WARNING: CPU: 0 PID: 21008 at net/xfrm/xfrm_state.c:2391 xfrm_state_fini+0x218/0x280 net/xfrm/xfrm_state.c:2391
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 21008 Comm: kworker/u4:3 Not tainted 4.19.37 #5
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:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x263/0x51d kernel/panic.c:185
 __warn.cold+0x20/0x54 kernel/panic.c:540
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:997
RIP: 0010:xfrm_state_fini+0x218/0x280 net/xfrm/xfrm_state.c:2391
Code: 41 5e 5d c3 e8 a9 15 7c fb 0f 0b e9 09 ff ff ff e8 9d 15 7c fb 0f 0b e9 68 ff ff ff e8 91 15 7c fb 0f 0b eb c6 e8 88 15 7c fb <0f> 0b e9 52 fe ff ff e8 1c 77 b2 fb e9 75 fe ff ff e8 32 77 b2 fb
kobject: 'loop2' (00000000f2e57e49): kobject_uevent_env
RSP: 0018:ffff8880a4aa7bd0 EFLAGS: 00010293
RAX: ffff88809ef1c400 RBX: ffff888086454280 RCX: ffffffff85ee2b19
RDX: 0000000000000000 RSI: ffffffff85ef31f8 RDI: 0000000000000005
RBP: ffff8880a4aa7bf0 R08: ffff88809ef1c400 R09: ffff88809ef1ccf0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888086455dc0
R13: ffff8880a4aa7cc8 R14: ffffffff891b7078 R15: dffffc0000000000
 xfrm_net_exit+0x25/0x70 net/xfrm/xfrm_policy.c:2948
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:552
 process_one_work+0x98e/0x1760 kernel/workqueue.c:2153
kobject: 'loop2' (00000000f2e57e49): fill_kobj_path: path = '/devices/virtual/block/loop2'
 worker_thread+0x98/0xe40 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:246
kobject: 'loop4' (0000000094c809d3): kobject_uevent_env
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Kernel Offset: disabled
Rebooting in 86400 seconds..