Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 1306 Comm: kworker/u4:5 Not tainted 4.14.0+ #99 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+0x194/0x257 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:177 fixup_bug arch/x86/kernel/traps.c:246 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:926 RIP: 0010:xfrm_state_fini+0x46a/0x620 net/xfrm/xfrm_state.c:2323 RSP: 0018:ffff8801d2e870f0 EFLAGS: 00010293 RAX: ffff8801d2e7c540 RBX: ffff8801cdcb6040 RCX: ffffffff846010fa RDX: 0000000000000000 RSI: 1ffff1003a5cf9c9 RDI: ffffed003a5d0e10 RBP: ffff8801d2e87248 R08: 1ffff1003a5d0da4 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff1003a5d0e20 R13: ffff8801d2e87220 R14: 1ffff1003a5d0e24 R15: ffff8801cdcb7500 xfrm_net_exit+0x25/0x30 net/xfrm/xfrm_policy.c:2957 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:484 process_one_work+0xbfd/0x1be0 kernel/workqueue.c:2112 worker_thread+0x223/0x1990 kernel/workqueue.c:2246 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:437 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..