------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 kernel/workqueue.c:4919
WARNING: CPU: 1 PID: 7973 at lib/debugobjects.c:325 debug_print_object+0x168/0x250 lib/debugobjects.c:325
IPVS: ftp: loaded support on port[0] = 21
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7973 Comm: kworker/u4:5 Not tainted 4.19.57 #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
IPVS: ftp: loaded support on port[0] = 21
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x263/0x507 kernel/panic.c:185
kobject: 'lo' (00000000eadf3ba9): kobject_add_internal: parent: 'net', set: 'devices'
kobject: 'lo' (00000000eadf3ba9): kobject_uevent_env
kobject: 'lo' (00000000eadf3ba9): fill_kobj_path: path = '/devices/virtual/net/lo'
 __warn.cold+0x20/0x4a kernel/panic.c:540
kobject: 'queues' (0000000025af240d): kobject_add_internal: parent: 'lo', set: '<NULL>'
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
kobject: 'queues' (0000000025af240d): kobject_uevent_env
kobject: 'queues' (0000000025af240d): kobject_uevent_env: filter function caused the event to drop!
kobject: 'rx-0' (0000000051944e67): kobject_add_internal: parent: 'queues', set: 'queues'
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1013
kobject: 'rx-0' (0000000051944e67): kobject_uevent_env
RIP: 0010:debug_print_object+0x168/0x250 lib/debugobjects.c:325
Code: dd a0 c0 81 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd a0 c0 81 87 48 c7 c7 40 b6 81 87 e8 b6 46 1a fe <0f> 0b 83 05 7b 4c 17 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3
RSP: 0018:ffff888080027838 EFLAGS: 00010086
kobject: 'rx-0' (0000000051944e67): fill_kobj_path: path = '/devices/virtual/net/lo/queues/rx-0'
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8155b1c6 RDI: ffffed1010004ef9
RBP: ffff888080027878 R08: ffff8880a509e240 R09: ffffed1015d23ee3
R10: ffffed1015d23ee2 R11: ffff8880ae91f717 R12: 0000000000000001
R13: ffffffff887aa9c0 R14: ffffffff815b2070 R15: ffff888076f227e0
kobject: 'tx-0' (0000000038474d60): kobject_add_internal: parent: 'queues', set: 'queues'
kobject: 'tx-0' (0000000038474d60): kobject_uevent_env
 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline]
 debug_check_no_obj_freed+0x29f/0x464 lib/debugobjects.c:817
kobject: 'tx-0' (0000000038474d60): fill_kobj_path: path = '/devices/virtual/net/lo/queues/tx-0'
 kfree+0xbd/0x220 mm/slab.c:3821
 kvfree+0x61/0x70 mm/util.c:452
 netdev_freemem+0x4c/0x60 net/core/dev.c:8897
 netdev_release+0x86/0xb0 net/core/net-sysfs.c:1645
kobject: 'lo' (00000000537b1dd3): kobject_add_internal: parent: 'net', set: 'devices'
 device_release+0x7b/0x210 drivers/base/core.c:891
 kobject_cleanup lib/kobject.c:662 [inline]
 kobject_release lib/kobject.c:691 [inline]
 kref_put include/linux/kref.h:70 [inline]
 kobject_put.cold+0x289/0x2e6 lib/kobject.c:708
 netdev_run_todo+0x53b/0x7c0 net/core/dev.c:8802
kobject: 'lo' (00000000537b1dd3): kobject_uevent_env
kobject: 'lo' (00000000537b1dd3): fill_kobj_path: path = '/devices/virtual/net/lo'
 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117
kobject: 'queues' (00000000a9183652): kobject_add_internal: parent: 'lo', set: '<NULL>'
 default_device_exit_batch+0x358/0x410 net/core/dev.c:9583
kobject: 'queues' (00000000a9183652): kobject_uevent_env
kobject: 'queues' (00000000a9183652): kobject_uevent_env: filter function caused the event to drop!
kobject: 'rx-0' (00000000200fc493): kobject_add_internal: parent: 'queues', set: 'queues'
 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:156
kobject: 'rx-0' (00000000200fc493): kobject_uevent_env
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:552
kobject: 'rx-0' (00000000200fc493): fill_kobj_path: path = '/devices/virtual/net/lo/queues/rx-0'
 process_one_work+0x989/0x1750 kernel/workqueue.c:2153
kobject: 'tx-0' (0000000020368695): kobject_add_internal: parent: 'queues', set: 'queues'
 worker_thread+0x98/0xe40 kernel/workqueue.c:2296
kobject: 'tx-0' (0000000020368695): kobject_uevent_env
kobject: 'tx-0' (0000000020368695): fill_kobj_path: path = '/devices/virtual/net/lo/queues/tx-0'
 kthread+0x354/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
kobject: 'tunl0' (00000000d367fc90): kobject_add_internal: parent: 'net', set: 'devices'

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