 2308 at lib/debugobjects.c:287 debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 2308 Comm: kworker/u4:3 Not tainted 4.14.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready Call Trace: 8021q: adding VLAN 0 to HW filter on device batadv0 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x142/0x197 lib/dump_stack.c:58 panic+0x1f9/0x42d kernel/panic.c:183 __warn.cold+0x2f/0x2f kernel/panic.c:547 kobject: 'vlan0' (ffff888097f5a100): kobject_add_internal: parent: 'mesh', set: '' report_bug+0x216/0x254 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] fixup_bug arch/x86/kernel/traps.c:172 [inline] do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:debug_print_object.cold+0xa7/0xdb lib/debugobjects.c:287 RSP: 0018:ffff8880a190f860 EFLAGS: 00010082 RAX: 0000000000000061 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87040e40 RDI: ffffed1014321f02 RBP: ffff8880a190f888 R08: 0000000000000061 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a18fa340 R12: ffffffff86cbf760 R13: ffffffff813d9630 R14: 0000000000000000 R15: ffff88809f861880 __debug_check_no_obj_freed lib/debugobjects.c:747 [inline] debug_check_no_obj_freed+0x3f5/0x7b7 lib/debugobjects.c:776 kfree+0xbd/0x270 mm/slab.c:3814 kvfree+0x4d/0x60 mm/util.c:416 netdev_freemem+0x4c/0x60 net/core/dev.c:8039 netdev_release+0x72/0x90 net/core/net-sysfs.c:1497 device_release+0x163/0x1a0 drivers/base/core.c:825 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x269/0x2f9 lib/kobject.c:692 netdev_run_todo+0x4e4/0x770 net/core/dev.c:7944 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:106 default_device_exit_batch+0x328/0x3d0 net/core/dev.c:8730 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:145 cleanup_net+0x3ba/0x870 net/core/net_namespace.c:484 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 ======================================================