------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x90 arch/x86/include/asm/paravirt.h:767 WARNING: CPU: 0 PID: 21 at lib/debugobjects.c:325 debug_print_object+0x168/0x250 lib/debugobjects.c:325 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.2.0-rc2+ #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x744 kernel/panic.c:219 __warn.cold+0x20/0x4d kernel/panic.c:576 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986 RIP: 0010:debug_print_object+0x168/0x250 lib/debugobjects.c:325 Code: dd 00 cb a4 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 00 cb a4 87 48 c7 c7 a0 c0 a4 87 e8 e6 6d 0d fe <0f> 0b 83 05 fb 5d 4b 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffff8880a9a0f838 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815ac7e6 RDI: ffffed1015341ef9 RBP: ffff8880a9a0f878 R08: ffff8880a99fe580 R09: ffffed1015d040f1 R10: ffffed1015d040f0 R11: ffff8880ae820787 R12: 0000000000000001 R13: ffffffff88bad160 R14: ffffffff81603830 R15: ffff8880675ae5a0 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline] debug_check_no_obj_freed+0x29f/0x464 lib/debugobjects.c:817 kfree+0xbd/0x220 mm/slab.c:3754 kvfree+0x61/0x70 mm/util.c:460 netdev_freemem+0x4c/0x60 net/core/dev.c:9074 netdev_release+0x86/0xb0 net/core/net-sysfs.c:1639 device_release+0x7a/0x210 drivers/base/core.c:1064 kobject_cleanup lib/kobject.c:691 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:67 [inline] kobject_put.cold+0x289/0x2e6 lib/kobject.c:737 netdev_run_todo+0x53b/0x7c0 net/core/dev.c:8979 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:116 default_device_exit_batch+0x358/0x410 net/core/dev.c:9760 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:157 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:553 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 ======================================================