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: 1 PID: 7872 Comm: syz-executor018 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+0x52e/0x530 arch/x86/kvm/mmu.c:3324
Code: e9 a0 fe ff ff 48 8b 4d d0 80 e1 07 80 c1 03 38 c1 0f 8c c2 fe ff ff 48 8b 7d d0 e8 ec 24 9c 00 e9 b4 fe ff ff e8 62 e6 62 00 <0f> 0b 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 50 4d 89 cc
RSP: 0018:ffff88809a1678a0 EFLAGS: 00010293
RAX: ffffffff81106e9e RBX: 0000000000000041 RCX: ffff88809ab0a6c0
RDX: 0000000000000000 RSI: 0000000000000041 RDI: 0000000000000002
RBP: ffff88809a167908 R08: ffffffff81106d76 R09: ffffed101206d682
R10: ffffed101206d682 R11: 0000000000000000 R12: ffff88809a167970
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000095c41
FS:  0000000000f48880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000096ac1000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tdp_page_fault+0x4d3/0xc40 arch/x86/kvm/mmu.c:4216
 kvm_mmu_page_fault+0x180/0xf20 arch/x86/kvm/mmu.c:5439
 handle_ept_violation+0x1c1/0x220 arch/x86/kvm/vmx/vmx.c:5185
 vmx_handle_exit+0x3da/0xe70 arch/x86/kvm/vmx/vmx.c:5929
 vcpu_enter_guest+0x3ffa/0x5530 arch/x86/kvm/x86.c:8227
 vcpu_run+0x393/0xd40 arch/x86/kvm/x86.c:8291
 kvm_arch_vcpu_ioctl_run+0x636/0x900 arch/x86/kvm/x86.c:8498
 kvm_vcpu_ioctl+0x6cf/0xaf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2772
 do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:718
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x443f49
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff04cff758 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443f49
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0
R10: 00000000004002e0 R11: 0000000000000246 R12: 0000000000401c50
R13: 0000000000401ce0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 71e6879f008a1615 ]---
RIP: 0010:transparent_hugepage_adjust+0x52e/0x530 arch/x86/kvm/mmu.c:3324
Code: e9 a0 fe ff ff 48 8b 4d d0 80 e1 07 80 c1 03 38 c1 0f 8c c2 fe ff ff 48 8b 7d d0 e8 ec 24 9c 00 e9 b4 fe ff ff e8 62 e6 62 00 <0f> 0b 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 50 4d 89 cc
RSP: 0018:ffff88809a1678a0 EFLAGS: 00010293
RAX: ffffffff81106e9e RBX: 0000000000000041 RCX: ffff88809ab0a6c0
RDX: 0000000000000000 RSI: 0000000000000041 RDI: 0000000000000002
RBP: ffff88809a167908 R08: ffffffff81106d76 R09: ffffed101206d682
R10: ffffed101206d682 R11: 0000000000000000 R12: ffff88809a167970
R13: dffffc0000000000 R14: 0000000000000002 R15: 0000000000095c41
FS:  0000000000f48880(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000096ac1000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400