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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WARNING: CPU: 0 PID: 7996 at arch/x86/kvm/vmx.c:6387 handle_exception+0x430/0xa30 arch/x86/kvm/vmx.c:6387
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 7996 Comm: syz-executor320 Not tainted 4.14.302-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x44 kernel/panic.c:547
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967
RIP: 0010:handle_exception+0x430/0xa30 arch/x86/kvm/vmx.c:6387
RSP: 0018:ffff88808f32fa58 EFLAGS: 00010297
RAX: ffff8880b32d6180 RBX: 0000000080000b0e RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88808f3c55e0
RBP: ffff88808f3c0040 R08: 0000000000000000 R09: 000000000002057c
R10: ffff8880b32d6a30 R11: ffff8880b32d6180 R12: 0000000020c2c748
R13: 0000000000000000 R14: ffff8880aa662000 R15: 0000000080000300
 vmx_handle_exit+0x1f8/0x14b0 arch/x86/kvm/vmx.c:9250
 vcpu_enter_guest arch/x86/kvm/x86.c:7317 [inline]
 vcpu_run arch/x86/kvm/x86.c:7380 [inline]
 kvm_arch_vcpu_ioctl_run+0x1dc7/0x5c80 arch/x86/kvm/x86.c:7547
 kvm_vcpu_ioctl+0x417/0xca0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2698
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f077258edc9
RSP: 002b:00007fff444cef08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f077258edc9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f07725528c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0772552950
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..