------------[ cut here ]------------ WARNING: CPU: 1 PID: 5038 at net/xfrm/xfrm_policy.c:3057 xfrm_policy_fini+0x26f/0x2f0 net/xfrm/xfrm_policy.c:3057 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5038 Comm: kworker/u4:23 Not tainted 4.9.135+ #65 Workqueue: netns cleanup_net ffff8801c947f928 ffffffff81b42b89 ffffffff82a38ba0 00000000ffffffff 0000000000000000 0000000000000001 0000000000000bf1 ffff8801c947f9e8 ffffffff813f6aa5 0000000041b58ab3 ffffffff82e2b1c3 ffffffff813f68e6 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bf/0x39f kernel/panic.c:179 [] __warn.cold.9+0xc1/0x17f kernel/panic.c:542 [] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [] xfrm_policy_fini+0x26f/0x2f0 net/xfrm/xfrm_policy.c:3057 [] xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:3118 [] ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:136 [] cleanup_net+0x3f2/0x8b0 net/core/net_namespace.c:473 [] process_one_work+0x831/0x1530 kernel/workqueue.c:2092 [] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Kernel Offset: disabled Rebooting in 86400 seconds..