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.
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WARNING: CPU: 0 PID: 3602 at arch/x86/kvm/x86.c:11101 kvm_arch_vcpu_ioctl_run+0x24d6/0x2b90 arch/x86/kvm/x86.c:11101
Modules linked in:
CPU: 0 PID: 3602 Comm: syz-executor145 Not tainted 6.1.0-rc1-next-20221020-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x24d6/0x2b90 arch/x86/kvm/x86.c:11101
Code: e8 7f b1 b6 00 e9 83 dd ff ff 48 8b 7c 24 28 e8 00 b1 b6 00 e9 b8 dc ff ff e8 26 26 6a 00 0f 0b e9 02 e0 ff ff e8 1a 26 6a 00 <0f> 0b e9 3a e0 ff ff e8 0e 26 6a 00 be 08 00 00 00 65 48 8b 1c 25
RSP: 0018:ffffc90003bbfca8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880202d57c0 RSI: ffffffff81125fc6 RDI: 0000000000000005
RBP: ffff888054c20000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000008c001 R12: 0000000000000000
R13: ffffc90003c1b470 R14: ffff88801df748c0 R15: ffff888054c202ec
FS:  0000555556248300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000075bbf000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x570/0xfc0 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 fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc2569c1079
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:00007ffde980cd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007fc2569c1079
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fc256985220 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2569852b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>