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: 1 PID: 6785 at arch/x86/kvm/x86.c:618 kvm_inject_emulated_page_fault+0x1b6/0x230 arch/x86/kvm/x86.c:618
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6785 Comm: syz-executor816 Not tainted 5.7.0-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+0x1e9/0x30e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:221
 __warn+0x209/0x210 kernel/panic.c:582
 report_bug+0x1ac/0x2d0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:105 [inline]
 do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:197
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:216
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:kvm_inject_emulated_page_fault+0x1b6/0x230 arch/x86/kvm/x86.c:618
Code: 04 07 84 c0 75 7c 8a 03 0f b6 d8 31 ff 89 de e8 90 a6 6a 00 89 d8 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 fa a3 6a 00 <0f> 0b e9 94 fe ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 67 fe ff ff 4c
RSP: 0018:ffffc900015b7920 EFLAGS: 00010293
RAX: ffffffff810a0d86 RBX: 0000000000000000 RCX: ffff8880a7912140
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000e
RBP: dffffc0000000000 R08: ffffffff810a0c13 R09: ffffffff81bb83dd
R10: ffff8880a7912140 R11: 0000000000000003 R12: ffffc900015b7960
R13: dffffc0000000000 R14: ffff8880a834c040 R15: ffff8880a834c040
 nested_vmx_get_vmptr+0x191/0x1d0 arch/x86/kvm/vmx/nested.c:4638
 handle_vmon+0x173/0x4a0 arch/x86/kvm/vmx/nested.c:4767
 vcpu_enter_guest+0x6666/0x89a0 arch/x86/kvm/x86.c:8604
 vcpu_run+0x352/0xcd0 arch/x86/kvm/x86.c:8669
 kvm_arch_vcpu_ioctl_run+0x451/0x8f0 arch/x86/kvm/x86.c:8890
 kvm_vcpu_ioctl+0x64f/0xa60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3163
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:771 [inline]
 __do_sys_ioctl fs/ioctl.c:780 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:778
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x443569
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 1b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff155345e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff155345f0 RCX: 0000000000443569
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000020003800 R09: 0000000000400eb0
R10: 00007fff15532a50 R11: 0000000000000246 R12: 0000000000404610
R13: 00000000004046a0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..