L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
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kernel BUG at arch/x86/kvm/mmu.c:3324!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8719 Comm: syz-executor309 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:transparent_hugepage_adjust+0x490/0x530 arch/x86/kvm/mmu.c:3324
Code: 63 00 48 8b 45 b8 48 83 e8 01 e9 19 fd ff ff e8 36 3c 63 00 48 8b 45 b8 48 83 e8 01 48 89 45 c8 e9 a1 fd ff ff e8 20 3c 63 00 <0f> 0b 48 89 df e8 86 9e 9e 00 e9 9f fb ff ff 4c 89 ff e8 79 9e 9e
RSP: 0018:ffff8880a978f740 EFLAGS: 00010293
RAX: ffff8880a05083c0 RBX: ffff8880a978f828 RCX: ffffffff810fe787
RDX: 0000000000000000 RSI: ffffffff810fe8c0 RDI: 0000000000000007
RBP: ffff8880a978f788 R08: ffff8880a05083c0 R09: ffffed101248d682
R10: ffffed101248d681 R11: ffff88809246b40b R12: ffff8880a978f818
R13: 0000000000000103 R14: 000000000009a101 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000094bcc000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tdp_page_fault+0x56e/0x650 arch/x86/kvm/mmu.c:4216
 kvm_mmu_page_fault+0x1dd/0x1800 arch/x86/kvm/mmu.c:5439
 handle_ept_violation+0x259/0x560 arch/x86/kvm/vmx/vmx.c:5185
 vmx_handle_exit+0x29f/0x1730 arch/x86/kvm/vmx/vmx.c:5929
 vcpu_enter_guest arch/x86/kvm/x86.c:8227 [inline]
 vcpu_run arch/x86/kvm/x86.c:8291 [inline]
 kvm_arch_vcpu_ioctl_run+0x1cb8/0x70d0 arch/x86/kvm/x86.c:8498
 kvm_vcpu_ioctl+0x4dc/0xfc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2772
 kvm_vcpu_compat_ioctl+0x1c4/0x3a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2968
 __do_compat_sys_ioctl fs/compat_ioctl.c:1049 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:995 [inline]
 __ia32_compat_sys_ioctl+0x195/0x620 fs/compat_ioctl.c:995
 do_syscall_32_irqs_on arch/x86/entry/common.c:333 [inline]
 do_fast_syscall_32+0x27b/0xdb3 arch/x86/entry/common.c:404
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f36a39
Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000ffee523c EFLAGS: 00000217 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000000ae80
RDX: 0000000000000000 RSI: 0000000000000036 RDI: 0000000000000006
RBP: 000000000000ae80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace be4773b2e784e245 ]---
RIP: 0010:transparent_hugepage_adjust+0x490/0x530 arch/x86/kvm/mmu.c:3324
Code: 63 00 48 8b 45 b8 48 83 e8 01 e9 19 fd ff ff e8 36 3c 63 00 48 8b 45 b8 48 83 e8 01 48 89 45 c8 e9 a1 fd ff ff e8 20 3c 63 00 <0f> 0b 48 89 df e8 86 9e 9e 00 e9 9f fb ff ff 4c 89 ff e8 79 9e 9e
RSP: 0018:ffff8880a978f740 EFLAGS: 00010293
RAX: ffff8880a05083c0 RBX: ffff8880a978f828 RCX: ffffffff810fe787
RDX: 0000000000000000 RSI: ffffffff810fe8c0 RDI: 0000000000000007
RBP: ffff8880a978f788 R08: ffff8880a05083c0 R09: ffffed101248d682
R10: ffffed101248d681 R11: ffff88809246b40b R12: ffff8880a978f818
R13: 0000000000000103 R14: 000000000009a101 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000094bcc000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400