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.
set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3634 at arch/x86/kvm/x86.c:11171 kvm_arch_vcpu_ioctl_run+0xd39/0x12b0
Modules linked in:
CPU: 0 PID: 3634 Comm: syz-executor299 Not tainted 6.1.0-rc5-syzkaller-00307-gfe24a97cf254 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:kvm_arch_vcpu_ioctl_run+0xd39/0x12b0 arch/x86/kvm/x86.c:11171
Code: 7c 00 89 5c 24 10 85 db 7e 43 e8 82 28 7c 00 4c 8b 7c 24 38 e9 ae fa ff ff e8 73 28 7c 00 0f 0b e9 70 fa ff ff e8 67 28 7c 00 <0f> 0b e9 96 fa ff ff e8 5b 28 7c 00 e9 f8 fa ff ff e8 51 28 7c 00
RSP: 0018:ffffc90003c4fc98 EFLAGS: 00010293
RAX: ffffffff81106bb9 RBX: 0000000000000001 RCX: ffff888025ecba80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81106649 R09: fffffbfff20e8642
R10: fffffbfff20e8642 R11: 1ffffffff20e8641 R12: dffffc0000000000
R13: ffff888017e96000 R14: ffff888076a60000 R15: ffff888076a600d8
FS:  00005555574c3300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000073877000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x7ef/0xcf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4065
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f651888e079
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:00007ffd15b60748 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007f651888e079
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f6518852220 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f65188522b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>