bond0 (unregistering): Released all slaves
WARNING: CPU: 1 PID: 88 at net/ipv4/netfilter/ipt_CLUSTERIP.c:835 clusterip_net_exit+0x368/0x3e0 net/ipv4/netfilter/ipt_CLUSTERIP.c:835
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 88 Comm: kworker/u4:3 Not tainted 4.16.0-rc3+ #333
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:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:clusterip_net_exit+0x368/0x3e0 net/ipv4/netfilter/ipt_CLUSTERIP.c:835
RSP: 0018:ffff8801d901f1a8 EFLAGS: 00010293
RAX: ffff8801d9690040 RBX: 1ffff1003b203e36 RCX: ffffffff84e2aaa8
RDX: 0000000000000000 RSI: 1ffff1003b203e0c RDI: ffffed003b203df8
RBP: ffff8801d901f278 R08: 1ffff1003b203d7e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d901f250
R13: 1ffff1003b203e3a R14: ffff8801b28b9380 R15: ffff8801b285e0c0
 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142
 cleanup_net+0x6a1/0xcb0 net/core/net_namespace.c:517
 process_one_work+0xc47/0x1bb0 kernel/workqueue.c:2113
 worker_thread+0x223/0x1990 kernel/workqueue.c:2247
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..