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.
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WARNING: CPU: 0 PID: 8408 at arch/x86/kvm/x86.c:618 kvm_inject_emulated_page_fault+0x1b8/0x230 arch/x86/kvm/x86.c:629
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8408 Comm: syz-executor.1 Not tainted 5.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x128/0x182 lib/dump_stack.c:118
 panic+0x22a/0x4e3 kernel/panic.c:221
 __warn.cold.10+0x25/0x26 kernel/panic.c:582
 report_bug+0x1ad/0x270 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 do_error_trap+0x123/0x210 arch/x86/kernel/traps.c:267
 do_invalid_op+0x31/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:kvm_inject_emulated_page_fault+0x1b8/0x230 arch/x86/kvm/x86.c:618
Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 74 48 8b 53 08 4c 89 ee 4c 89 e7 e8 bd ef 09 00 e9 1f ff ff ff <0f> 0b e9 79 fe ff ff 48 89 ef e8 b9 d7 92 00 e9 97 fe ff ff 48 89
RSP: 0018:ffffc90004497940 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc900044979d0 RCX: 0000000000000008
RDX: 1ffff92000892f3a RSI: ffffc900044979d0 RDI: ffff88809f574040
RBP: ffff88809f574040 R08: fffff52000892f55 R09: fffff52000892f55
R10: ffffc90004497aa7 R11: fffff52000892f54 R12: ffff88809f574040
R13: ffffc900044979d0 R14: ffff88809f574078 R15: ffff88809f574040
 nested_vmx_get_vmptr+0x136/0x150 arch/x86/kvm/vmx/nested.c:4563
 handle_vmon+0x119/0x2d0 arch/x86/kvm/vmx/nested.c:4692
 vcpu_enter_guest arch/x86/kvm/x86.c:8484 [inline]
 vcpu_run arch/x86/kvm/x86.c:8547 [inline]
 kvm_arch_vcpu_ioctl_run+0x2ab7/0x55c0 arch/x86/kvm/x86.c:8769
 kvm_vcpu_ioctl+0x41b/0xaf0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3138
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0xb8/0x110 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6a/0xb0 fs/ioctl.c:770
 do_syscall_64+0xc6/0x620 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca69
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7b64502c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e8000 RCX: 000000000045ca69
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000003c6 R14: 00000000004c6743 R15: 00007f7b645036d4
Kernel Offset: disabled
Rebooting in 86400 seconds..