BUG: unable to handle kernel paging request at ffff8881cdd79000
PGD be01067 P4D be01067 PUD 1d9bfd063 PMD 80000001cdc001e3 
kobject: 'loop4' (00000000d912bbb5): kobject_uevent_env
Oops: 000b [#1] PREEMPT SMP KASAN
CPU: 1 PID: 30346 Comm: syz-executor3 Not tainted 4.20.0-rc6+ #372
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
kobject: 'loop4' (00000000d912bbb5): fill_kobj_path: path = '/devices/virtual/block/loop4'
RSP: 0018:ffff88818557ede8 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: 1ffff11030aafdc2 RCX: ffffc9000be2a000
RDX: 1ffff11039baf200 RSI: ffffffff81114f6b RDI: 0000000000000007
RBP: ffff88818557eeb8 R08: ffff8881d8db8040 R09: ffffed103b5e5b5f
R10: ffffed103b5e5b5f R11: ffff8881daf2dafb R12: 1ffff11030aafdbe
R13: ffff8881cdd79000 R14: 0000000000000004 R15: 0000000000000000
FS:  00007f81bf650700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
kobject: 'loop5' (00000000cb6bee54): kobject_uevent_env
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop5' (00000000cb6bee54): fill_kobj_path: path = '/devices/virtual/block/loop5'
CR2: ffff8881cdd79000 CR3: 00000001b2f63000 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
 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
 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
 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
 get_signal+0x1558/0x1980 kernel/signal.c:2347
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 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: 0033:0x4574e7
Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f81bf64e098 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000000000018 RCX: 00000000004574e7
RDX: 00007f81bf64e6f0 RSI: 000000008138ae83 RDI: 0000000000000006
RBP: 0000000020017000 R08: 00007f81bf64e0a0 R09: 000000000072bf00
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000fec00000
R13: 00000000ffffffff R14: 00000000004d9a48 R15: 00000000ffffffff
Modules linked in:
CR2: ffff8881cdd79000
---[ end trace 28dd5910ded85529 ]---
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:ffff88818557ede8 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: 1ffff11030aafdc2 RCX: ffffc9000be2a000
RDX: 1ffff11039baf200 RSI: ffffffff81114f6b RDI: 0000000000000007
RBP: ffff88818557eeb8 R08: ffff8881d8db8040 R09: ffffed103b5e5b5f
R10: ffffed103b5e5b5f R11: ffff8881daf2dafb R12: 1ffff11030aafdbe
R13: ffff8881cdd79000 R14: 0000000000000004 R15: 0000000000000000
FS:  00007f81bf650700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881cdd79000 CR3: 00000001b2f63000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400