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.
kvm: vcpu 1: requested 128 ns lapic timer period limited to 200000 ns
kvm: vcpu 1: requested lapic timer restore with starting count register 0x390=1812281087 (231971979136 ns) > initial count (200000 ns). Using initial count to start timer.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3507 at arch/x86/kvm/x86.c:11182 kvm_arch_vcpu_ioctl_run+0x1f38/0x20c0
Modules linked in:
CPU: 1 PID: 3507 Comm: syz-executor119 Not tainted 6.1.46-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1f38/0x20c0 arch/x86/kvm/x86.c:11182
Code: df e8 5c 0d d0 00 e9 1c ed ff ff 89 e9 80 e1 07 38 c1 0f 8c 26 ed ff ff 48 89 ef e8 42 0d d0 00 e9 19 ed ff ff e8 78 7a 79 00 <0f> 0b e9 3f fa ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 4e f9 ff
RSP: 0018:ffffc900039dfc70 EFLAGS: 00010293
RAX: ffffffff81108388 RBX: 0000000000000000 RCX: ffff88801fa88000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8117dc51 R09: fffffbfff209345e
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888017ac4000
R13: dffffc0000000000 R14: ffff888027a58000 R15: ffff888027a580e8
FS:  0000555555f45380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055599e768d18 CR3: 000000007e14e000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x7f0/0xcf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4121
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f0f0196eff9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcb5f8e528 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffcb5f8e6f8 RCX: 00007f0f0196eff9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f0f019e2610 R08: 00007ffcb5f8e6f8 R09: 00007ffcb5f8e6f8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcb5f8e6e8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>