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/mmu.c:3416!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8988 Comm: syz-executor185 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:transparent_hugepage_adjust+0x4c8/0x550 arch/x86/kvm/mmu/mmu.c:3416
Code: ff ff e8 eb 5d 5e 00 48 8b 45 b8 48 83 e8 01 48 89 45 c8 e9 a3 fd ff ff 48 89 df e8 c2 f8 9b 00 e9 7b fb ff ff e8 c8 5d 5e 00 <0f> 0b 48 8b 7d c8 e8 ad f8 9b 00 e9 ba fc ff ff 49 8d 7f 30 e8 7f
RSP: 0018:ffffc90001ef7728 EFLAGS: 00010293
RAX: ffff888093348340 RBX: ffffc90001ef7818 RCX: ffffffff8116cc87
RDX: 0000000000000000 RSI: ffffffff8116cdc8 RDI: 0000000000000007
RBP: ffffc90001ef7770 R08: ffff888093348340 R09: ffffed101161d682
R10: ffffed101161d681 R11: ffff88808b0eb40b R12: 0000000000000063
R13: 00000000000a8863 R14: 00000000000a8861 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a2a80000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tdp_page_fault+0x580/0x6a0 arch/x86/kvm/mmu/mmu.c:4315
 kvm_mmu_page_fault+0x1dd/0x1800 arch/x86/kvm/mmu/mmu.c:5539
 handle_ept_violation+0x259/0x560 arch/x86/kvm/vmx/vmx.c:5163
 vmx_handle_exit+0x29f/0x1730 arch/x86/kvm/vmx/vmx.c:5921
 vcpu_enter_guest+0x334f/0x6110 arch/x86/kvm/x86.c:8290
 vcpu_run arch/x86/kvm/x86.c:8354 [inline]
 kvm_arch_vcpu_ioctl_run+0x430/0x17b0 arch/x86/kvm/x86.c:8561
 kvm_vcpu_ioctl+0x4dc/0xfc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2847
 kvm_vcpu_compat_ioctl+0x1c4/0x3a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3043
 __do_compat_sys_ioctl fs/compat_ioctl.c:214 [inline]
 __se_compat_sys_ioctl fs/compat_ioctl.c:142 [inline]
 __ia32_compat_sys_ioctl+0x233/0x610 fs/compat_ioctl.c:142
 do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
 do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f79a39
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:00000000ffc4c58c EFLAGS: 00000286 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000000ae80
RDX: 0000000000000000 RSI: 00000000080ea0a8 RDI: 00000000ffc4c5e0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace a40eff2544dcf0dd ]---
RIP: 0010:transparent_hugepage_adjust+0x4c8/0x550 arch/x86/kvm/mmu/mmu.c:3416
Code: ff ff e8 eb 5d 5e 00 48 8b 45 b8 48 83 e8 01 48 89 45 c8 e9 a3 fd ff ff 48 89 df e8 c2 f8 9b 00 e9 7b fb ff ff e8 c8 5d 5e 00 <0f> 0b 48 8b 7d c8 e8 ad f8 9b 00 e9 ba fc ff ff 49 8d 7f 30 e8 7f
RSP: 0018:ffffc90001ef7728 EFLAGS: 00010293
RAX: ffff888093348340 RBX: ffffc90001ef7818 RCX: ffffffff8116cc87
RDX: 0000000000000000 RSI: ffffffff8116cdc8 RDI: 0000000000000007
RBP: ffffc90001ef7770 R08: ffff888093348340 R09: ffffed101161d682
R10: ffffed101161d681 R11: ffff88808b0eb40b R12: 0000000000000063
R13: 00000000000a8863 R14: 00000000000a8861 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a2a80000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400