IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
random: nonblocking pool is initialized
------------[ cut here ]------------
WARNING: CPU: 0 PID: 422 at net/xfrm/xfrm_state.c:2131 xfrm_state_fini+0x297/0x330 net/xfrm/xfrm_state.c:2131()
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 422 Comm: kworker/u4:3 Not tainted 4.4.125-g38f41ec #21
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
 0000000000000000 8a64dfc2e22729bf ffff8801d8d07948 ffffffff81d067bd
 ffffffff83843c60 ffff8801d8d07a20 ffffffff83d0a9e0 0000000000000009
 0000000000000853 ffff8801d8d07a10 ffffffff8141b46a 0000000041b58ab3
Call Trace:
 [<ffffffff81d067bd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d067bd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8141b46a>] panic+0x1aa/0x388 kernel/panic.c:112
 [<ffffffff8112db65>] warn_slowpath_common+0x125/0x140 kernel/panic.c:455
 [<ffffffff8112ddc9>] warn_slowpath_null+0x29/0x30 kernel/panic.c:492
 [<ffffffff832c9d57>] xfrm_state_fini+0x297/0x330 net/xfrm/xfrm_state.c:2131
 [<ffffffff832a501d>] xfrm_net_exit+0x2d/0x30 net/xfrm/xfrm_policy.c:3033
 [<ffffffff82e3089e>] ops_exit_list.isra.4+0xae/0x150 net/core/net_namespace.c:134
 [<ffffffff82e3384d>] cleanup_net+0x31d/0x5f0 net/core/net_namespace.c:433
 [<ffffffff811800f7>] process_one_work+0x7d7/0x16e0 kernel/workqueue.c:2064
 [<ffffffff811810d9>] worker_thread+0xd9/0xfc0 kernel/workqueue.c:2196
 [<ffffffff81190b48>] kthread+0x268/0x300 kernel/kthread.c:211
 [<ffffffff83779d95>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..