kvm_intel: 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.
------------[ cut here ]------------
WARNING: arch/x86/kvm/lapic.c:3501 at kvm_apic_accept_events+0x341/0x490 arch/x86/kvm/lapic.c:3501, CPU#0: syz.0.17/6468
Modules linked in:
CPU: 0 UID: 0 PID: 6468 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:kvm_apic_accept_events+0x341/0x490 arch/x86/kvm/lapic.c:3501
Code: eb 0c e8 d2 cb 72 00 eb 05 e8 cb cb 72 00 45 31 ff 44 89 f8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 b0 cb 72 00 90 <0f> 0b 90 e9 ec fd ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 4f
RSP: 0018:ffffc900030d7bf0 EFLAGS: 00010293
RAX: ffffffff814f2cb0 RBX: 0000000000000002 RCX: ffff8880355b5b80
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 0000000000000000 R08: ffffffff81476932 R09: ffff888033d15838
R10: dffffc0000000000 R11: ffffed100f5e0008 R12: 0000000000000002
R13: dffffc0000000000 R14: ffff888072eaba00 R15: ffff88807af002d8
FS:  00007fe5d6f536c0(0000) GS:ffff8881259dc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5d6f51b18 CR3: 000000007e17a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kvm_arch_vcpu_ioctl_get_mpstate+0x115/0x450 arch/x86/kvm/x86.c:12175
 kvm_vcpu_ioctl+0x663/0xed0 virt/kvm/kvm_main.c:4561
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe5d618f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe5d6f53038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe5d63e5fa0 RCX: 00007fe5d618f749
RDX: 0000000000000000 RSI: 000000008004ae98 RDI: 0000000000000005
RBP: 00007fe5d6213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe5d63e6038 R14: 00007fe5d63e5fa0 R15: 00007fff4ecf3b18
 </TASK>