INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xe9/0x14b lib/dump_stack.c:53
 register_lock_class+0x164/0x5d0 kernel/locking/lockdep.c:752
 __lock_acquire+0xb4/0x1430 kernel/locking/lockdep.c:3314
 lock_acquire+0xbf/0x220 kernel/locking/lockdep.c:3914
 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
 _raw_read_lock+0x2d/0x40 kernel/locking/spinlock.c:216
 xfrm_policy_timer+0x31/0x330 net/xfrm/xfrm_policy.c:190
 call_timer_fn+0x9f/0x3f0 kernel/time/timer.c:1320
 expire_timers kernel/time/timer.c:1357 [inline]
 __run_timers kernel/time/timer.c:1660 [inline]
 run_timer_softirq+0x68a/0x830 kernel/time/timer.c:1686
 __do_softirq+0xcb/0x4f3 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0xd4/0xe0 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:540 [inline]
 smp_apic_timer_interrupt+0x8e/0x2a0 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:920
 </IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffffc90000cc7e98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: ffff8802169b2300 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8802169b2300 RSI: 0000000000000001 RDI: ffff8802169b2300
RBP: ffffc90000cc7e98 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff8304f960 R14: 0000000000000000 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
 default_idle+0x2e/0x1a0 arch/x86/kernel/process.c:354
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
 default_idle_call+0x1e/0x40 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x17e/0x220 kernel/sched/idle.c:246
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
 start_secondary+0x139/0x180 arch/x86/kernel/smpboot.c:276
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
BUG: unable to handle kernel paging request at 0000000000001458
IP: __read_once_size include/linux/compiler.h:183 [inline]
IP: xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1027 [inline]
IP: xfrm_exp_policy_notify net/xfrm/xfrm_user.c:2993 [inline]
IP: xfrm_send_policy_notify+0x2a5/0x7a0 net/xfrm/xfrm_user.c:3102
PGD 1e53e5067 P4D 1e53e5067 PUD 1e3d42067 PMD 0 
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1027 [inline]
RIP: 0010:xfrm_exp_policy_notify net/xfrm/xfrm_user.c:2993 [inline]
RIP: 0010:xfrm_send_policy_notify+0x2a5/0x7a0 net/xfrm/xfrm_user.c:3102
RSP: 0018:ffff88021fd03d30 EFLAGS: 00010206
RAX: ffff8802169b2300 RBX: ffff880216a62400 RCX: ffffffff82235315
RDX: 0000000000000100 RSI: ffff8801e2613810 RDI: ffff8801e26138b8
RBP: ffff88021fd03d78 R08: 00000000000000b0 R09: ffff8801e26138c0
R10: ffff88021fd03d10 R11: 0000000000000000 R12: ffff8801e2613800
R13: ffff8801e2512000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000001458 CR3: 00000001e68f8000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000004
DR3: 4000000000000007 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 km_policy_notify+0x97/0x180 net/xfrm/xfrm_state.c:1907
 km_policy_expired+0x3e/0x50 net/xfrm/xfrm_state.c:1979
 xfrm_policy_timer+0x2cd/0x330 net/xfrm/xfrm_policy.c:235
 call_timer_fn+0x9f/0x3f0 kernel/time/timer.c:1320
 expire_timers kernel/time/timer.c:1357 [inline]
 __run_timers kernel/time/timer.c:1660 [inline]
 run_timer_softirq+0x68a/0x830 kernel/time/timer.c:1686
 __do_softirq+0xcb/0x4f3 kernel/softirq.c:285
 invoke_softirq kernel/softirq.c:365 [inline]
 irq_exit+0xd4/0xe0 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:540 [inline]
 smp_apic_timer_interrupt+0x8e/0x2a0 arch/x86/kernel/apic/apic.c:1052
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:920
 </IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffffc90000cc7e98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: ffff8802169b2300 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8802169b2300 RSI: 0000000000000001 RDI: ffff8802169b2300
RBP: ffffc90000cc7e98 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff8304f960 R14: 0000000000000000 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
 default_idle+0x2e/0x1a0 arch/x86/kernel/process.c:354
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
 default_idle_call+0x1e/0x40 kernel/sched/idle.c:98
 cpuidle_idle_call kernel/sched/idle.c:156 [inline]
 do_idle+0x17e/0x220 kernel/sched/idle.c:246
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
 start_secondary+0x139/0x180 arch/x86/kernel/smpboot.c:276
 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 50 08 ff 8b 45 d0 85 c0 41 0f 95 84 24 b8 00 00 00 41 8b 85 c0 00 00 00 49 03 85 c8 00 00 00 4c 29 e0 41 89 04 24 e8 2b 50 08 ff <49> 8b 9f 58 14 00 00 e8 9f 80 01 ff 85 c0 74 12 e8 16 50 08 ff 
RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff88021fd03d30
RIP: xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1027 [inline] RSP: ffff88021fd03d30
RIP: xfrm_exp_policy_notify net/xfrm/xfrm_user.c:2993 [inline] RSP: ffff88021fd03d30
RIP: xfrm_send_policy_notify+0x2a5/0x7a0 net/xfrm/xfrm_user.c:3102 RSP: ffff88021fd03d30
CR2: 0000000000001458
---[ end trace f04f07a368110ced ]---