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: CPU: 0 PID: 3537 at arch/x86/kvm/vmx/vmx.c:5163 handle_exception_nmi+0x8f2/0xe10 Modules linked in: CPU: 0 PID: 3537 Comm: syz-executor273 Not tainted 6.1.34-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:handle_exception_nmi+0x8f2/0xe10 arch/x86/kvm/vmx/vmx.c:5163 Code: c4 df 65 00 0f 0b e9 44 f9 ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 7c f7 ff ff e8 98 28 bc 00 e9 72 f7 ff ff e8 9e df 65 00 <0f> 0b e9 53 fc ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 9d f8 ff RSP: 0018:ffffc90003aef490 EFLAGS: 00010293 RAX: ffffffff8123f5b2 RBX: ffff88807bf48000 RCX: ffff888027bb9dc0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff8123f1ff R09: ffffed100f7e904a R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1100f7e901b R13: 0000000000000000 R14: 00000000009d23e2 R15: dffffc0000000000 FS: 00005555566b1300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffaa101fe4 CR3: 0000000078aa3000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6480 [inline] vmx_handle_exit+0xca0/0x1a00 arch/x86/kvm/vmx/vmx.c:6497 vcpu_enter_guest+0x2ad0/0xa570 arch/x86/kvm/x86.c:10920 vcpu_run arch/x86/kvm/x86.c:11023 [inline] kvm_arch_vcpu_ioctl_run+0xf5f/0x20c0 arch/x86/kvm/x86.c:11244 kvm_vcpu_ioctl+0x7f0/0xcf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4091 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: 0033:0x7fb6375843f9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd9d1c0748 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb6375843f9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006 RBP: 00007fb637547ef0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009120 R11: 0000000000000246 R12: 00007fb637547f80 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000