L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html for details.
BUG: unable to handle kernel paging request at ffff8801c5674000
PGD bc01067 P4D bc01067 PUD 1d9bf2063 PMD 80000001c56001e3 
Oops: 000b [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8374 Comm: syz-executor4 Not tainted 4.19.0+ #85
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
kobject: 'kvm' (00000000298cb613): kobject_uevent_env
RIP: 0010:__update_clear_spte_fast include/linux/compiler.h:206 [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:ffff8801bcd3f158 EFLAGS: 00010a06
kobject: 'kvm' (00000000298cb613): fill_kobj_path: path = '/devices/virtual/misc/kvm'
RAX: dffffc0000000000 RBX: 1ffff100379a7e30 RCX: ffffffff8111493b
RDX: 1ffff10038ace800 RSI: ffffffff81114a1b RDI: 0000000000000007
RBP: ffff8801bcd3f228 R08: ffff8801bcc8a1c0 R09: ffffed003b5e5b57
R10: ffffed003b5e5b57 R11: ffff8801daf2dabb R12: 1ffff100379a7e2c
R13: ffff8801c5674000 R14: 0000000000000004 R15: 0000000000000000
FS:  00007fb5cc94b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
kobject: 'kvm' (00000000298cb613): kobject_uevent_env
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801c5674000 CR3: 00000001c9b86000 CR4: 00000000001426e0
Call Trace:
kobject: 'kvm' (00000000298cb613): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 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:5794 [inline]
 kvm_mmu_invalidate_zap_all_pages+0x348/0x7b0 arch/x86/kvm/mmu.c:5835
 kvm_arch_flush_shadow_all+0x15/0x20 arch/x86/kvm/x86.c:9357
 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
 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: 0033:0x457569
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb5cc94ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000020000080 RSI: 000000004040aea0 RDI: 0000000000000005
RBP: 000000000072c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb5cc94b6d4
R13: 00000000004c02b9 R14: 00000000004d03f0 R15: 00000000ffffffff
Modules linked in:
CR2: ffff8801c5674000
---[ end trace 9ab11e8790811a67 ]---
RIP: 0010:__update_clear_spte_fast include/linux/compiler.h:206 [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:ffff8801bcd3f158 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: 1ffff100379a7e30 RCX: ffffffff8111493b
RDX: 1ffff10038ace800 RSI: ffffffff81114a1b RDI: 0000000000000007
RBP: ffff8801bcd3f228 R08: ffff8801bcc8a1c0 R09: ffffed003b5e5b57
R10: ffffed003b5e5b57 R11: ffff8801daf2dabb R12: 1ffff100379a7e2c
R13: ffff8801c5674000 R14: 0000000000000004 R15: 0000000000000000
FS:  00007fb5cc94b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801c5674000 CR3: 00000001c9b86000 CR4: 00000000001426e0