IPVS: ftp: loaded support on port[0] = 21
------------[ cut here ]------------
ODEBUG: free active (active state 1) object type: rcu_head hint:           (null)
WARNING: CPU: 1 PID: 0 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.0-rc7-next-20181010+ #91
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x3ab lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326
Code: 41 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 00 07 41 88 4c 89 fe 48 c7 c7 a0 fc 40 88 e8 a6 e0 b3 fd <0f> 0b 83 05 19 dc 5e 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffff8801d9b07748 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8164bc15 RDI: 0000000000000005
RBP: ffff8801d9b07788 R08: ffff8801d9af2340 R09: ffffed003b5e3eda
R10: ffffed003b5e3eda R11: ffff8801daf1f6d7 R12: 0000000000000001
R13: ffffffff8939a4e0 R14: 0000000000000000 R15: ffffffff88410140
 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline]
 debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818
 kmem_cache_free+0x202/0x290 mm/slab.c:3759
 free_task_struct kernel/fork.c:163 [inline]
 free_task+0x16e/0x1f0 kernel/fork.c:457
 __put_task_struct+0x2e6/0x620 kernel/fork.c:730
 put_task_struct include/linux/sched/task.h:96 [inline]
 finish_task_switch+0x66c/0x900 kernel/sched/core.c:2715
 context_switch kernel/sched/core.c:2834 [inline]
 __schedule+0x8d7/0x21d0 kernel/sched/core.c:3480
 schedule_idle+0x45/0x80 kernel/sched/core.c:3551
 do_idle+0x36e/0x5c0 kernel/sched/idle.c:286
 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
 start_secondary+0x487/0x5f0 arch/x86/kernel/smpboot.c:271
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Kernel Offset: disabled
Rebooting in 86400 seconds..