BUG: unable to handle kernel paging request at ffff8881b51e6000
PGD be01067 P4D be01067 PUD 1b90fe063 PMD 80000001b50001e3 
Oops: 000b [#1] PREEMPT SMP KASAN
CPU: 1 PID: 27087 Comm: syz-executor0 Not tainted 4.20.0-rc5+ #144
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__update_clear_spte_fast include/linux/compiler.h:209 [inline]
RIP: 0010:mmu_spte_clear_no_track arch/x86/kvm/mmu.c:819 [inline]
RIP: 0010:drop_parent_pte arch/x86/kvm/mmu.c:2004 [inline]
RIP: 0010:mmu_page_zap_pte+0x29e/0x3a0 arch/x86/kvm/mmu.c:2582
Code: 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c7 85 58 ff ff ff 00 00 00 00 48 c1 ea 03 80 3c 02 00 0f 85 d4 00 00 00 48 c1 eb 03 <49> c7 45 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 be 01 00
RSP: 0018:ffff88817dfaf158 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: 1ffff1102fbf5e30 RCX: ffffffff81114e8b
RDX: 1ffff11036a3cc00 RSI: ffffffff81114f6b RDI: 0000000000000007
RBP: ffff88817dfaf228 R08: ffff8881bddf8180 R09: ffffed103b5e5b5f
kobject: 'kvm' (000000005d4aad1b): kobject_uevent_env
R10: ffffed103b5e5b5f R11: ffff8881daf2dafb R12: 1ffff1102fbf5e2c
kobject: 'kvm' (000000005d4aad1b): fill_kobj_path: path = '/devices/virtual/misc/kvm'
R13: ffff8881b51e6000 R14: 0000000000000004 R15: 0000000000000000
FS:  0000000001d76940(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881b51e6000 CR3: 00000001d6b61000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kvm_mmu_page_unlink_children arch/x86/kvm/mmu.c:2599 [inline]
 kvm_mmu_prepare_zap_page+0x215/0x1850 arch/x86/kvm/mmu.c:2643
kobject: 'loop1' (000000001897dcc8): kobject_uevent_env
kobject: 'loop1' (000000001897dcc8): fill_kobj_path: path = '/devices/virtual/block/loop1'
 kvm_zap_obsolete_pages arch/x86/kvm/mmu.c:5785 [inline]
 kvm_mmu_invalidate_zap_all_pages+0x348/0x7b0 arch/x86/kvm/mmu.c:5826
 kvm_arch_flush_shadow_all+0x15/0x20 arch/x86/kvm/x86.c:9359
 kvm_mmu_notifier_release+0x59/0x90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:495
 mmu_notifier_unregister+0x1fa/0x600 mm/mmu_notifier.c:365
kobject: 'kvm' (000000005d4aad1b): kobject_uevent_env
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:745 [inline]
 kvm_put_kvm+0x6c0/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:770
kobject: 'kvm' (000000005d4aad1b): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2413
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffec8600150 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000731ce8 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffec8600080 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000002e0 R15: 0000000000000000
Modules linked in:
CR2: ffff8881b51e6000
---[ end trace cd4f4e17caf4d950 ]---
RIP: 0010:__update_clear_spte_fast include/linux/compiler.h:209 [inline]
RIP: 0010:mmu_spte_clear_no_track arch/x86/kvm/mmu.c:819 [inline]
RIP: 0010:drop_parent_pte arch/x86/kvm/mmu.c:2004 [inline]
RIP: 0010:mmu_page_zap_pte+0x29e/0x3a0 arch/x86/kvm/mmu.c:2582
Code: 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c7 85 58 ff ff ff 00 00 00 00 48 c1 ea 03 80 3c 02 00 0f 85 d4 00 00 00 48 c1 eb 03 <49> c7 45 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 be 01 00
kobject: 'kvm' (000000005d4aad1b): kobject_uevent_env
RSP: 0018:ffff88817dfaf158 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: 1ffff1102fbf5e30 RCX: ffffffff81114e8b
RDX: 1ffff11036a3cc00 RSI: ffffffff81114f6b RDI: 0000000000000007
RBP: ffff88817dfaf228 R08: ffff8881bddf8180 R09: ffffed103b5e5b5f
R10: ffffed103b5e5b5f R11: ffff8881daf2dafb R12: 1ffff1102fbf5e2c
R13: ffff8881b51e6000 R14: 0000000000000004 R15: 0000000000000000
FS:  0000000001d76940(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881b51e6000 CR3: 00000001d6b61000 CR4: 00000000001426e0
kobject: 'kvm' (000000005d4aad1b): fill_kobj_path: path = '/devices/virtual/misc/kvm'
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400