BUG: kernel NULL pointer dereference, address: 0000000000000004
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 43489067 P4D 43489067 PUD 9417d067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 17592 Comm: syz-executor.2 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:update_pvclock_gtod arch/x86/kvm/x86.c:1750 [inline]
RIP: 0010:pvclock_gtod_notify+0x243/0x570 arch/x86/kvm/x86.c:7466
Code: 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 38 48 8d 7d 4c 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 00 77 00 <00> 08 84 d2 0f 85 73 02 00 00 8b 45 4c 48 8d 7b 48 48 89 fa 48 c1
RSP: 0018:ffffc90000007bf0 EFLAGS: 00010002
RAX: 0000000000000004 RBX: ffffffff8d440980 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff89f7718c
RBP: ffffffff89f77140 R08: 0000000000000000 R09: ffffffff8d0c0a1f
R10: fffffbfff1a18143 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff89f02dc0
FS:  00007fdee0f9a700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000044673000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 update_pvclock_gtod kernel/time/timekeeping.c:581 [inline]
 timekeeping_update+0x28a/0x4a0 kernel/time/timekeeping.c:675
 timekeeping_advance+0x6ad/0xa40 kernel/time/timekeeping.c:2122
 tick_do_update_jiffies64.part.0+0x1ec/0x330 kernel/time/tick-sched.c:101
 tick_do_update_jiffies64 kernel/time/tick-sched.c:64 [inline]
 tick_sched_do_timer kernel/time/tick-sched.c:147 [inline]
 tick_sched_timer+0x236/0x2a0 kernel/time/tick-sched.c:1321
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x147/0x5f0 arch/x86/kernel/apic/apic.c:1097
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 f8 6b fc 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 46 92 d3 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 6b 1b 28 f9 65 8b 05 b4 24 d9 77 85 c0 74 02 5d
RSP: 0018:ffffc900063d7678 EFLAGS: 00000282
RAX: 1ffffffff13f8d7f RBX: ffff88804bdc23c0 RCX: ffffffff815b7ef2
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8880ae435e00 R08: 0000000000000001 R09: ffffffff8d0c0aef
R10: fffffbfff1a1815d R11: 0000000000000000 R12: ffff8880ae435e00
R13: ffff8880870160c0 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3517 [inline]
 finish_task_switch+0x150/0x790 kernel/sched/core.c:3617
 context_switch kernel/sched/core.c:3781 [inline]
 __schedule+0xed1/0x2280 kernel/sched/core.c:4527
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:4683
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
 __local_bh_enable_ip+0x1a0/0x1f0 kernel/softirq.c:202
 rxrpc_recvmsg+0x6fb/0x1a2c net/rxrpc/recvmsg.c:602
 sock_recvmsg_nosec net/socket.c:885 [inline]
 ____sys_recvmsg+0x561/0x640 net/socket.c:2574
 ___sys_recvmsg+0x127/0x200 net/socket.c:2618
 do_recvmmsg+0x24d/0x6d0 net/socket.c:2716
 __sys_recvmmsg net/socket.c:2795 [inline]
 __do_sys_recvmmsg net/socket.c:2818 [inline]
 __se_sys_recvmmsg net/socket.c:2811 [inline]
 __x64_sys_recvmmsg+0x20b/0x260 net/socket.c:2811
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45dd99
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdee0f99c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 0000000000027000 RCX: 000000000045dd99
RDX: 04000000000005cd RSI: 0000000020000800 RDI: 0000000000000004
RBP: 000000000118bf70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000042 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffc96c51b1f R14: 00007fdee0f9a9c0 R15: 000000000118bf2c
Modules linked in:
CR2: 0000000000000004
---[ end trace e11cf143b6eb33cf ]---
RIP: 0010:update_pvclock_gtod arch/x86/kvm/x86.c:1750 [inline]
RIP: 0010:pvclock_gtod_notify+0x243/0x570 arch/x86/kvm/x86.c:7466
Code: 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 38 48 8d 7d 4c 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 00 77 00 <00> 08 84 d2 0f 85 73 02 00 00 8b 45 4c 48 8d 7b 48 48 89 fa 48 c1
RSP: 0018:ffffc90000007bf0 EFLAGS: 00010002
RAX: 0000000000000004 RBX: ffffffff8d440980 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff89f7718c
RBP: ffffffff89f77140 R08: 0000000000000000 R09: ffffffff8d0c0a1f
R10: fffffbfff1a18143 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff89f02dc0
FS:  00007fdee0f9a700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000044673000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400